Updated on 2023/02/05

写真a

 
KANO Naoki
 
Organization
Academic Assembly Institute of Science and Technology SEISAN DESIGN KOUGAKU KEIRETU Associate Professor
Graduate School of Science and Technology Advanced Materials Science and Technology Associate Professor
Faculty of Engineering Department of Engineering Associate Professor
Title
Associate Professor
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Degree

  • 博士(理学) ( 1995.6   東京大学 )

  • 理学修士 ( 1991.3   東京大学 )

  • 理学士 ( 1989.3   東京大学 )

Research Areas

  • Nanotechnology/Materials / Green sustainable chemistry and environmental chemistry

  • Environmental Science/Agriculture Science / Radiation influence

  • Environmental Science/Agriculture Science / Chemical substance influence on environment

  • Nanotechnology/Materials / Analytical chemistry

  • Environmental Science/Agriculture Science / Environmental load reduction and remediation

  • Environmental Science/Agriculture Science / Environmental dynamic analysis

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Research History (researchmap)

  • Niigata University   Faculty of Engineering Department of Engineering   Associate Professor

    2017.4

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  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Associate Professor

    2007.4

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  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Associate Professor

    2007.4

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  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Associate Professor

    2007.4

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  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Associate Professor

    2007.4

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  • Niigata University   Faculty of Engineering Department of Chemistry and Chemical Engineering   Associate Professor

    2007.4 - 2017.3

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  • Niigata University   Faculty of Engineering   Associate Professor (as old post name)

    2000.4 - 2007.3

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  • Niigata University   Faculty of Engineering   Research Assistant

    1997.4 - 2000.3

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  • Niigata University   Graduate School of Science and Technology   Research Assistant

    1995.7 - 1997.3

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  • Niigata University   Graduate School of Science and Technology   Research Assistant

    1995.7 - 1997.3

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Research History

  • Niigata University   Faculty of Engineering Department of Engineering   Associate Professor

    2017.4

  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Associate Professor

    2007.4

  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Associate Professor

    2007.4

  • Niigata University   Faculty of Engineering Department of Chemistry and Chemical Engineering   Associate Professor

    2007.4 - 2017.3

  • Niigata University   Faculty of Engineering   Associate Professor (as old post name)

    2000.4 - 2007.3

  • Niigata University   Faculty of Engineering   Research Assistant

    1997.4 - 2000.3

  • Niigata University   Graduate School of Science and Technology   Research Assistant

    1995.7 - 1997.3

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Professional Memberships

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Committee Memberships

  •   新潟県トリクロロエチレン排出抑制効果検証委員  

    2021.10   

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  •   東北放射線科学センター 理事  

    2021.8   

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  •   RADIOISOTOPES 論文編集委員会委員  

    2021.4   

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  • 新潟県環境審議会   審議会委員(環境管理部会,温泉部会)  

    2020.4   

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  •   佐渡市廃棄物処理施設整備検討委員会委員  

    2020.4   

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  •   新潟県トリクロロエチレン排出抑制検討会委員  

    2018.6 - 2020.3   

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  • 日本分析化学会   関東支部新潟地区部会部会長  

    2017.4 - 2018.3   

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    Committee type:Academic society

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  • 日本化学会   関東支部化学教育協議会委員  

    2013.4 - 2014.3   

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    Committee type:Academic society

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  • 新潟県酸性雨研究連絡協議会   会長  

    2011.11   

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    Committee type:Other

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  • 公益財団法人新潟市産業振興財団(IPC財団)   技術開発補助金審査会委員  

    2010.4 - 2019.3   

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    Committee type:Other

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  • 新潟県環境影響評価審査会   審査会委員  

    2010.3 - 2020.3   

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  • 日本化学会   関東支部新潟地域懇談会運営委員  

    2009.4 - 2011.3   

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  • 日本分析化学会   関東支部常任幹事  

    2008.3 - 2010.3   

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  • 新潟県酸性雨研究連絡協議会   幹事長  

    2005.11 - 2011.11   

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    Committee type:Other

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  • 新潟県環境審議会委員会   審議会委員  

    2005.6 - 2015.3   

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  • 日本化学会   関東支部新潟地域懇談会運営委員  

    2004.4 - 2007.3   

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  • 日本化学会   関東支部新潟地区地域化学教育小委員会委員  

    2003.4 - 2004.3   

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    Committee type:Academic society

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  • 日本化学会   関東支部化学教育協議会委員  

    2003.4 - 2004.3   

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Qualification acquired

  • Chief Person of Radiation Handling (first and second kind)

 

Papers

  • A Natural Zeolite Developed with 3-Aminopropyltriethoxysilane and Adsorption of Cu(II) from Aqueous Media Reviewed

    Nasanjargal Shirendev, Munkhpurev Bat-Amgalan, Naoki Kano, Hee-Joon Kim, Burmaa Gunchin, Batdemberel Ganbat, Ganchimeg Yunden

    Applied Sciences   12 ( 22 )   11344 - 11344   2022.11

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    In this work, we removed copper (II) from an aqueous solution by using zeolite modified with a silicon-organic monomer (3-aminopropyltriethoxysilane; APTES) depending on the pH, time, temperature, and initial concentration of Cu(II) ions. To confirm the modification process and assess the interaction between the modified zeolite and Cu(II), we performed instrumental analyses (XRD, SEM/EDX, TGA/DTA, BET, FT-IR, and XPS). We determined the maximum adsorption capacities of the modified zeolite for Cu(II) to be 4.50, 6.244, 6.96, and 20.66 mg/g at T = 25 °C (pH = 5, t = 8 h) when the initial concentrations of Cu(II) were 50, 100, 200, and 400 mg/L, respectively. According to the adsorption thermodynamics and kinetics, the second-order reaction controls the adsorption process. Based on the two isotherm models (Langmuir and Freundlich) with constant values (KL = 0.144, n = 2.764) and the correlation coefficients (R2 = 0.8946, R2 = 0.9216), we concluded that the Cu(II) adsorption onto the modified zeolite could be followed by the Freundlich isotherm model rather than the Langmuir isotherm model. The modified zeolite could be an effective material for the removal of Cu(II) from aqueous solutions.

    DOI: 10.3390/app122211344

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  • Adsorption of Chromium from an Aqueous Solution onto Chitosan Beads Modified with Sodium Dodecyl Sulfate (SDS) Reviewed

    Naoki Kano, Zou Ming, David Eva Vanessa Anak, Muhammad Nabil Md Sari

    Sorption - From Fundamentals to Applications   2022.9

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    Authorship:Corresponding author   Publishing type:Part of collection (book)   Publisher:IntechOpen  

    The goal of this research is to make chitosan beads that have been treated with sodium dodecyl sulfate (SDS) to remove chromium (Cr) from an aqueous solution effectively. The successful synthesis of the SDS-chitosan was proven through characterization, which were carried out using by scanning electron microscopy–energy dispersive X–ray spectroscopy (SEM-EDS), Fourier transform-infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The adsorption of Cr on the SDS material was investigated by varying experimental conditions such as pH, contact time and adsorbent dosage. The maximum adsorption capacity of SDS-chitosan for Cr(III) was estimated to be 3.42 mg·g−1 and 3.23 mg·g−1 for Cr(VI). Based on the results of adsorption kinetics and isothermal models, the adsorption process conform to the pseudo-second-order and Langmuir isotherm models. This indicates that the adsorption of Cr on SDS-chitosan is mainly dominated by chemical adsorption and monolayer reaction. In addition, according to thermodynamic analyses, the adsorption of Cr is an endothermic reaction. These results show that the new adsorbent has obvious application prospect for removing Cr.

    DOI: 10.5772/intechopen.104093

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  • Preparation and Characterization of Low-Cost Ceramic Membrane Coated with Chitosan: Application to the Ultrafine Filtration of Cr(VI) Reviewed

    Munkhpurev Bat-Amgalan, Naoto Miyamoto, Naoki Kano, Ganchimeg Yunden, Hee-Joon Kim

    Membranes   12 ( 9 )   835 - 835   2022.8

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    In this work, low-cost ceramic membranes (CMs) were prepared from ultrafine starting powders such as kaolin, clay, and starch by a dry compaction method. The ceramic membranes were sintered at different temperatures and times and were characterized by XRD, XRF, TG-DTA, SEM-EDS, N2-BET, water absorption, compressive strength, and pure water flux. The optimal membrane, sintered at 1000 °C for 3 h, possessed water absorption of 27.27%, a compressive strength of 31.05 MPa, and pure water flux of 20.74 L/h m2. Furthermore, chitosan crosslinked with glutaraldehyde was coated on the surface of the ceramic membrane by the dip coating method, and the pore size of the chitosan-coated ceramic membrane (CCCM) was 16.24 nm. Eventually, the separation performance of this membrane was assessed for the removal of chromium(VI) from aqueous solution. The ultrafine filtration of Cr(VI) was studied in the pH range of 2–7. The maximum removal of Cr(VI) was observed to be 71.25% with a pH of 3. The prepared CCCM showed good membrane properties such as mechanical stability and ultrafine structure, which have important applications for the treatment of wastewater including such heavy metals.

    DOI: 10.3390/membranes12090835

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  • Adsorption of an Anionic Surfactant (Sodium Dodecyl Sulfate) from an Aqueous Solution by Modified Cellulose with Quaternary Ammonium Reviewed

    Ming Zou, Haixin Zhang, Naoto Miyamoto, Naoki Kano, Hirokazu Okawa

    Polymers   14 ( 7 )   1473 - 1473   2022.4

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    Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    In this study, a method of removing an anionic surfactant sodium dodecyl sulfate (SDS) from an aqueous solution by cellulose modified with quaternary ammonium cation was discussed. Cellulose, as the adsorbent, was obtained from medical cotton balls, and the quaternary ammonium cation (synthesized from dodecyl dimethyl tertiary amine and epichlorohydrin) was grafted onto the sixth hydroxyl group of D-glucose in the cellulose by the Williamson reaction under alkaline conditions. The modified cellulose was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS); and the zeta potential of the material was also measured after confirmation of the synthesis of quaternary ammonium salts by nuclear magnetic resonance (NMR). From these analyses, a peak of the quaternary ammonium group was observed at 1637 cm−1; and it was found that the surface of the material exhibited a positive charge in pH 2–7. The optimal conditions for SDS adsorption by modified cellulose were pH of 7, contact time of 3 h, and temperature of 60 °C in this study. Typical adsorption isotherms (Langmuir and Freundlich) were determined for the adsorption process, and the maximal adsorption capacity was estimated as 32.5 mg g−1. The results of adsorption kinetics were more consistent with the pseudo-second-order equation, indicating that the adsorption process was mainly controlled by chemical adsorption. Furthermore, thermodynamic analysis indicated that the adsorption process of SDS on the modified cellulose was endothermic and spontaneous and that an increasing temperature was conducive to adsorption.

    DOI: 10.3390/polym14071473

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  • Development of a New Dolomite-Based Adsorbent with Phosphorus and the Adsorption Characteristics of Arsenic (III) in an Aqueous Solution Reviewed

    Zoltuya Khashbaatar, Shota Akama, Naoki Kano, Hee-Joon Kim

    Water   14 ( 7 )   1102 - 1102   2022.3

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    Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    In recent decades, the removal of hazardous chemicals that have entered wastewater and groundwater as a result of industrial and consumer activities has become an issue of concern. Specifically, removing arsenic (III) from groundwater is critical and equally crucial in the use of low-cost, efficient adsorbent materials. One purpose of this study was to develop a low-cost hydroxyapatite adsorbent (Ca5(PO4)3OH) by reacting the Ca component of calcined dolomite with phosphorus, and another was to apply the developed adsorbent to remove arsenic (III) from well water in developing countries. In this study, phosphorus adsorption was performed on thermally calcined dolomite, and the adsorption isotherm of the phosphorus study was investigated on selected calcined dolomite. The maximum amount of phosphorus on the selected calcined dolomite was 194.03 mg-P/g, and the Langmuir isotherm model was fitted. Arsenic (III) adsorption was investigated in a wide pH range (pH 2~12) using the new adsorbent. The amount of arsenic (III) adsorbed was 4.3 mg/g. The new absorbent could be effective in removing arsenic (III) and become an affordable material.

    DOI: 10.3390/w14071102

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  • Adsorption of Cr(III) from an Aqueous Solution by Chitosan Beads Modified with Sodium Dodecyl Sulfate (SDS) Reviewed

    Munkhpurev Bat-Amgalan, Zoltuya Khashbaatar, David Eva Vanessa Anak, Muhammad Nabil Md Sari, Naoto Miyamoto, Naoki Kano, Hee-Joon Kim, Ganchimeg Yunden

    Journal of Environmental Protection   12 ( 11 )   939 - 960   2021.11

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Scientific Research Publishing, Inc.  

    DOI: 10.4236/jep.2021.1211055

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  • The Removal of Chromium(VI) from Aqueous Solution by Amine-Functionalized Zeolite: Kinetics, Thermodynamics, and Equilibrium Study Reviewed

    Shirendev Nasanjargal, Bat-Amgalan Munkhpurev, Naoki Kano, Hee-Joon Kim, Yunden Ganchimeg

    Journal of Environmental Protection   12 ( 09 )   654 - 675   2021.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Scientific Research Publishing, Inc.  

    DOI: 10.4236/jep.2021.129040

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  • Removal of Cesium from Radioactive Waste Liquids Using Geomaterials Reviewed

    Haixin Zhang, Mingze Zhu, Xiaoyu Du, Sihan Feng, Naoto Miyamoto, Naoki Kano

    Applied Sciences   11 ( 18 )   8407 - 8407   2021.9

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    In this study, we investigated the removal of Cs from aqueous solutions using geomaterials. Adsorption was chosen as an effective method to develop for the removal of Cs from radioactive waste liquids. Geomaterials, including fly ash and slag as raw materials, were prepared as adsorbents using an alkali activator. The materials were characterized by X-ray diffraction (XRD); scanning electron microscopy with energy dispersive spectrometer (SEM-EDS); and BET surface area, pore volume, and pore size analysis. The effects of various parameters, such as pH, contact time, and adsorbent dosage on the adsorption of the Cs were studied. The partition coefficient (PC) as well as the adsorption capacity were evaluated to assess the true performance of the adsorbent in this work. The fly ash-based geomaterials showed a maximum Cs adsorption capacity of 89.32 mg·g−1 and a high PC of 31.02 mg·g−1·mM−1 for the Cs under our experimental conditions. From this work, this method can be regarded being practical for use as a potential adsorbent for treating Cs in wastewater. Furthermore, the immobilization of Cs in geomaterials was explored from a chemical perspective. In conclusion, fly ash-based geomaterials may be a promising option for the treatment and disposal of nuclear-contaminated waste.

    DOI: 10.3390/app11188407

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  • Adsorption of REEs from Aqueous Solution by EDTA-Chitosan Modified with Zeolite Imidazole Framework (ZIF-8) Reviewed

    Sihan Feng, Xiaoyu Du, Munkhpurev Bat-Amgalan, Haixin Zhang, Naoto Miyamoto, Naoki Kano

    International Journal of Molecular Sciences   22 ( 7 )   3447 - 3447   2021.3

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    Chitosan (CS) modified with ethylenediamine tetraacetic acid (EDTA) was further modified with the zeolite imidazole framework (ZIF-8) by in situ growth method and was employed as adsorbent for the removal of rare-earth elements (REEs). The material (EDTA–CS@ZIF-8) and ZIF-8 and CS were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and nitrogen adsorption/desorption experiments (N2- Brunauer–Emmet–Teller (BET)). The effects of adsorbent dosage, temperature, the pH of the aqueous solution, contact time on the adsorption of REEs (La(III), Eu(III), and Yb(III)) by EDTA–CS@ZIF-8 were studied. Typical adsorption isotherms (Langmuir, Freundlich, and Dubinin–Radushkevich (D-R)) were determined for the adsorption process, and the maximal adsorption capacity was estimated as 256.4 mg g−1 for La(III), 270.3 mg g−1 for Eu(III), and 294.1 mg g−1 for Yb(III). The adsorption kinetics results were consistent with the pseudo-second-order equation, indicating that the adsorption process was mainly chemical adsorption. The influence of competing ions on REE adsorption was also investigated. After multiple cycles of adsorption/desorption behavior, EDTA–CS@ZIF-8 still maintained high adsorption capacity for REEs. As a result, EDTA–CS@ZIF-8 possessed good adsorption properties such as stability and reusability, which have potential application in wastewater treatment.

    DOI: 10.3390/ijms22073447

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  • Study on the Behavior and Removal of Cadmium and Zinc Using Taraxacum officinale and Gazania under the Application of Biodegradable Chelating Agents Reviewed

    Naoki Kano, Takumi Hori, Haixin Zhang, Naoto Miyamoto, David Eva Vanessa Anak, Kenji Mishima

    Applied Sciences   11 ( 4 )   1557 - 1557   2021.2

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    The removal of cadmium (Cd) and zinc (Zn) from soil by phytoremediation was investigated using Taraxacum officinale and Gazania. A plant environmental control system was used to cultivate the plants. The effects of different biodegradable chelating agents (i.e., EDDS, HIDS, and GLDA), relative humidity, and other competitive metals on the adsorption of Cd and Zn were also studied. In addition, the approach for metal recovery was explored by extraction of metals from plants after phytoremediation using Gazania. The concentrations of Cd and Zn were determined by inductively coupled plasma mass spectrometry (ICP-MS). In addition, one-way analysis of variance (ANOVA) tests were performed.to determine significant differences between the experimental treatments adopted in this work. Consequently, the following main conclusions were obtained: (1) In the case of Taraxacum officinale, Cd and Zn could be removed even under the presence of other heavy metals. (2) By adding a chelating agent, the amount absorbed by the shoot generally increased. (3) In the case of Gazania, the concentration of Cd was higher in root than that in shoot, whereas the concentration of Zn was higher in the shoot than that in the root. (4) Taraxacum officinale was more suitable for phytoremediation of Cd than Gazania. (5) Cd and Zn could be extracted from plants by adding a low concentration of nitric acid. (6) The one-way ANOVA tests showed no statistically significant differences among the experimental treatments.

    DOI: 10.3390/app11041557

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  • Estimation of Environmental Behavior in Recent Years Based on the Viewpoint of Tritium (T) Concentration and Oxygen, Hydrogen Stable Isotope Ratios (18O, D) in Precipitation Invited Reviewed

    Naoki Kano, Takahide Morohashi, Naoto Miyamoto

    RADIOISOTOPES   70 ( 1 )   41 - 54   2021.1

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)  

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  • Characteristics of Lagoon Water Systems and Precipitation in Niigata City in Recent Years from Oxygen and Hydrogen Stable Isotope Ratios (<i>δ</i><sup>18</sup>O, <i>δ</i>D), Tritium (T) Concentration and Various Ion Concentrations Reviewed

    Kohei Oishi, Takayuki Enomoto, Syunki Sato, Takahide Morohashi, Naoto Miyamoto, Naoki Kano, Hiroshi Imaizumi, Naoki Watanabe

    RADIOISOTOPES   69 ( 9 )   299 - 313   2020.9

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Radioisotope Association  

    DOI: 10.3769/radioisotopes.69.299

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  • Removal of Chromium(VI) by Chitosan Beads Modified with Sodium Dodecyl Sulfate (SDS) Reviewed

    Xiaoyu Du, Chihiro Kishima, Haixin Zhang, Naoto Miyamoto, Naoki Kano

    Applied Sciences   10 ( 14 )   4745 - 4745   2020.7

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    In this study, chitosan beads modified with sodium dodecyl sulfate (SDS) were successfully synthesized and employed for the removal of chromium(VI) (Cr(VI)). The adsorption performance of the adsorbent (SDS-chitosan beads) was examined by batch experiments. The partition coefficient (PC) as well as the adsorption capacity were evaluated to assess the true performance of the adsorbent in this work. The adsorbent (SDS-chitosan beads) showed a maximum Cr(VI) adsorption capacity of 3.23 mg·g−1 and PC of 9.5 mg·g−1·mM−1 for Cr(VI). The prepared adsorbent was characterized by different techniques such as scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS) and Fourier transform-infrared spectroscopy (FT-IR). We used inductively coupled plasma mass spectrometry (ICP-MS) for the determination of Cr(VI) in solution. The experimental data could be well-fitted by pseudo-second-order kinetic and Langmuir isotherm models. The thermodynamic studies indicated that the adsorption process was favorable under the higher temperature condition. The SDS-modified chitosan beads synthesized in this work represent a promising adsorbent for removing Cr(VI).

    DOI: 10.3390/app10144745

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  • Characteristic of Prussian Blue Analogue Used in Caesium Adsorption and Study of Caesium Removal from Aqueous Solution Reviewed

    Yuta HORII, Naoto MIYAMOTO, Naoki KANO, Hiroshi IMAIZUMI

    RADIOISOTOPES   69 ( 7 )   217 - 231   2020.7

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Radioisotopes Association  

    DOI: 10.3769/radioisotopes.69.217

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  • Adsorption and Desorption Mechanisms of Rare Earth Elements (REEs) by Layered Double Hydroxide (LDH) Modified with Chelating Agents Reviewed

    Shuang Zhang, Naoki Kano, Kenji Mishima, Hirokazu Okawa

    Applied Sciences   9 ( 22 )   4805 - 4805   2019.11

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:MDPI AG  

    In order to obtain the adsorption mechanism and adsorption structures of Rare Earth Elements (REEs) ions adsorbed onto layered double hydroxides (LDH), the adsorption performance of LDH and ethylenediaminetetraacetic acid (EDTA) intercalated LDH for REEs was investigated by batch experiments and regeneration studies. In addition to adsorption capacity, the partition coefficient (PC) was also evaluated to assess their true performance metrics. The adsorption capacity of LDH increases from 24.9 μg·g−1 to 145 μg·g−1 for Eu, and from 20.8 μg·g−1 to 124 μg·g−1 for La by intercalating EDTA in this work; and PC increases from 45.5 μg·g−1·uM−1 to 834 μg·g−1·uM−1 for Eu, and from 33.6 μg·g−1·μM−1 to 405 μg·g−1·μM−1 for La. Comparison of the data indicates that the adsorption affinity of EDTA-intercalated LDH is better than that of precursor LDH no matter whether the concept of adsorption capacity or that of the PC was used. The prepared adsorbent was characterized by XRD, SEM-EDS and FT-IR techniques. Moreover, quantum chemistry calculations were also performed using the GAUSSIAN09 program package. In this calculation, the molecular locally stable state structures were optimized by density functional theory (DFT). Both the quantum chemistry calculations and the experimental data showed that REEs ions adsorbed by EDTA-intercalated LDH are more stable than those adsorbed by precursor LDH. Furthermore, the calculation results of adsorption and desorption rates show that adsorption rates are larger for Eu(III) than for La(III), which agrees with the experimental result that Eu(III) has a higher adsorption ability under the same conditions. The LDHs synthesized in this work have a high affinity for removing REEs ions.

    DOI: 10.3390/app9224805

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  • The Removal of Cr(III) from Aqueous Solution Using Modified Wool Reviewed

    Yunden, G, Kano, N, Kim, H. J

    J. Chem. Chem. Eng.   13   55 - 61   2019.5

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  • Combined experimental and quantum chemistry studies on the pH dependence of the adsorption efficiency of uranium (VI): Lewis theory of acid-base reactions in adsorption processes Reviewed

    Mishima, K, Deng, Y, Feng, S, Abe, M, Miyamoto, N, Kano, N

    J. Phys. Chem. C   2019.1

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  • Experimental and Theoretical Studies on the Adsorption Mechanisms of Uranium (VI) Ions on Chitosan Reviewed

    Kenji Mishima, Xiaoyu Du, Naoto Miyamoto, Naoki Kano, Hiroshi Imaizumi

    J. Funct. Biomater.   2018.8

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    DOI: 10.3390/jfb9030049

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  • Studies on decolorization of orange peel pectin by using corncob activated carbon (CAC), kinetics and thermodynamics of interactions Reviewed

    XIAOYU-DU, Q. U. YAN-QING, W. U. CHUN AND, NAOKI KANO

    J. Appl. Chem. Sci. Int.   2018.7

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  • Study on Removal of Cr(VI) from Aqueous Solution by Cross-Linked Chitosan Reviewed

    Xiaoyu Du, Yanling Deng, Shunsuke Sekiguchi, Naoto Miyamoto, Naoki Kano, Hiroshi Imaizumi

    J. Environ. Sci. Eng. A   2018.1

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  • Experimental and theoretical studies on the adsorption and desorption mechanisms of chromate ions on cross-linked chitosan Reviewed

    Mishima, K, Du, X, Sekiguchi, S, Kano, N

    J. Funct. Biomater.   2017.12

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    DOI: 10.3390/jfb8040051

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  • Stable Isotope Analysis of Hydrogen and Oxygen in a Traditional Japanese Alcoholic Beverage, Sake, from Niigata Prefecture in Japan and Other Countries Reviewed

    Takashi Kuribayashi, Masamichi Sugawara, Keigo Sato, Yoshihito Nabekura, Toshio Aoki, Naoki Kano, Toshio Joh, Mitsuoki Kaneoke

    ANALYTICAL SCIENCES   33 ( 8 )   979 - 982   2017.8

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    Stable hydrogen and oxygen isotopic compositions (delta D and delta O-18 values, respectively) were analyzed for "sake," a traditional Japanese alcohol beverage, to assess these values for the identification of its geographic origin. We collected sake (Junmai-shu; made of only rice, water, and koji) and its source water (i.e., brewing water) from breweries in Niigata Prefecture, Japan, and measured the isotopic compositions of water in these samples. The delta D and delta O-18 values for the sake are well correlated with their respective values for the corresponding brewing water (delta D; r = 0.92, delta O-18; r = 0.80). Furthermore, based on the delta D-delta O-18 cross plot, sake brewed in Niigata Prefecture is distinguishable from that brewed in countries other than Japan. These results imply that this dual isotope (delta D and delta O-18) analysis is potentially useful in identifying the geographic origin of sake.

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  • Recovery of Gold from Aqueous Solution Containing Au (III) by Silicon Organic Polymer Reviewed

    Yunden, G, Gunchin, B, Kano, N, Kim, H

    J. Chem. Chem. Eng   11   15 - 21   2017.1

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  • Adsorption of Cr(VI) onto Hybrid Membrane of Carboxymethyl Chitosan and Silicon Dioxide Reviewed

    Yanling Deng, Naoki Kano, Hiroshi Imaizumi

    JOURNAL OF CHEMISTRY   2017

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    In this study, a new adsorbent material was synthesized by using carboxymethyl chitosan and silicon dioxide. The hybrid membrane was used as an adsorbent for the removal of Cr(VI) from aqueous solutions. The adsorption potential of Cr(VI) by the hybrid materials was investigated by varying experimental conditions such as pH, contact time, and the dosage of the hybrid membrane. Adsorption isotherms of Cr(VI) onto the hybrid membrane were studied with varying initial concentrations under optimum experiment conditions. The surface property of the hybrid membrane was characterized by SEM (scanning electron microscope) and Fourier transform infrared spectrometer (FTIR). The concentrations of Cr(VI) in solution are determined by ICP-AES (inductively coupled plasma atomic emission spectrometry). The present study investigates the adsorption mechanisms of Cr(VI) onto the hybrid membrane. The results provide new insight, demonstrating that the modified hybrid membrane can be an efficient adsorbent for Cr(VI) from the aqueous solution.

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  • Adsorption of rare earth elements (REEs) onto Activated Carbon Modified with Potassium Permanganate (KMnO4) Reviewed

    Kano, N, Pang, M, Deng, Y, Imaizumi, H

    J. Appl. Sol. Model.   2017

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  • Observation of Tritium Behavior Both in Monthly Precipitation in Niigata City and in Spring Water at Top of Mt. Zao and Some Mountains in Fukushima Prefecture After the Fukushima Dai-ichi Nuclear Power Plant Accident Reviewed

    Ying WANG, Shogo MORITA, Noriaki KATAOKA, Hiroshi IMAIZUMI, Naoki KANO

    RADIOISOTOPES   65 ( 10 )   409 - 414   2016.10

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    DOI: 10.3769/radioisotopes.65.409

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  • Combined experimental and quantum chemical study on the adsorption mechanism of phosphorous anions on the hydrotalcite surfaces Reviewed

    Kenji Mishima, Shuang Zhang, Sho Minagawa, Naoki Kano

    FUNCTIONAL MATERIALS LETTERS   9 ( 5 )   2016.10

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    In the present work, the hydrotalcite-like compound [Mg6Al2(OH)(16)]CO3 center dot nH(2)O (shorted as MgAl-CO3) is synthesized and the adsorption of phosphorous anions, their adsorption performance on the surface of hydrotalcites, and its mechanism are analyzed. To theoretically clarify the adsorption mechanism and adsorption structures, we perform quantum chemistry calculations of reactants, locally stable states, transition states, and products among phosphorous anion, water, and hydrotalcite in a variety of pH ranges. The experimental result shows that the efficiency of phosphate removal does not depend on pH of the solution, with which the numerical results are consistent. In particular, we identify the factors of influencing the adsorption ratio in different pH ranges from the quantum chemistry calculations: the stability of locally stable states, and the energies and locations of potential barriers along the reaction pathway relative to those of the locally stable states. The results suggest that hydrotalcites synthesized in this work are suitable as sorbent materials for the adsorption and removal of phosphorous anions from aqueous solutions.

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  • Removal of Chromium from Aqueous Solution Using Hybrid Membrane of Chitosan and Silicon Dioxide Reviewed

    Yanling DENG, Naoki KANO, Hiroshi IMAIZUMI

    J. Chem. Chem. Eng   10   199 - 206   2016.10

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  • Adsorption of Cd(II) on Zn-Al LDHs (Layered Double Hydroxides) Intercalated with Chelating Agents EDTA Reviewed

    Shuang Zhang, Naoki Kano, Hiroshi Imaizumi

    J. Chem. Chem. Eng.   10   60 - 67   2016.6

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    DOI: 10.17265/1934-7375/2016.02.002

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  • Synthesis and Characterization of LDHs (Layered Double Hydroxides) Intercalated with EDTA (Ethylenediaminetetraacetic Acid) or EDDS (N, N'-1, 2-Ethanediylbis-1-Aspartic Acid Reviewed

    Zhang, S, Kano, N, Imaizumi, H

    J. Environ. Sci. Eng. A   5   549 - 558   2016

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  • Effect of Fukushima Daiichi Nuclear Power Plant on Lakes in Fukushima Prefecture and Niigata City Reviewed

    Naoyuki Kanda, Ying Wang, Noriaki Kataoka, Ryuta Yamada, Hiroshi Imaizumi, Naoki Kano

    Radioisotopes   64 ( 12 )   717 - 728   2015.12

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    DOI: 10.3769/radioisotopes.64.717

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  • Investigation of Tritium and Radiocaesium in Spring Water and Short Precipitation after the Fukushima Dai-ichi Nuclear Power Plant Accident Reviewed

    Wang Ying, Noriaki Kataoka, Naoyuki Kanda, Ryuta Yamada, Minami Watanabe, Shogo Morita, Hiroshi Imaizumi, Naoki Kano

    Radioisotopes   64 ( 9 )   553 - 561   2015.9

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    <i>Hydrogen explosion occurred at Fukushima Dai-ichi nuclear power plants in Japan on 12―15<sup>th</sup> March, 2011. At the same time, lots of radioactive materials have been released including tritium(</i>T<i>), and caused serious environmental impacts. In order to investigate the effect of the accident of Fukushima Dai-ichi nuclear power plant on environment, we collected the short precipitation(hourly collected precipitation) and spring water for several years after the accident. As to the precipitation collected, </i>T<i> and radiocaesium were measured by using liquid scintillation counter and high-purity germanium detector, respectively. Furthermore, we also measured the concentration of ions(</i>Na<sup>+</sup><i>,</i> Cl<sup>-</sup><i>,</i> Ca<sup>2+</sup><i>, and</i> SO<sub>4</sub><sup>2-</sup><i>) in spring water. From the above-mentioned matters, the following points have been obtained:(1)The variation of </i>T<i> concentration in recent three years(2012, 2013 and 2014) can be clarified. (2)The effect of the accident on spring water in mountains around the Fukushima prefecture is so small. (3)As to the short precipitation on 15<sup>th</sup> March, 2011, the activity of radiocaesium was not detected, but the activity of </i>T<i> was detected significantly.</i>

    DOI: 10.3769/radioisotopes.64.553

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  • Adsorption of Chromium(VI) onto Activated Carbon Modified with KMnO4 Reviewed

    Meiling Pang, Bing Liu, Naoki Kano, Hiroshi Imaizumi

    Journal of Chemistry and Chemical Engineering,USA   9   2015.9

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  • Removal of Chromium from Aqueous Solution Using Yukitsubaki Carbon Reviewed

    Yanling Deng, Naoki Kano, Sho Nakamori, Liang Xu, Hiroshi Imaizumi

    Journal of Chemistry and Chemical Engineering, USA   2015.9

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  • 台風時における短期降水中のトリチウムと各種イオンの動態解析 Reviewed

    山田龍太, 渡辺 南, Wang Ying, 片岡憲昭, 森田尚悟, 今泉 洋, 狩野直樹

    Radioisotopes   2015.7

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    DOI: 10.3769/radioisotopes.64.455

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  • 下水道汚泥灰から高効率リン回収法の開発と重金属除去 Invited Reviewed

    金 煕濬, 狩野直樹

    ケミカルエンジニヤリング   60 ( 7 )   522 - 527   2015.7

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  • Adsorption of lead by zeolite/chitosan hybrid composite Reviewed

    Meiling PANG, Yanling DENG, Naoki KANO, Hiroshi IMAIZUMI

    Energy and Environment   2015.4

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  • Environmental characteristics of lagoon waters in Niigata Prefecture, Japan and the effect of precipitation on the water quality of lagoon Reviewed

    A. Tiemuer, C. Li, M. Pang, N. Kano, H. Imaizumi

    Energy and Environment   2015.4

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  • Biosurfactants-enhanced phytoremediation of Pb-contaminated soil by braissca juncea Reviewed

    L. GAO, R. ZHENG, N. KANO, H. IMAIZUMI

    Energy and Environment   2015.4

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  • Isotopic and Chemical Characteristics of Lagoon Waters in Niigata Prefecture, Japan Reviewed

    Adilijiang Tiemuer, Naoki Kano, Hiroshi Imaizumi, Naoki Watanabe

    Journal of Environmental Science and Engineering   2015.4

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  • Biosorption of Chromium from Aqueous Solution Using Chitosan Reviewed

    Naoki Kano, Kunihiro Tanabe, Meiling Pang, Yanling Deng, Hiroshi Imaizumi

    J. Chem. Chem. Eng.   8   1049 - 1058   2014.12

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    DOI: 10.17265/1934-7375/2014.11.005

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  • Oxygen Stable Isotopic Ratio in Precipitations in Niigata Prefecture, Japan Reviewed

    Adilijiang Tiemuer, Naoki Kano, Maiko Sasaki, Hiroshi Imaizumi, Naoki Watanabe

    Journal of Environ. Sci. Engineering   2014.12

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  • Evaluation of the Reactivity of L-tyrosine in the T-for-H Exchange Reaction at Low Temperature Reviewed

    Noriaki Kataoka, Naoyuki Kanda, Hiroshi Imaizumi, Naoki Kano

    RADIOISOTOPES   63 ( 9 )   429 - 434   2014.9

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    DOI: 10.3769/radioisotopes.63.429

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  • T-for-H交換反応における各種ピリジン誘導体の速度論的反応解析と未知のニコチン酸誘導体の反応性推定への応用 Reviewed

    青塚 潤, 王 蛍, 佐藤貴之, 片岡 憲昭, 今泉 洋, 狩野直樹

    RADIOISOTOPES   63 ( 6 )   283 - 291   2014.6

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  • Adsorption of Heavy Metal onto Activated Carbon Modified with Potassium Permanganate Reviewed

    Meiling Pang, Liang Xu, Naoki Kano, Hiroshi Imaizumi

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   47 ( 5 )   386 - 391   2014.5

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    This study investigated the adsorption of lead ions (Pb2+) by activated carbon modified with potassium permanganate (KMnO4). Activated carbon was chemically modified through impregnation with solutions of KMnO4 (0.01 mol/L and 0.03 mol/L). Adsorption experiments from aqueous solutions containing known amounts of Pb2+ were explored in a batch system. The amount of Pb2+ adsorbed at different pH values, initial concentrations, sorbent dosages, contact times, and temperature were determined by atomic absorption spectrometry (AAS) in order to determine the optimum conditions for Pb2+ adsorption. Moreover, the effects of common ions like sodium, potassium, calcium, and magnesium on the adsorption capacity were also studied. The Pb2+ adsorption on modified and unmodified activated carbon conformed to the Langmuir isothermal adsorption equation. Overall the modified activated carbon exhibited a higher adsorption capacity and stronger chemical affinity than pristine activated carbon. The rates of adsorption were found to conform to pseudo-second order kinetics.

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  • Removal of U(VI) from Aqueous Solution Using Carbon Modified with Nitric Acid Reviewed

    Liang Xu, Meiling Pang, Naoki Kano, Hiroshi Imaizumi

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   47 ( 4 )   319 - 323   2014

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    Adsorption of uranium (VI) from aqueous solution onto Yukitsubaki carbon (YKC) modified with nitric acid (10% and 30%) has been investigated in a batch system. Adsorption parameters such as contact time, carbon dosage, pH of solution and temperature onto the modified carbon have been determined with ICP-MS in order to obtain the optimum conditions for the U(VI) adsorption process. Adsorption isotherms of U(VI) onto the modified and pristine carbon were measured at varying initial concentrations under optimized condition. The surface properties of the modified carbon as well as the pristine carbon were characterized using N-2-BET, SEM and FT-IR. The results show that the U(VI) adsorption capacity of YKC is increased after the modification with nitric acid, and that the Langmuir isotherm model fits the experimental data better than the Freundlich isotherm.

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  • Adsorption of Cu(II), Pb(II) by Mg-Al Layered Double Hydroxides (LDHs): Intercalated with the Chelating Agents EDTA and EDDS Reviewed

    Shuang Zhang, Naoki Kano, Hiroshi Imaizumi

    JOURNAL OF CHEMICAL ENGINEERING OF JAPAN   47 ( 4 )   324 - 328   2014

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    The hydrotalcite-like compound [Mg2Al(OH)(6)]NO3 center dot nH(2)O (shorted as MgAl-NO3) was intercalated with the chelating agent ethylenediaminetetraacetic acid (EDTA) and N,N'-1,2-ethanediylbis-1-aspartic acid (EDDS) by anion exchange to uptake heavy metal ions (Cu2+ , Pb2+) from aqueous solutions. These layered double hydroxides (LDHs) synthesized in this work were used to adsorb Cu2+ and Pb2+. The amount of Cu2+ or Pb2+ adsorbed at different pH, temperature, and the dosage of adsorbent was determined by atomic absorption spectrometry (AAS). The structure, the composition and the surface properties of precursor-LDHs and intercalated-LDHs (intercalated with the chelating agents) were characterized by chemical analysis, Fourier transform infrared spectroscopy (FT-IR), powder X-ray diffraction (XRD) and a physical adsorption analyzer. Comparative experiments were carried out with commercially available LDH adsorbent (i.e., Kyowa DHT-4A). The adsorption behaviors of the MgAl-LDHs for Cu2+ and Pb2+ in aqueous were investigated by applying the adsorption results to the Freundlich isotherms model, and the data were well fitted by the model. The results suggested that MgAl-LDHs synthesized in this work could be suitable as sorbent materials for the adsorption and removal of heavy metal ions from aqueous solutions.

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  • “Concentration and Chemical Speciation of Heavy Metals in Sludge and Removal of Metals by Biosurfactants Application” Reviewed

    Lidi Gao, Naoki Kano, Hiroshi Imaizumi

    Journal of Chemistry and Chemical Engineering (USA)   7 ( 12 )   1188 - 1202   2013.12

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  • Water Quality and Isotopic Characteristics of Lagoon Waters in Niigata Prefecture Reviewed

    TIEMUER Adiljiang, KANO Naoki, IMAIZUMI Hiroshi, LI Chong, WATANABE Naoki, ZHENG Yongjie

    RADIOISOTOPES   62 ( 7 )   409 - 421   2013.7

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    In order to reveal the quality and isotopic characteristics of lagoon waters in Niigata Prefecture in recent years, the nutrients concentrations of nitrogen (N) and phosphorus (P) as well as oxygen stable isotope ratios(i.e., δ<sup>18</sup>O) in water samples of Sakata and Toyanogata were measured.<br>Samples were regularly taken at the fixed sampling points from these lagoons, and depth distribution was surveyed at one point in Toyanogata. In addition, δ<sup>18</sup>O and nutrients concentrations of water samples in Zhalong Wetland at Heilongjiang Province in China were also determined.<br>Consequently, the following matters have been mainly clarified. (1) δ<sup>18</sup>O values of sample waters in Zhalong Wetland are generally large probably because of the effect of evaporation, whereas those of Sakata lagoon are large which may be due to the biological process such as the activity of plankton. (2) Considering the results of nutrients concentrations, the water quality of lagoon (Sakata and Toyanogata) waters in Niigata Prefecture is better than that of Zhalong Wetland in China.

    DOI: 10.3769/radioisotopes.62.409

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  • Seasonal Variation of Tritium and Major Elements in Snow and Precipitation in Niigata Japan

    Yurong Jiao, Hiroshi Imaizumi, Naoki Kano

    Journal of Environmental Science and Engineering   2012.10

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  • Kinetic estimation of hydrogen isotope exchange reaction between tritiated-water (HTO) vapor and each amino acid in a heterogeneous system Reviewed

    Noriaki Kataoka, Hiroshi Imaizumi, Naoki Kano

    JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY   49 ( 7 )   667 - 672   2012.7

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    The hydrogen isotope exchange reaction between HTO vapor and each amino acid has been observed in order to establish a method of estimation of the internal exposure of organically bound tritium in a heterogeneous system at 25 similar to 70 degrees C. Rate constants (k) for the amino acids have been obtained by applying the A ''-McKay plot method. Using these k values, Arrhenius plots for both the COOH and NH2 groups are drawn, and linearity was obtained over the range of 25 similar to 70 degrees C. Comparing the rate constants, the following four statements can be made regarding the T-for-H exchange reaction. (1) The reactivity of the functional groups in amino acids increases with increasing temperature. (2) Applying Taft's equation, the ratio of polar effect to steric effect is 2:8 in the COOH group and 9:1 in the NH2 group at 25 degrees C. (3) The A ''-McKay plot method is useful for studying the reactivity of materials, not only with one (or the same kind of) functional group(s) but also with two different kinds of functional groups. (4) The method used in this work may be useful to investigate the behavior of organically bound tritium, quantitatively.

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  • Behavior and Distribution of Heavy Metals Including Rare Earth Elements, Thorium, and Uranium in Sludge from Industry Water Treatment Plant and Recovery Method of Metals by Biosurfactants Application Reviewed

    Lidi Gao, Naoki Kano, Yuichi Sato, Chong Li, Shuang Zhang, Hiroshi Imaizumi

    BIOINORGANIC CHEMISTRY AND APPLICATIONS   2012

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    In order to investigate the behavior, distribution, and characteristics of heavy metals including rare earth elements (REEs), thorium (Th), and uranium (U) in sludge, the total and fractional concentrations of these elements in sludge collected from an industry water treatment plant were determined and compared with those in natural soil. In addition, the removal/recovery process of heavy metals (Pb, Cr, and Ni) from the polluted sludge was studied with biosurfactant (saponin and sophorolipid) elution by batch and column experiments to evaluate the efficiency of biosurfactant for the removal of heavy metals. Consequently, the following matters have been largely clarified. (1) Heavy metallic elements in sludge have generally larger concentrations and exist as more unstable fraction than those in natural soil. (2) Nonionic saponin including carboxyl group is more efficient than sophorolipid for the removal of heavy metals in polluted sludge. Saponin has selectivity for the mobilization of heavy metals and mainly reacts with heavy metals in F3 (the fraction bound to carbonates) and F5 (the fraction bound to Fe-Mn oxides). (3) The recovery efficiency of heavy metals (Pb, Ni, and Cr) reached about 90-100% using a precipitation method with alkaline solution.

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  • Effect of EDTA and EDDS on phytoremediation of Pb- and Zn-contaminated soil by Brassica Juncea Reviewed

    Lidi Gao, Naoki Kano, Yuichi Sato, Shuang Zhang, Hiroshi Imaizumi

    ADVANCES IN ENVIRONMENTAL SCIENCE AND ENGINEERING, PTS 1-6   518-523   5040 - 5046   2012

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    Effect of EDTA and EDDS on phytoremediation of Pb- and Zn- contaminated soil by Brassica Juncea was investigated in this work. Especially, the effect of the kind and the method of adding chelating agent was investigated during the plant growth. Plants were grown in an environmental control system. The biomass of the whole plant was weighed, and the uptake of Pb and Zn in shoot and root were determined using ICP-AES. Consequently, the following matters have been obtained: (1) Both EDTA and EDDS significantly enhanced the translocation of metals (Pb and Zn) in soil from root to shoot. Furthermore, the two chelating agents resulted in a sharply biomass loss for more than 30% of the control. As a result, the total uptake amount of metals by Brassica Juncea was decreased (except the uptake of Pb with the addition of 3.0 mmol.kg(-1) EDTA). (2) EDDS showed the higher inhibition for the growth of Brassica Juncea than EDTA. (3) The method for adding EDTA and EDDS at several times separately did not necessarily increase the uptake of heavy metals.

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  • “Fractional determination of Some Metallic Elements including Rare Earth Elements, Thorium and Uranium in Agriculture Soil by Sequential Extraction Procedure”「"jointly worked"」 Reviewed

    Lidi GAO, Naoki KANO, Yoshimasa HIGASHIDAIRA, Yoshikazu NISHIMURA, Ryo ITO, Hiroshi IMAIZUMI

    Radioisotopes   60 ( 11 )   443 - 459   2011.11

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  • "Observation of the Movement of the Precipitation by Using Tritium Tracer" 「"jointly worked"」 Reviewed

    Yurong Jiao, Sayuri ISHIDA, Kayoko TAKADA, Hiroshi IMAIZUMI, Naoki KANO, Masaaki Saito

    Radioisotopes   60 ( 9 )   2011.9

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  • Behavior of Water of Crystallization in CuSO<sub>4</sub>5H<sub>2</sub>O Studied by the Tritium Tracer Method ["jointly worked"] Reviewed

    Tetsuya SATO, Yurong JIAO, Hiroshi IMAIZUMI, Naoki KANO

    60 ( 5 )   215 - 219   2011.5

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  • Biosorption of Lanthanides using Three Kinds of Seaweed Biomasses 「"jointly worked"」 Reviewed

    Nobuo SAKAMOTO, Naoki KANO, Yudan WANG, Lidi GAO, Hiroshi IMAIZUMI

    Radioisotopes   59 ( 11 )   623 - 636   2010.11

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    In order to evaluate the efficiency of seaweed biomass as sorbent for rare earth elements(REEs), sorption experiment from aqueous solutions containing known amount of lanthanide(La, Eu or Yb) using three kinds of Ca-loaded dried seaweeds(brown algae:Sargassum hemiphyllum, green algae:Ulva pertusa and red algae:Schizymenia dubyi) in single component system was explored. Furthermore, the sorption mechanism of these elements was investigated by applying Langmuir and Freundlich isotherm equations to the data obtained. In addition, to confirm the characteristics of the seaweed biomasses, the surface morphology of the biomass before and after metal adsorption was determined by Scanning Electron Microscope(SEM).<br>Consequently, the following matters have been mainly clarified. (1)The morphology of Sargassum hemiphyllum and Ulva pertusa surface has hardly changed even after exposing to metals. On the other hand, the change of the surface condition on Schizymenia dubyi after adsorption was observed. (2)Adsorption isotherms using the seaweed biomass can be described by Langmuir and Freundlich isotherms satisfactorily for lanthanide. These adsorption may have occurred mainly by monolayer reaction because of better-fitting for Langmuir model. (3)The seaweed biomasses could be an efficient sorbent for REEs. Particularly, Ulva pertusa is found to be a promising biosorbent for removing La. (4)Ion-exchange process is considered to be the main mechanism responsible for the sorption of lanthanide ion onto the seaweed biomass.

    DOI: 10.3769/radioisotopes.59.623

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  • Biosorption of Rare Earths Elements, Thorium and Uranium using Buccinum Tenuissimum Shell Biomass 「"jointly worked"」 Reviewed

    Yudan WANG, Yusuke KOTO, Nobuo SAKAMOTO, Naoki KANO, Hiroshi IMAIZUMI

    Radioisotopes   59 ( 9 )   2010.9

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  • Two steps Simultaneous Analysis of Reactivity of L-Norvaline in the T-for-H Exchange Reaction -Application of Taft Equation to Influence of Polar Effect and Steric Effect- ["jointly worked"] Reviewed

    Noriaki KATAOKA, Hiroshi IMAIZUMI, Hiroshi SAITO, Takayuki SATO, Naoki KANO

    Radioisotopes   59 ( 6 )   379 - 386   2010.6

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    DOI: 10.3769/radioisotopes.59.379

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  • Kinetic Analysis of Reactivity of Benzaldehyde derivatives in the T-for-H Exchange Reaction Reviewed

    Yuki YAMAZAKI, Hiroshi IMAIZUMI, Naoki KANO

    Radioisotopes   59 ( 5 )   311 - 318   2010.5

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    In order to clarify the effect of tritium(<SUP>3</SUP>H or T)on both the ecosystem and the reactivity of compounds including H atom(s), the hydrogen-isotope exchange reaction (T-for-H exchange reaction) between each benzaldehyde derivative and tritium-labeled poly (vinyl alcohol) was observed in the range of 50 to 90°C. As a result, the radioactivity of the compounds increased with the reaction time. Applying the A"-McKay plot method to the observed data, the rate constants(k) of the functional group in each compound were obtained. Comparing these k with each other, the following six matters have been clarified in the reaction. (1)The reactivity of benzaldehyde derivatives depends on temperature. (2)The order of the temperature dependence in the reactivity of the fluorobenzaldehyde tends to o-substitute > m-substitute > p-substitute, and that in the reactivity of the chlorobenzaldehyde tends to m-substitute > o-substitute > p-substitute. (3)The order of reactivity in each chlorobenzaldehyde derivatives tends to o-position > m-position > p-position. (4)The reactivity of the formyl group in the benzaldehyde derivative can be estimated by applying both the A"-McKay plot method and the Hammett rule. (5)The method used in this work is useful for evaluating the influence of T on environment.

    DOI: 10.3769/radioisotopes.59.311

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  • Characteristics of oxygen stable isotopic ratio in precipitations in Niigata Prefecture, Japan「"jointly worked"」 Reviewed

    Chong LI, Naoki KANO, Yuichi UENO, Mitsuru HANABUSA, Yurong JIAO, Hiroshi IMAIZUMI, Naoki WATANABE

    Radioisotopes   59 ( 2 )   93 - 102   2010.2

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    DOI: 10.3769/radioisotopes.59.93

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  • Biosorption of Lanthanides from Aqueous Solutions Using Pretreated Buccinum tenuissimum Shell Biomass Reviewed

    Yusuke Koto, Naoki Kano, Yudan Wang, Nobuo Sakamoto, Hiroshi Imaizumi

    BIOINORGANIC CHEMISTRY AND APPLICATIONS   2010   2010

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    Biosorption experiment from aqueous solutions containing known amount of rare earth elements (REEs) using pre-treated Buccinum tenuissimum shell was explored to evaluate the efficiency of shell biomass as sorbent for REEs. In this work, four kinds of sieved shell samples: (a) "Ground original sample", (b) "Heat-treatment (480 degrees C, 6 hours) sample", (c) "Heat-treatment (950 degrees C, 6 hours) sample" and (d) "Heat-treatment (950 degrees C, 6 hours) and water added sample" were used. Furthermore, to confirm the characteristics of the shell biomass, the crystal structure, the surface morphology, and the specific surface area of these shell samples were determined. Consequently, the following matters have been mainly clarified. (1) The crystal structure of the shell biomass was transformed from aragonite (CaCO(3)) into calcite (CaCO(3)) phase by heat-treatment (480 degrees C, 6 hours); then mainly transformed into calcium oxide (CaO) by heat-treatment (950 degrees C, 6 hours), and calcium hydroxide (Ca(OH)(2)) by heat-treatment (950 degrees C, 6 hours) and adding water. (2) The shell biomass showed excellent sorption capacity for lanthanides. (3) Adsorption isotherms using the shell biomass can be described by Langmuir and Freundlich isotherms satisfactorily for lanthanides except "heat-treatment (950 degrees C, 6 hours) sample". (4) Shell biomass (usually treated as waste material) can be an efficient sorbent for lanthanides in future.

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  • Behavior and Distribution of Rare Earth Elements, Thorium and Uranium in Soil Environment「"jointly worked"」 Reviewed

    Naoki KANO, Toshiyuki TSUCHIDA, Nobuo SAKAMOTO, He LU, Yoshikazu NISHIMURA, Daichi OGURA, Hiroshi IMAIZUMI, Lidi GAO

    Radioisotopes   58 ( 11 )   727 - 741   2009.11

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  • Effects of Magnetic Field and Temperature on the Tritium Separation Factor under the SPE Electrolysis["jointly worked"] Reviewed

    Yosuke TAKAHASHI, Yoshifumi SEKIYA, Hiroshi IMAIZUMI, Masaaki SAITO, Satoshi FUKUI, Naoki KANO

    58 ( 7 )   469 - 475   2009.7

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    DOI: 10.3769/radioisotopes.58.469

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  • Speciation analysis of chromium in environmental waters in Niigata Prefecture by applying size fractionation and ion-exchange methods 「(共著)」 Reviewed

    LU He, JIAO Yurong, KANO Naoki, IMAIZUMI Hiroshi

    Journal of Ecotechnolgy Research   14 ( 4 )   239 - 246   2009.6

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    Speciation analysis of Cr in some environmental waters in Niigata Prefecture was performed by applying size fractionation and ion-exchange methods. Moreover, the concentration of humic substances was also determined for investigating the relationship between the concentration of humic substances and the speciation of Cr in environmental waters. The experiments yielded the following results: (1) Roughly 50-80 % of total Cr is present in the "dissolved" in normal weather condition. (2) In case of lagoon water samples, the distribution percentage of Cr in the "suspended" (the fraction left on 0.45μm filter when filtrating sample water) or "colloidal" (the fraction left on 0.1μm filter, although passing through 0.45μm filter) is generally large compared to that of river water samples. (3) For all of the investigated water samples, the concentration of Cr (III) species is higher than that of Cr (VI) species. (4) The concentration of total Cr and the distribution percentage of "suspended" remarkably increases after rainfall event. (5) The order of the amount of humic substances in Sakata is LS1 (downstream point of Lower Lagoon (Shitakata)) › LS2 (conflux point of Lower Lagoon (Shitakata) and Upper Lagoon (Uwakata)) ›LS3 (spring water at shore of south area in Lower Lagoon (Shitakata)); and the average concentration of humic substances is about 10ppm.

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  • Kinetic analysis of the Reactivity of Aromatic Amino Acids in the T-for-H Exchange Reaction Reviewed

    YOSHIDA A.

    Radioisotopes   58 ( 4 )   121 - 128   2009.4

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    DOI: 10.3769/radioisotopes.58.121

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  • Decentralization Treatment of Papermaking Wastewater by a Sequential Biological Fluidized Bed Reviewed

    Xu Gongdi, Li Chong, Imaizumi Hiroshi, Kano Naoki, Chen Jihua

    PROGRESS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY, VOL II, PTS A AND B   1635 - 1640   2009

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    In the present work, the papermaking wastewater was treated by combing fluidized bed biological reactor (FBBR) with sequential batch reactor technology (SBR). Particular attention was paid to the acclimation process, then confirmed the optimal operation, which consisted of 6 h cycle including an inflow process, 6 h aeration process, 2 h settling process, 2 h drainage process and 6h idle process. Under these conditions, COD(Cr) removal efficiency reached 94.4%, NH(3)-N concentration were reduced to 5 mg/L from 30 mg/L,maximal removal efficiencies of color and SS were obtained as 91.7% and 86.0%, respectively. Most of toxic organic substances were eliminated at shorter operational time. The study suggests that the combined sequential batch reactor technology with fluidized bed biological reactor is a potential alternative for papermaking wastewater treatment.

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  • Determination of rare earth elements, thorium and uranium in seaweed samples on the coast in Niigata Prefecture by inductively coupled plasma mass spectrometry Reviewed

    Nobuo Sakamoto, Naoki Kano, Hiroshi Imaizumi

    APPLIED GEOCHEMISTRY   23 ( 10 )   2955 - 2960   2008.10

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    The determination of rare earth elements (REEs), Th and U in seaweeds of various species and in ambient surface seawater were performed by inductively coupled plasma mass spectrometry. The seaweeds and the seawater samples were collected at 10 different coastal areas of Niigata Prefecture in Japan twice a year (spring and autumn) in 2004 and 2005. Results showed that concentration of REEs in seaweed species from Niigata Prefecture were about 103 times higher than those in seawater, and the enrichment factors of REEs were larger in heavy REE than light REE. A significant concentration difference of REEs, Th and U was found among species even in the same phylum. Undaria pinnatifida had the highest concentration of U. Considering that U. pinnatifida has low concentrations of REEs among typical brown algae, different REEs and U uptake mechanisms are suggested. The concentration of REEs, Th and U did not vary remarkably between sampling points and/or seasons. (c) 2008 Elsevier Ltd. All rights reserved.

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  • Environmental characteristics of lagoon waters in Niigata Prefecture based on oxygen stable isotopic ratio and the concentrations of dissolved materials Reviewed

    He LU, Naoki KANO, Yoshie YASHIMA, Yoshiyuki AMANO, Chong LI, Hiroshi IMAIZUMI, Naoki WATANABE, Yongjie ZHENG

    Radioisotopes   57 ( 7 )   2008.7

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  • 降水中におけるトリチウムとカルシウムイオンとの間の濃度相関性 Reviewed

    高橋優太, 今泉 洋, 狩野直樹, 齋藤正明, 加藤徳雄, 石井吉之, 齋藤圭一

    Radioisotopes   57 ( 6 )   375 - 383   2008.6

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  • T-for-H交換反応における安息香酸誘導体の速度論的反応解析 Reviewed

    澤田佳則, 今泉 洋, 狩野直樹

    Radioisotopes   57 ( 4 )   2008.4

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  • Biosorption of Uranium and Rare Earth Elements Using Biomass of Algae Reviewed

    Nobuo Sakamoto, Naoki Kano, Hiroshi Imaizumi

    BIOINORGANIC CHEMISTRY AND APPLICATIONS   2008

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    In order to investigate the behavior of rare earth elements (REEs) and uranium (U) in marine organism, the concentrations of REEs and U in some brown algae samples taken on the coast of Niigata Prefecture were determined. In addition, laboratory model experiment to uptake these elements using living and dried algae (Undaria pinnatifida and Sargassum hemiphyllum) was also carried out to survey the uptake and bioaccumulation mechanism of REEs and U in algae. Consequently, the following matters have been mainly clarified. (1) The order of the concentration of REEs for each organ in Sargassum hemiphyllum is "main branch" &gt; "leaf" &gt; "vesicle," however for U, the order is "leaf " &gt; "vesicle" &gt; " main branch." (2) The concentration of REEs in Sargassum hemiphyllum may be strongly affected by suspended solid in seawater. (3) The uptake and/or accumulate mechanism of REEs in brown algae may be different from that of U. Copyright (C) 2008 Nobuo Sakamoto et al.

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  • Kinetic Analysis of the Reactivity of Aliphatic Cyclic Alcohols and Carboxylic Acids in the T-for-H Exchange Reaction

    TAMURA Kiyoshi, IMAIZUMI Hiroshi, KANO Naoki

    RADIOISOTOPES   56 ( 10 )   593 - 603   2007.10

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    <I>In order to quantitatively evaluate the influence of tritium </I> (<SUP>3</SUP>H <I>or</I> T) <I>on various functional groups in environment, the hydrogen isotope exchange reaction</I> (T<I> for</I>-H<I> exchange reaction) between tritium-labeled poly (vinyl alcohol) and each aliphatic cyclic alcohol (or carboxylic acid) has been dynamically observed in the range of 50 to 90°C. Consequently, the activities of the aliphatic cyclic alcohol and carboxylic acid increased with increasing reaction time. Applying the A″-McKay plot method to the observed data, the rate constants (k) for these materials were obtained. Using the k, the relation between the number of carbon atoms in the ring in each alcohol and the reactivity of the alcohol was quantitatively compared. Then, to clarify the effect of relative atomic charge of</I> O <I>atom (connected with the </I>H <I>atom in the hydroxy (or carboxy) group in the material) on the reactivity of the material, the </I>MOPAC<I> method was used.</I><BR><I>From both the above-mentioned and the obtained previously, the following nine items were found as to aliphatic cyclic alcohols (and carboxylic acids) in the </I>T<I>-for-</I>H <I>exchange reaction. (1) The reactivity of aliphatic cyclic alcohols (and carboxylic acids) depends on the temperature. (2) The reactivity of the cyclic materials decreases with increasing number of carbon atoms in the ring. (3) The reactivity of the aliphatic cyclic carboxylic acid seems to be smaller than that of aliphatic cyclic alcohol, and be larger than that of aliphatic cyclic amine. (4) For aliphatic cyclic alcohols, correlation exists between k and relative atomic charges of</I> O<I> atom obtained by the </I>MOPAC<I> method, but the tendency for aliphatic cyclic carboxylic acid is not clear. (5) As to having the same number of carbon atoms in each ring, the reactivity of the aliphatic cyclic carboxylic acid including the side chain is smaller than of the aliphatic cyclic carboxylic acid including no side chain. (6) The reactivity of aliphatic cyclic carboxylic acid is larger than that of aliphatic normal carboxylic acid. (7) The reactivity of these materials dissolved in 1, 4-dioxane is smaller than that in p-xylene. (8) Using both the </I>MOPAC<I> and the A″-McKay plot methods, the actual analysis of aliphatic cyclic alcohols can be more possible. (9) The method used in this work is useful for evaluating influence of</I> T<I> on environment.</I>

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  • Study on Reduction of Chromium Using Humic Substances and Clay Minerals Reviewed

    KANO Naoki, OTSUKI Yusuke, LU He, IMAIZUMI Hiroshi

    Journal of Ecotechnology Research   13 ( 2 )   79 - 84   2007.8

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    In this study, laboratory model experiments on the interactions of Cr with natural ecological restoration substances were carried out to estimate optimum conditions for the reduction of Cr in soils and/or waters. For natural ecological restoration substances, humic substances (humic acid and fulvic acid) and clay minerals (bentonite and imogolite) were used. The experiments, performed at pH 4-8, yielded the following results: (1) Cr(VI) was reduced to Cr(III) by the humic substances; moreover, the reduction ability of the humic substances decreased with increasing pH. (2) The complexation of Cr(III) proceeded faster than the reduction of Cr(VI) and reached a maximum at pH 5. (3) Cr(III) was best removed at pH 4 and 5 by bentonite, but the removal ratio decreased with increasing pH. Furthermore, the removal effect of bentonite decreased with the addition of a humic substance. (4) While Cr(VI) was never removed by bentonite, the removal was slightly improved by the addition of a humic substance and an increase in pH. (5) An effect of imogolite on the removal of Cr(VI) was observed at pH 4 and 5. Reaching a maximum at pH 4, the effect was not indicated at pH 6-8.

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  • Determination and the behavior of polycyclic aromatic hydrocarbons (PAHs) in air and in precipitation Reviewed

    Kousuke Oura, Hitoshi Murayama, Hiroaki Yagoh, Naoki Kano, Hiroshi Imaizumi

    Journal of Environmental Chemistry   17 ( 2 )   205 - 216   2007.6

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  • Behavior of environmental pollutants and water quality assessment in lagoon waters in Niigata Prefecture Reviewed

    Annual report of the Institute of Environmental Geological Sciences   ( 18 )   29 - 38   2007.4

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  • Simultaneous Analysis of Reactivity of L-Cysteic Acid or L-Cysteine Having Three Different Kinds of Functional Groups Reviewed

    IMAIZUMI Hiroshi, NAGASAWA Satoshi, KANO Naoki

    RADIOISOTOPES   55 ( 12 )   709 - 718   2006.12

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    <I>In order to clarify both the effect of tritium</I> (<SUP>3</SUP>H <I>or</I> T) <I>on the ecosystem and the reactivity of materials having</I> H <I>atoms, the reactivity of L-cysteic acid (or L-cysteine) having three different kinds of functional groups was studied. The hydrogen-isotope exchange reaction between each compound and</I> HTO <I>vapor</I> (T-<I>for</I>-H <I>exchange reaction) was observed at 50-70°C, and the reaction was analyzed with both the A″-McKay plot method and the data obtained from the exchange reaction. The following seven matters have been consequently found in the</I> T-<I>for</I>-H <I>exchange reaction. (1) The reactivity of the functional groups in each compound increases with increasing temperature. (2) As to L-cysteic acid, the reactivity of</I> SO<SUB>3</SUB>H <I>group is 2.6 times greater than that of</I> COOH <I>one, and is 5.6 times greater than that of</I> NH<SUB>2</SUB> <I>one. (3) As to L-cysteine, the reactivity of</I> SH <I>group is 1.4 times greater than that of</I> COOH <I>one, and 3.5 times greater than that of</I> NH<SUB>2</SUB> <I>one. (4) The reactivity of</I> NH<SUB>2</SUB> <I>group progressed by the substituent having large electron-attractive effect, however, the reactivity of</I> COOH <I>group does not so progress by such a substituent. (5) Applying the A″-McKay plot method, the reactivity of the three functional groups in each aliphatic compound can be nondestructively and simultaneously clarified under the condition of non-masking reagent. (6) Degree of</I> T-<I>incorporation in a certain material can be nondestructively and quantitatively clarified. (7) The results obtained in this work is useful to prevent</I> T <I>contamination in the environment and to clarify the reactivity of the materials having plural functional groups, and the method used in this work can be also useful as a analytical method to obtain the reactivity of multi-functional groups in a certain compound.</I>

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  • Environmental characteristics of precipitations based on both oxygen stable isotopic ratio and concentration of rare earth elements (REEs), thorium (Th), uranium (U) in Niigata Prefecture Reviewed

    Naoki KANO, Takehiro KIKUCHI, Nobuo SAKAMOTO, Hiroshi IMAIZUMI, Hitoshi MURAYAMA, Hiroaki YAGOH, Tsuyoshi OHIZUMI

    Radioisotopes   55 ( 6 )   307 - 317   2006.6

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    DOI: 10.3769/radioisotopes.55.307

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  • T-for-H交換反応における種々の脂肪族ジアミンの反応性 Reviewed

    今泉 洋, 斎藤博美, 狩野直樹

    Radioisotopes   55 ( 4 )   183 - 190   2006.4

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  • 酸素安定同位体比および希土類元素濃度から見た新潟県の降水の特徴 Reviewed

    狩野直樹

    財団法人 環境地質科学研究所 研究年報   ( 17 )   51 - 62   2006.4

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  • Study on the behavior of pollutants in lagoon waters in Niigata Prefecture, Japan Reviewed

    Naoki Kano, Yongjie Zheng, He Lu, Masaru Tazawa, Yoshie Yashima, Takeshi Koyama, Hiroshi Imaizumi

    Geophysical Solutions for Environment and Engineering, Vol 1 and 2   Vol. 2   802 - 806   2006

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    In order to reveal the quality and characteristics of lagoon waters in Niigata Prefecture in recent years, and to investigate the behavior of the pollutants in lagoon waters, dissolved organic carbon (DOC), complexing capacity, the concentration of major ions and oxygen stable isotopic ratios (i.e., delta O-18) in some lagoon water samples in Niigata Prefecture were measured. Moreover, pH and electric conductivity (EC), dissolved oxygen (DO) and water temperature were measured in the field. Lagoon water samples were usually monthly taken from 2004 to 2006 at the fixed sampling point from 2 lagoons (i. e. Sakata and Toyanogata) in Niigata Prefecture.
    Consequently, the following matters have been mainly clarified. (1) 6180 values of lagoon water samples is generally larger than that of river water samples. In particular, delta 1(8)O values in Sakata lagoon increase remarkably in summer. It can be closely related to the activity of Crustacea plankton as well as due to the effect of the supply of groundwater. (2) The values of DO and DOC of water samples in Sakata increase in summer. It might be attributable to the photosynthesis of aquatic plants. For the same reason, it can be considered that the complexing capacity of the samples in Sakata also increases in summer. (3) The relationship between delta O-18 values and the concentration of HCO3- can be a good indicator for the degree of the inflow from groudwaters to lagoon under the same geological condition. (4) The relationship between delta O-18 values and the DOC was relatively good in the water samples in Sakata.

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  • Isotopic, chemical characteristics and water quality of lagoon and river-water samples in Niigata Prefecture, Japan Reviewed

    M Tazawa, N Kano, H Imaizumi

    BUNSEKI KAGAKU   54 ( 9 )   789 - 798   2005.9

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    The monitoring and determination of pollutants in environmental water is very significant from the viewpoint of environmental protection. In this study, the objective was to reveal the quality and characteristics of environmental water samples from Niigata Prefecture in recent years, and to establish a new evaluation method for the behavior of environmental water. For the above-mentioned purpose, the total organic carbon (TOC), chemical oxygen demand (COD), the concentration of major ions and oxygen stable isotopic ratios (i.e., delta(18)O) in some river water, lagoon water and groundwater samples in Niigata Prefecture were measured. Moreover, the water temperature, pH, electric conductivity (EC) and dissolved oxygen (DO) were measured in the field. River water, circumjacent groundwater (located near the river), and lagoon water samples were taken monthly at fixed sampling points from 4 rivers (i.e. Shinano River and its two branch streams, Agano River) and 2 lagoons (i.e. Sakata and Toyanogata) in Niigata Prefecture. Consequently, the following matters have been mainly clarified: (1) The relationship between TOC and COD serve as a useful tool for estimating the effect of mixing from other kinds of river-water systems. (2) The concentration of NO3- in water samples from Sakata was larger than those in other environmental water samples. Particularly, those of spring water in Sakata were 30 to 60 ppm throughout the year. (3) The relationship between the delta(18)O values and the TOC was relatively good in the water samples from Sakata. In a lagoon, such as Sakata (not suffering from the inflow of river waters), investigating delta(18)O values are of interest as one of the indices of organic pollutants (originated from plankton), as well as for characterizing the origin of local water. (4) The pH values of lagoon water samples were 8 to 9, and those of groundwater samples were 5 to 6. It is considered that lagoon water is supersaturated with oxygen, and groundwater is unsaturated.

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  • Kinetic Analysis of the Reactivity of Cycloamines in the T-for-H Exchange Reaction Reviewed

    IMAIZUMI Hiroshi, NAGASAWA Satoshi, SHINOHARA Yukihiko, KANO Naoki

    RADIOISOTOPES   54 ( 5 )   139 - 143   2005.5

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    <I>The hydrogen-isotope exchange reaction</I> (T-<I>for</I>-H <I>exchange reaction) between tritium-labeled poly (vinyl alcohol) and each cycloamine dissolved in 1, 4-dioxane has been observed at 50-90°C. Consequently, the quantitative relation was obtained between the reaction time and the increase in the tritium activity of the cycloamine. The reaction was dynamically analyzed with both the A''-McKay plot method and data observed. Moreover, in order to clarify the effect of the relative atomic charge of the</I> N <I>atom (in the amino group) on the reactivity of the cycloamine, the</I> MOPAC <I>method was introduced. As to cycloamine, the following three matters have been consequently found in the</I> T-<I>for</I>-H <I>exchange reaction: (1) the reactivity of each cycloamine decreases with increasing the number of carbon atoms in the ring of cycloamine, (2) the rate constant (k) for each cycloamine depends on the reaction temperature, (3) the correlation is found between the relative atomic charge of the</I> N <I>atom in the</I> NH<SUB>2</SUB> <I>group and k for the cycloamine.</I>

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  • Speciation analysis of chromium in environmental water samples from Niigata Prefecture by using ion-exchange ICP-AES Reviewed

    Y Iwasaki, N Kano, K Omori, H Imaizumi, T Ishizuka

    BUNSEKI KAGAKU   53 ( 9 )   1015 - 1019   2004.9

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    A simple and an efficient preconcentration method for the separate determination of each species of chromium {i.e., Cr(III) and Cr(VI)} in environmental water samples has been investigated, followed by inductively coupled plasma-atomic emission spectrometry (ICP-AES). This method is based on the following ion-exchange method. Cr(III) was adsorbed on cation-exchange resin, and Cr(VI) on anion-exchange resin. The retained Cr(III) and Cr(VI) were quantitatively eluted with 2 mol dm(-3) hydrochloric acid (HCl) and 2 mol dm(-3) potassium chloride (KCl), respectively. The preconcentration factor was 100 for Cr(III) and 300 for Cr(VI) in this work, and the detection limits were 0.03 mug dm in Cr(III) and 0.01 mug dm(-3) in Cr(VI). The method has been applied to environmental water samples from Niigata Prefecture. The recoveries of Cr(III) and Cr(VI) in environmental water samples were all 94similar to98%, and the effect of interference from the coexistence ion was not detected. Therefore, the above-mentioned method is applicable to environmental water samples.

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  • Environmental assessment of river water and groundwater in Niigata prefecture by using oxygen stable isotopic ratio and major ion concentration Reviewed

    Naoki KANO, Akihito SATO, Hiroshi IMAIZUMI

    RADIOISOTOPES   53 ( 7 )   415 - 425   2004.7

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    <I>To reveal the characteristics of environmental water in</I> Niigata Prefecture <I>in recent years, and to establish a new evaluation method for the behavior of the environmental water, oxygen stable isotopic ratios (i.e., </I> δ<SUP>18</SUP>O), <I>concentrations of major ions, </I> pH <I>and</I> EC <I> (electric conductivity) in water samples from several rivers and those from groundwater in</I> Niigata Prefecture <I>were measured. Isotopic measurements were performed with a stable isotope ratio mass spectrometer</I> (Micromass PRISM) . <I>Consequently, the following matters have been found. (1) The</I> δ<SUP>18</SUP>O <I>values of river waters in</I> Niigata Prefecture <I>are generally -11 ‰ to 10‰. (2) The</I> δ<SUP>18</SUP>O <I>values of groundwater in</I> Niigata Prefecture <I>are generally 1.5‰ higher than that of river waters and the variation is about ± 1 ‰ throughout the year. (3) The</I> δ<SUP>18</SUP>O <I>values and the conductivity of groundwater located in the downstream area are higher than those in the upstream throughout the year. (4) The concentrations of major ions of river waters were almost higher in summer and winter than those in spring. (5) The concentrations of major ions in groundwater were higher than those in river water. (6) The concentrations of major ions in river water tend to increase with the downstream from the upstream. (7) The relationship between the conductivity and</I> δ<SUP>18</SUP>O <I>values in river water was relatively close (i.e. The correlation coefficient between them is large) in the upstream area (by comparing with that in the downstream) .</I>

    DOI: 10.3769/radioisotopes.53.415

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  • Reactivity of Normal Chain Diols in T-for-H Exchange Reaction Reviewed

    H. Sakai, H. Imaizumi, T. Murata, N. Kano

    Radioisotopes   53 ( 2 )   71 - 75   2004.2

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    <I>In order to clarify the reactivity of normal chain diols, the hydrogen-isotope exchange reaction</I> (T-<I>for</I>-H <I>exchange reaction) between solid poly (vinyl alcohol) labeled with tritium and each normal chain diol dissolved in 1, 4-dioxane has been observed in the range of 30 to 70 °C (or 90 °C) . The observed data was analyzed with the A″-McKay plot method, and the following three matters are consequently found. (1) The greater the number of methylene groups in a diol is, the smaller is the reactivity of the diol. (2) A significant difference in the reactivity is found between diols having even number of methylene groups and those having odd number of ones, and the reactivity of the former is larger than that of the latter. (3) As to the ratio of the decrease of the reactivity of the diols having increasing number of methylene groups, the ratio of diols having even number of methylene groups is greater than the ratio of diols having odd number of ones.</I>

    DOI: 10.3769/radioisotopes.53.71

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  • Chemical Characteristics of Seaweed and Seawater Samples on the Coast in Niigata Prefecture in Recent Years from Rare Earth Elements Pattern Reviewed

    Naoki KANO, Yoshitaka AOYAGI, Kentaro MATSUI, Hiroshi IMAIZUMI

    Journal of Environmental Chemistry   13 ( 3 )   789 - 798   2003.9

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    In order to investigate the recent state of marine environment in Niigata Prefecture, to investigate the biological concentration in the ocean, and to investigate the behavior of rare earth elements (REEs) in the ocean, REEs in many kinds of seaweed samples as well as seawater samples in Niigata Prefecture were determined by inductively coupled plasma mass spectrometry (ICP-MS) .<BR>Seaweed and seawater samples were collected at 10 points on the coast in Niigata Prefecture (i.e., Sanpoku Town, Niigata City, Iwamuro Village, Izumozaki Town, Kashiwazaki City, Nou Town, Ryotu City, Aikawa Town, Sawata Town and Akadomari Village) from 2000 to 2002.<BR>The following points have been clarified by the present study. (1) The concentrations of REEs in the seaweed gathered on the coast in Niigata Prefecture were about 10<SUP>3</SUP> to 10<SUP>5</SUP> times higher than those in the seawater; and the enrichment factors of REEs is generally larger in HREE than LREE. (2) A large difference was found between REE pattern of the seaweed samples taken on the coast in Niigata Mainland and that on the coast in Sado Island. (3) The degrees of "positive Ce-anomaly in seaweed samples" and "negative Ce-anomaly in seawater samples" in Niigata Mainland were also larger than those in Sado Island. (4) Positive Gdanomaly (which seems to be an artificial origin) was found in REE patterns of some seawater samples. (5) REE pattern of seaweed and seawater samples may be an useful tracer of investigating the surrounding marine environment.

    DOI: 10.5985/jec.13.789

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  • Reactivity of Aliphatic Dicarboxylic Acids in Hydrogen-Isotope Exchange Reaction Reviewed

    D. Zhao, H. Imaizumi, T. Kato, H. Sakai, N. Kano

    Radioisotopes   52 ( 5 )   215 - 223   2003.5

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    <I>In order to reveal the reactivity of aliphatic dicarboxylic acids, the hydrogen-isotope exchange reaction </I> (T-<I>for</I>-H <I>exchange reaction) between poly (vinyl alcohol) labeled with tritium at hydroxy group and one of aliphatic dicarboxylic acids in 1, 4-dioxane has been observed in a liquid-solid system in the range from 30 to 90°C. It was consequently found that (1) the greater the number of methylene groups in a aliphatic dicarboxylic acid is, the smaller is the reactivity of the acid; (2) a large difference is found between the reactivity of acids having even numbers of methylene groups and those having odd numbers, and the reactivity of the former is generally larger than that of the latter; (3) relating to the decrease of the reactivity of the acids with increasing number of methylene groups, the rate of the decrease in the case of even numbers is smaller than in the case of odd ones; (4) the reactivity of aliphatic dicarboxylic acids in</I> T-<I>for</I>-H <I>exchange reaction is largely dependent on the configuration (e.g., cisoid or transoid) of the two</I> COOH <I>groups.</I>

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  • Oxygen Stable Isotopic Ratios of Precipitations and River Waters in Niigata Prefecture in Recent Years Reviewed

    Naoki KANO, Hiroyuki AIHARA, Ryo KOJIMA, Kayoko TAKEUCHI, Akihito SATO, Hiroshi IMAIZUMI

    RADIOISOTOPES   52 ( 2 )   65 - 80   2003.2

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    <I>Oxygen stable isotopic ratios </I> (δ<SUP>18</SUP>O) <I>of the precipitation and some river water samples in Niigata prefecture were measured from 1999 to 2002. Isotopic measurements were performed by a stable isotope ratio mass spectrometer. Consequently, the following matters were found. (1) The mean</I> δ<SUP>18</SUP>O <I>value of precipitations was -9‰, and the variation of ±7‰ was shown throughout the year. (2) All of 9 observation points, the seasonal behavior of isotopic ratio was similar to each other. (3) In June and January</I>, δ<SUP>18</SUP>O <I>value o f precipitations was small, and was large in August. (4) In January, the relationship between the temperature of observation points and</I> δ<SUP>18</SUP>O <I> values in precipitation was most remarkably found throughout the year. (5) The variation of</I> δ<SUP>18</SUP>O <I> values in precipitations in winter is smaller than that in the other seasons. (6) The mean</I> δ<SUP>18</SUP>O <I> value of river waters in Niigata prefecture was about -11‰ to -10‰, and the variation was not so large (±2‰) throughout the year. (7) </I> δ<SUP>18</SUP>O <I> values of river waters may vary when the melted snow or the precipitation flow into the rivers. (8) The variation of</I> δ<SUP>18</SUP>O <I> values in groundwater was smaller than that in river waters</I>.

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  • Reactivity of Benzenesulfonic Acids in the Hydrogen-Isotope Exchange Reaction Reviewed

    D. Zhao, H. Imaizumi, N. Kano

    Radioisotopes   52 ( 2 )   57 - 64   2003.2

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    <I>In order to reveal the reactivity of a functional group in an aromatic compound having two substituents in the aromatic ring, the hydrogen-isotope exchange reaction</I> (T-<I>for</I>-H <I>exchange reaction) between tritiated water vapor</I> (HTO <I>vapor) and 3-amino-4-methoxybenzenesulfonic acid (and 2-aminotoluene-5-sulfonic acid) was dynamically observed at 50°C (and 70°C) in a gas-solid system. Consequently, the specific activity of the acid increased with time, and it showed that the</I> T-<I>for</I>-H <I>exchange reaction occurred. Applying the A″-McKay plot method to the data observed, the rate constant of each functional group for the reaction was obtained. After the additive property of the Hammett's rule was applied to this work; the new substituent constants were obtained. From the above-mentioned, the following four items have been confirmed. (1) The reactivity of the functional groups can be dynamically analyzed, and the A″-McKay plot method is useful to analyze the reactivity. (2) The additive property of the Hammett's rule is applicable to quantitative comparison of the reactivity of the functional groups. (3) The reactivity of the functional groups can be simultaneously analyzed by using the A″-McKay plot method in the</I> T-<I>for</I>-H <I>exchange reaction. (4) The method used in this work is also useful for analyzing the reactivity of a certain material having some kinds of functional groups</I>.

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  • Effect of the Number of Methylene Groups in Aliphatic Dicarboxylic Acid on the Reactivity of the Material. Use of T-for-H Exchange Reaction. Reviewed

    IMAIZUMI Hiroshi, KATO Takehisa, ZHAO Dongyu, KANO Naoki

    RADIOISOTOPES   51 ( 6 )   244 - 248   2002.6

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    <I>Hydrogen-isotope exchange reaction</I> (T-<I>for</I>-H <I>exchange reaction) between</I> HTO <I>vapor and aliphatic dicarboxylic acid having different number of methylene groups with each other has been observed at 50°C. Consequently, the quantitative relation was obtained between the reaction time and the increase of the activity of aliphatic dicarboxylic acid. The reaction was dynamically analyzed with both the A″-McKay plot method and data obtained.<BR>As to aliphatic dicarboxylic acids, the following two matters have been consequently found : (1) as the reactivity of each material decreases with increasing the number of methylene groups in the material, the effect of the number of methylene groups per molecule on the reactivity of the material can be quantitatively evaluated, (2) using the A″-McKay plot method, the reactivity of solid organic compounds can be evaluated, nondestructively.</I>

    DOI: 10.3769/radioisotopes.51.244

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  • Determination of Rare Earth Elements in Seaweed and Seawater Samples on the coast in Niigata Prefecture by ICP-MS after Solvent Extraction Reviewed

    Naoki Kano, Yoshitaka Aoyagi, Hiroshi Imaizumi

    Analytical Sciences   17(Supplement)   i1011 - i1014   2001.12

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  • Ionizations of Acidic Compounds and Tritiated Water Reviewed

    Imaizumi Hiroshi, Kano Naoki

    Radioisotopes   50 ( 9 )   425 - 427   2001.9

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    DOI: 10.3769/radioisotopes.50.9_425

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  • Preliminary investigation of isotope hydrology of precipitations and river waters in Niigata Prefecture, Japan. Reviewed

    Naoki Kano, H. Aihara, R. Kozima, Hiroshi Imaizumi

    Proc. of 1st International Symposium on Isotopomers (ISI 2001 Yokohama)   1   323 - 330   2001.7

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  • Determination of Rare Earth Elements in Some Seaweed Samples on the Coast in Niigata Prefecture by Inductively Coupled Plasma Mass Spectrometry Reviewed

    Naoki KANO, Yoshitaka AOYAGI, Hiroshi IMAIZUMI

    Journal of Environmental Chemistry   11 ( 2 )   221 - 231   2001.6

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    In order to investigate the present state of marine environment in Niigata Prefecture, and to investigate the behavior of rare earth elements (REEs) in the ocean, REEs in many kinds of seaweed samples taken on the coast in Niigata Prefecture were determined by inductively coupled plasma mass spectrometry (ICP-MS) .<BR>Seaweed samples were taken at 10 spots on the coast in Niigata Prefecture including Sado Island on August, 2000. After decomposing the samples, REEs were separated by solvent extraction method.<BR>The following results are obtained. (1) Even in the same phylum (e.g., green algae, brown algae, or red algae), concentrations of REEs vary widely depending on the species of seaweed. (2) A large difference was found between REE patterns of the seaweed samples taken on the coast in Niigata Mainland and those on the coast in Sado Island. It shows that the surrounding marine environment seems to be an important factor for determining REE pattern as well as the species of seaweed. (3) As to REE pattern of some seaweed samples taken on the coast in Niigata Prefecture, Yb-anomaly was found as well as Ce-, and Eu-anomaly. (4) REE pattern of seaweed samples may be an useful tracer of investigating the surrounding marine environments.

    DOI: 10.5985/jec.11.221

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  • Simultaneous Analysis of the Reactivety of Trisubstituted Aromatic Compounds-Use of Hydrogen-Isotope Exchange in a Gas-Solid System- Reviewed

    IMAIZUMI Hiroshi, SAKAI Hideyuki, KANO Naoki

    RADIOISOTOPES   49 ( 6 )   285 - 291   2000.6

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    <I>In order to reveal the reactivity of each functional group in the compound having three functional groups per molecule, the hydrogen-isotope exchange reaction</I> (T-<I>for</I>-H <I>exchange reaction) between disubstituted phenol and tritiated water vapor</I> (HTO <I>vapor) was dynamically observed at 50, 60, and 70°C in a gas-solid system. The data obtained in the observation increased with increasing observed time, and it was found that</I> T-<I>for</I>-H <I>exchange reaction occurred. Applying the A″-McKay plot method to the data obtained, the reaction was dynamically analyzed. The rate constant (k) of each functional group for the reaction was consequently obtained. These k's obtained and k's obtained previously were compared with each other. When the additive property of the Hammett rule was applied to the k's obtained in this work, the new substituent constants were obtained. The new constants were fitted on the Hammett plot obtained previously. From the above-mentioned, the following five matters have been clarified. (1) The reactivity of different functional groups can be compared with each other by applying the method used in this work. (2) The reactivity of the functional groups can be dynamically analyzed, and the A″-McKay plot method is useful to analyze the reactivity. (3) The additive property of the Hammett rule, which is generally used in the field of organic chemistry in order to compare the chemical reactivity of organic materials, is applicable to quantitative comparison of the reactivity of the functional groups. (4) The reactivity of the functional groups can be simultaneously (and unchangeably) analyzed by using the</I> T-<I>for</I>-H <I>exchange reaction. (5) The method used in this work is useful to analyze the reactivity of a material having many kinds of functional groups.</I>

    DOI: 10.3769/radioisotopes.49.285

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  • Effect of temperature on HTO-dissociation determined by ion exchange resins Reviewed

    N Kano, D Arai, H Imaizumi

    ANALYTICAL SCIENCES   15 ( 11 )   1071 - 1076   1999.11

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    In order to reveal the effect of temperature on (i) the dissociation equilibrium of tritiated water (HTO water) and (ii) the reactivity of each anion-exchange resin, the OT-for-OH exchange reaction between each anion-exchange resin and HTO water was studied within the range of 20 degrees C to 80 degrees C in the equilibrium state. In addition, the apparent dissociation constant (pK') for each resin was estimated by the method of pH-titration. From the observation of the OT-for-OH exchange reaction between each of the following anion-exchange resins and HTO water, the next three items have been found: (1) in the case of acryl-type anion-exchange resin, the effect of temperature on OT-for-OH exchange reaction is larger than that on the reaction in the case of styrene-type one; (2) the radioactivity incorporated into weakly basic anion-exchange resin (OH--form) by the isotope exchange reaction is smaller than that into strongly basic one; (3) in the case of the weakly basic anion-exchange resin, the amount of radioactivity incorporated into Cl--form resin by the hydrolysis is larger than the amount of radioactivity incorporated into OH--form resin by the isotope exchange reaction.

    DOI: 10.2116/analsci.15.1071

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  • Tritium incorporation into functional materials by applying OT-for-OH exchange reaction Reviewed

    Naoki Kano, Hiroshi Imaizumi

    Biological Trace Element Research   71-72   509 - 518   1999

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    In order to reveal (1) the behavior of the tritium-labeled hydroxyl group (i.e., OT group) and (2) the effect of temperature on the dissociation equilibrium of tritiated water, the OT-for-OH exchange reaction in a homogeneous system was observed (1) using ion-exchange resins and HTO water, and (2) using hydrogen oxides and HTO water. Consequently, the following four conclusions were obtained: (1) The OT-for-OH exchange reaction occurred between each anion-exchange resin (or each metal hydroxide) and HTO water. (2) The higher the temperature is, the smaller the activity of both anion- exchange resin and metal hydroxide will be, and the activity of cation- exchange resin is large when the temperature is high. (3) The larger the degree of crosslinking in each Biorad AG1 resin is, the lower the activity of the resin will be. (4) The exchange rate for the OT-for-OH exchange reaction is small when the electronegativity of the metal ion in the metal hydroxide is large.

    DOI: 10.1007/BF02784239

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  • T-for-H exchange reaction between HTO vapor and two functional groups in an aromatic compound in a gas-solid system Reviewed

    H. Imaizumi, H. Sakai, N. Kano

    Journal of Radioanalytical and Nuclear Chemistry   241 ( 3 )   451 - 455   1999

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    The hydrogen-isotope exchange reaction (T-for-H exchange reaction) between HTO vapor and an aromatic compound having two different kinds of functional groups has been observed at several temperatures. The rate constant (k) for each functional group in the T-for-H exchange reaction was obtained by using both the A-MCKAY plot method and the data observed. Comparing these k with each other has led to the following four conclusions in the T-for-H exchange reaction. (1) The reactivity of both the COOH and OH groups increases with a rise in temperature. (2) As to the degree of the effect of the COOH group on the reactivity of monosubstituted phenols, the degree in p-hydroxybenzoic acid is greater than that in m-hydroxybenzoic acid. (3) The HAMMETT rule is useful for estimating the reactivity of a certain aromatic compound. (4) The A-MCKAY plot method is also useful not only investigating the reactivity of the compounds having one kind of functional group, but also doing the reactivity of the compounds having two different kinds of functional groups.

    DOI: 10.1007/BF02347196

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  • Tritium-Incorporation into Ethers in T-for-H Exchange Reaction Reviewed

    IMAIZUMI Hiroshi, KANO Naoki, HIRAMATSU Jou

    RADIOISOTOPES   47 ( 12 )   897 - 903   1998.12

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    <I>In order to reveal whether the</I>H<I>atom (s) directly bonded to carbon atom can participate in</I>T<I>for</I>-H<I>exchange reaction, the</I>T<I>for</I>-H<I>exchange reaction between an ether having normal chain (or cyclic) structure and a</I>T-<I>labeled compound was dynamically observed at the range of 30-80</I>°C<I>in the liquid-solid system. Each ether used includes an atom having lone pairs. In the exchange reaction, polyvinyl (vinyl alcohol) having</I>T-<I>labeled</I>OH<I>groups (i.e., </I>OT<I>group) was used as a solid sample material, and one of three ethers (tetrahydrofuran (THF), dibutylether (DBuEt), and diisopropylether (DIProEt) ) dissolved in p-xylene was used as a liquid sample material. The concentrations of the solutions were set at 2.0, 1.0 and 1.0</I>mol· dm<SUP>-3</SUP>, <I>respectively. Applying the A″-McKay plot method to the data obtained from the exchange reaction, the rate constant (k) for each ether in the reaction was calculated. Comparing the k thus obtained and k obtained previously, the following five have been clarified. (1) The</I>H<I>atom included in each ether can participate in the</I>T<I>for</I>-H<I>exchange reaction in contact with</I>T-<I>labeled compound. (2) Each ether can participate in the exchange reaction as well as the functional groups (e.g., </I>-OH, -SH, -NH<SUB>2</SUB>, -CHO, <I>etc.) included in materials. (3) The decreasing order of the reactivity of the ethers is (THF) > (DBuEt) > (DIProEt) . (4) The temperature dependence of the reactivity of each ether is fairly smaller than that of the compound having a functional group (e.g., phenol, thiophenol, aniline, or benzaldehyde, etc.) . (5) It can be presumed that the</I>H<I>atoms (included in the ethers) participating in the exchange reaction are the</I>H<I>atoms directly bonded to a-carbon in the ethers</I>.

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  • Chemical Characteristics of Acid Snow and Rain Reviewed

    Koichi Katoh, Yoji taguchi, Naoki kano, Kiyomichi Aoyama

    Proc. of International Congress of Acid Snow and Rain1997   38 - 42   1997.10

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  • Chromium isotopic composition of some chondritic meteorites Reviewed

    N. Kano, K. Yamakoshi, M. Imamura

    Antarct. Meteorites Research   10   313 - 333   1997.9

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    The Cr isotopic composition of primitive meteorites (acid-residue fractions) was studied. Five chondrites were analyzed in this work [Allende (CV3), Murchison (CM2), Nuevo Mercurio (H5), La Criolla (L6), Qingzhen (EH3)]. Although in most samples, no isotopic anomalies beyond the experimental errors could be detected, an elevated ^<54>Cr/^<52>Cr ratio was found in the acid-soluble fraction from Qingzhen. Moreover, ε^<53>Cr and ε^<54>Cr show an inverse correlation among the meteorites analyzed in this study, and the acid residues have larger ε^<54>Cr and smaller ε^<53>Cr values than do the acid-soluble fractions in Allende and Murchison. The enrichment of ^<54>Cr in the Qingzhen sample suggests that the ^<54>Cr heterogeneity due to stellar nucleosynthesis has remained in enstatite chondrite as well as carbonaceous chondrite. In addition, the inverse correlation of ε^<53>Cr and ε^<54>Cr detected in acid residue samples indicates that the high-temperature condensate contained more exotic ^<54>Cr. It is also suggested that the homogenization of Cr isotopes proceeded with time, and terminated within a relatively short time scale of less than 2-3 Ma.

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  • Isotope exchange between iron(II or III) hydroxide and HTO water in the equilibrium state Reviewed

    H. Imaizumi, N. Kano, M. Eguchi

    Journal of Radioanalytical and Nuclear Chemistry   224 ( 1-2 )   67 - 69   1997

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    Observing the OT-for-OH exchange reaction between iron(II or III) hydroxide and tritiated water (HTO) leads to the following results: (1) isotope exchange as 'atomic group' occurred between the OH group in each iron hydroxide (i.e., Fe(OH)2 or Fe(OH)3) and OT- resulted from the dissociation of HTO
    (2) the ratio of the reactivity of the hydroxides is roughly [iron(III) hydroxide] : [iron(II) hydroxide] = 1.2 : 1.0 and the result is related to difference in electronegativity between Fe2+ and Fe3+. (In other words, if the reactivity depends on the number of the charge, the ratio should be 1.5 : 1.0).

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  • Effect of temperature (and the degree of crosslinking) on the reactivity of anion-exchange resins by applying the OT-for-OH exchange reaction Reviewed

    N Kano, D Arai, H Imaizumi

    RADIOCHIMICA ACTA   79 ( 3 )   195 - 198   1997

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    In order to reveal (i) the exchange ability of OT- resulting from the dissociation of HTO, (ii) the effect of temperature on the reactivity of anion-exchange resins, and (iii) the effect of the degree of crosslinking on the reactivity of the resins, the OT- for -OH exchange reaction between each OH--form anion-exchange resin and HTO water was observed in the equilibrium state. The anion-exchange resins used were Amberlite IRA-400, and Biorad AG1-X2, X4, X8. The temperature used was 20, 30, 40, 60, or 80 degrees C. The activity of each resin based on the OT-for-OH exchange reaction was measured with a liquid scintillation counter. Analyzing the data obtained, it was found that: (1) the higher the temperature is, the smaller is the activity of IRA-400 resin within the range of 40 similar to 80 degrees C; (2) the larger the degree of crosslinking in each Biorad AG1 resin, the lower the activity of the resin. Accordingly, it can be concluded that: (1) as for the dissociation of HTO at high temperature, the formula (HTO reversible arrow T+ + OH-) is more predominant than the formula (HTO reversible arrow H+ + OT-); (2) the resin with lower porosity (i.e., the resin having the larger degree of crosslinking) shows a lesser tendency for the OT-for-OH exchange reaction to occur than the resin with a higher porosity.

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  • Effect of the number of methylene groups per molecule on the reactivity of both amino and carboxyl groups in hydrogen-isotope exchange reaction Reviewed

    H Imaizumi, K Nishiwaki, N Kano

    RADIOCHIMICA ACTA   76 ( 4 )   201 - 204   1997

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    In order to reveal to what extent the number of methylene groups per molecule can have an effect on the reactivity of a material having two different kinds of functional groups, the hydrogen-isotope exchange reaction (T-for-H exchange reaction) between HTO vapor and one of aliphatic compounds having both COOH and NH, groups has been observed in the gas-solid system at a range of 50 similar to 80 degrees C. The rate constants for both COOH and NH2 groups in each material were obtained by applying the A ''-McKay plot method to the data observed. Comparing the rate constants has lead to the following three conclusions. (1) The reactivity of the two groups increases with a rise in temperature. (2) The greater the number of methylene groups is, the smaller the reactivity is of the material (i.e., the smaller the reactivity is of both the COOH and NH2 groups in the material). (3) The reactivity of certain aliphatic materials having two different kinds of functional groups can only be analyzed with the A ''-McKay plot method as well as certain aromatic materials having two different kinds of functional groups.

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  • Isotope exchange between alkaline earth metal hydroxide and HTO water in the equilibrium state Reviewed

    H. Imaizumi, J. Gounome, N. Kano

    Journal of Radioanalytical and Nuclear Chemistry   223 ( 1-2 )   23 - 26   1997

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    In order to reveal to what extent tritium (3H or T) can be incorporated into hydroxides, the isotope exchange reaction (OT-for-OH exchange reaction) between each alkaline earth metal hydroxide (M(OH)2), where M means alkaline earth metal (M = Ca, Sr or Ba) and HTO water was observed homogeneously at 30 °C under equilibrium after mixing. Consequently, the followings were obtained: (1) a quantitative relation between the electronegativity of each M ion and the ability (of the M ion) incorporating OT- into the M hydroxide can be found and the ability is small when the temperature is high, (2) the exchange rate for the OT-for-OH exchange reaction is small when the electronegativity of the M ion in the M hydroxide is great, (3) as for the dissociation of HTO water, it seems that formula (HTO⇆T+ + OH-) is more predominant than the formula (HTO⇆ + OT-) when the temperature is high and (4) the method used in this work is useful to estimate the reactivity of a certain alkaline material.

    DOI: 10.1007/BF02223358

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  • Effect of substituents on the reactivity of monosubstituted benzyl mercaptans in hydrogen-isotope exchange reaction Reviewed

    H Imaizumi, K Yamauchi, N Kano

    RADIOCHIMICA ACTA   79 ( 1 )   57 - 61   1997

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    In order to reveal to what extent each substituent of monosubstituted benzyl mercaptan can affect the reactivity of the material, the hydrogen-isotope exchange reaction (T-for-H exchange reaction) between one of monosubstituted benzyl mercaptans in a p-xylene solution and a poly(vinyl alcohol) labeled with tritium has been observed in a liquid-solid system at a range of 50 similar to 90 degrees C. The rate constants for the materials were obtained by applying the A "-McKay plot method to the data observed. Comparing the rate constants and the results obtained previously has led to the following three conclusions. (1) The reactivity of each monosubstituted benzyl mercaptan is somewhat affected by the type of substituent in the material, and by the reaction temperature. (2) The reactivity of monosubstituted benzyl mercaptans follows the Hammett rule, and is enhanced with one of the electron-attractive substituents. (3) The increasing order of the effect of the substituents on the reactivity of monosubstituted aromatic compounds is as follows: (monosubstituted thiophenol) &lt; (monosubstituted aniline) &lt; (monosubstituted benzyl mercaptan) &lt;(monosubstituted benzaldehyde) &lt; (monosubstituted benzylamine) &lt; (monosubstituted phenol).

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  • The Reactivity of Anion-Exchange Resins by Applying OT-for-OH Exchange Reaction in the Equilibrium State. Reviewed

    KANO Naoki, NIHEI Makoto, IMAIZUMI Hiroshi

    RADIOISOTOPES   45 ( 10 )   613 - 618   1996.10

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    <I>In order to reveal the behavior of hydroxyl group in isotope exchange reaction, </I> OT-<I>for</I>-OH <I>exchange reaction between each anion-exchange resin</I> (OH<SUP>-</SUP> <I>form) and tritiated water (abbreviated as</I> HTO <I>water below) was observed at 80°C under the equilibrium. Anion-exchange resins used were Amberlite IRA-400, IRA-410 (both strongly basic), and IRA-94S (weakly basic) . It can be thought that an</I> HTO <I>molecule dissociates into</I> H<SUP>+</SUP>+OT<SUP>-</SUP> (<I>or</I> T<SUP>+</SUP>+OH<SUP>-</SUP>) . <I>The activity of each resin based on</I> OT-<I>for</I>-OH <I>exchange reaction was measured with a liquid scintillation counter.</I><BR><I>From the above-mentioned, the following five were found. (1) Isotope exchange reaction as "atomic group" occurred between the</I> OH <I>group in each anion-exchange resin and the</I> OT <I>group in</I> HTO <I>water. (2) The reactivity of strongly basic anion-exchange resin is larger than that of weakly basic one. (3) The ratio of the reactivity of these resins can roughly be expressed as follows: (IRA-410) : (IRA-400) : (IRA-94S) =42: 7: 1. (4) The degree of</I> OT-<I>for</I>-OH <I>exchange reaction may be smaller than that of</I> T-<I>for</I>-H <I>exchange reaction. (5) The method used and results obtained in this work may be helpful to obtain the data for the prevention of</I> T-<I>contamination, especially to obtain the data from certain atomic groups including</I> T.

    DOI: 10.3769/radioisotopes.45.613

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  • The infrared spectra of diamond-like residues from the Allende meteorite

    C. Koike, N. C. Wickramasinghe, N. Kano, K. Yamakoshi, T. Yamamoto, C. Kaito, S. Kimura, H. Okuda

    Monthly Notices of the Royal Astronomical Society   277   986 - 994   1995.6

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  • Chemical and isotopic compositions in acid residues from three meteorites Reviewed

    Naoki KANO, Kazuo YAMAKOSHI, Hiroyuki MATSUZAKI, Ken’ichi NOGAMI

    Antarctic Meteorites Res.   6   325 - 337   1993.5

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  • Estimation of burnup in the Oklo natural nuclear reactor from ruthenium isotopic composition Reviewed

    H. Hidaka, N. Kano, A. Masuda

    Journal of Radioanalytical and Nuclear Chemistry Letters   155 ( 2 )   107 - 113   1991.9

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    Estimation of burnup in the Oklo natural reactor was based on Ru isotopic abundances determined by thermal ionization mass spectrometry. Nearly all Ru in the samples is fissiogenic, and burnup values calculated from101Ru,102Ru and104Ru isotope abundances are in good agreement with each other. The conversion factor of238U to235U was also determined using Ru isotope abundances. © 1991 Akadémiai Kiadó.

    DOI: 10.1007/BF02165064

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Books

  • Advanced Sorption Process Applications

    Kano, N, Zhang, S, edited, by Serpil Edebali( Role: Joint author)

    InTech  2019.4 

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    Total pages:205   Responsible for pages:165-183   Language:English Book type:Scholarly book

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  • Chitin-Chitosan - Myriad Functionalities in Science and Technology

    Naoki KANO, ed, by Rajendra, Sukhadeorao Dongre( Role: Joint author ,  Chapter 2 (pp. 19-44) "Carboxymethyl-chitosan cross-linked 3-aminopropyltriethoxysilane membrane for speciation of toxic chromium from water")

    In Tech.  2018.7  ( ISBN:9781789234060

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    Total pages:353   Responsible for pages:19-44   Language:English Book type:Scholarly book

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  • Biomass Production and Uses

    Naoki Kano, dite, y E. Jacob-Lopes, L. Q. Zepk( Role: Joint author ,  Chap. 4 (pp. 55-80) "Adsorption of Heavy Metal onto the Materials Prepared by Biomass")

    InTech  2015.10  ( ISBN:9789535121817

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    Total pages:106 pages   Responsible for pages:55-80   Language:English Book type:Scholarly book

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  • Biomass Now - Sustainable Growth and Use

    Naoki KANO, ed, by Miodrag, Darko Matovi( Role: Joint author ,  Chapter 4 (pp. 101-126) "Biosorption of Lanthanides Using Some Marine Biomasses")

    InTech  2013.4 

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    Total pages:540 pages   Responsible for pages:101-126   Language:English Book type:Scholarly book

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Presentations

  • 環境水中の重金属の動態および天然物質を用いた浄化・回収法の検討

    田辺国大, 吉村友樹, 荒谷朱美, 狩野 直樹, 今泉 洋

    日本分析化学会第60年会  2011.9 

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  • ファイトレメディエーションを用いた重金属汚染された水・土壌環境における浄化方法の検討

    佐藤 裕一, 安中 崇, 竹橋 央真, 狩野 直樹, 今泉 洋

    日本分析化学会第60年会  2011.9 

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  • T-for-H交換反応を用いた各種芳香族スルホン酸誘導体の速度論的反応解析

    西村啓成, 今泉 洋, 狩野直樹

    第48回アイソトープ・放射線研究発表会  2011.7 

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  • T-for-H交換反応を用いた異なる置換基を持つ種々のピリジン誘導体の速度論的反応解析

    佐藤貴之, 今泉 洋, 狩野直樹

    第48回アイソトープ・放射線研究発表会  2011.7 

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  • T-for-H交換反応を用いた各種脂肪族アミドの速度論的反応解析

    佐藤 淳, 今泉 洋, 狩野直樹

    第48回アイソトープ・放射線研究発表会  2011.7 

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  • T-for-H交換反応を用いた室温におけるCOOH基とNH2基の2段階同時解析

    片岡 憲昭, 今泉 洋, 狩野 直樹

    第48回アイソトープ・放射線研究発表会  2011.7 

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  • 土壌環境中における希土類元素,トリウム,ウランの存在形態と分布

    東平 吉正, 西村 孔一, 高立娣(Gao Lidi, 狩野 直樹, 今泉 洋

    第48回アイソトープ・放射線研究発表会  2011.7 

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  • Annual or seasonal variations of specific activity of tritium and of concentrations of major ions in precipitation in Niigata City

    Jiao Yurong, 石田さゆり, 柳 麻美, 今泉 洋, 狩野直樹, 斎藤正明, 加藤徳雄, 石井吉之

    第48回アイソトープ・放射線研究発表会  2011.7 

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  • Analysis of mechanism of the Biosorption of Rare Earth Elements Using Buccinum Tenussimum Shell Biomass International conference

    WANG Yudan, SAKAMOTO Nobuo, KOTO Yusuke, KANO Naoki, IMAIZUMI Hiroshi

    IUPAC International Congress on Analytical Sciences 2011 (ICAS2011)  2011.5 

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    Venue:Kyoto,Japan  

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  • Separation and Analysis of the Chemical Form of Metals in Sludge from Some Industry Water Treatment Plant International conference

    Gao Lidi, Nishimura Yoshikazu, Sato Yuichi, Higashidaira Yoshimasa, Kano Naoki, Imaizumi Hiroshi

    IUPAC International Congress on Analytical Sciences 2011 (ICAS2011)  2011.5 

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    Venue:Kyoto,Japan  

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  • Biosorption of REEs, Th and U Using Some Marine Biomasses International conference

    Naoki Kano, Chong Li, Nobuo Sakamoto, Yudan Wang, Hiroshi Imaizumi

    1st Annual World Congress of Marine Biotechnology (WCMB2011)  2011.4 

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    Venue:Dalian, China,  

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  • Behavior and Distribution of Metals in Soil Environment in Niigata and Yamagata Prefectures, Japan International conference

    GAO Lidi, NISHIMURA Yoshikazu, SATO Yuichi, HIGASHIDAIRA Yoshimasa, KANO Naoki, IMAIZUMI Hiroshi

    17th Asian Symposium on Ecotechnolgy (ASET17)  2010.11 

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    Venue:Kurobe, Japan  

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  • Biosorption of Rare earth elements (REEs) from Aqueous Solutions by Pretreated Shell and Thermodynamic and Kinetic Study on the absorption International conference

    WANG Yudan, SHIMA Shizuka, SAKAMOTO Nobuo, KANO Naoki, IMAIZUMI Hiroshi

    17th Asian Symposium on Ecotechnolgy (ASET17)  2010.11 

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    Venue:Kurobe, Japan  

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  • Evaluation of Comprehensive Water Quality and Protection Measures of Sakata Lagoon in Niigata Prefecture, Japan International conference

    LI Chong, TANABE Kunihiro, HARA Takayuki, ARAYA Akemi, KANO Naoki, IMAIZUMI Hiroshi, WATANABE Naoki, XU Gongdi

    17th Asian Symposium on Ecotechnolgy (ASET17)  2010.11 

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    Venue:Kurobe, Japan  

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  • ファイトレメディエーションによる土壌中の重金属(鉛,亜鉛,ヒ素)除去の検討

    佐藤 裕一, 安中 崇, 竹橋 央真, 狩野直樹, 今泉 洋

    日本分析化学会第59年会  2010.9 

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    Venue:仙台  

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  • ファイトレメディエーションを用いた土壌中の重金属除去の検討

    佐藤 裕一, 安中 崇, 竹橋 央真, 狩野 直樹, 今泉 洋

    第24回分析化学新潟地区部会研究発表会  2010.9 

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    Venue:新潟  

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  • T-for-H交換反応を用いたベンゼンスルホン酸誘導体の速度論的反応解析

    西村啓成, 今泉 洋, 狩野直樹

    第47回アイソトープ・放射線研究発表会  2010.7 

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    Venue:東京  

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  • T-for-H交換反応を用いた脂肪族アミノ酸の速度論的反応解析

    片岡憲昭, 今泉 洋, 狩野直樹

    第47回アイソトープ・放射線研究発表会  2010.7 

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    Venue:東京  

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  • 降水中のトリチウム濃度とカルシウムイオン濃度とを用いた気団動態の解析

    石田さゆり, 焦 玉荣(Jiao Yuron, 高田佳代子, 今泉 洋, 狩野直樹, 斎藤正明, 加藤徳雄, 石井吉之, 斎藤圭一

    第47回アイソトープ・放射線研究発表会  2010.7 

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    Venue:東京  

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  • トリチウムを追跡因子とした短期型降水の挙動

    Jiao Yurong, 高田佳代子, 石田さゆり, 今泉 洋, 狩野直樹, 斎藤正明, 加藤徳雄, 石井吉之, 斎藤圭一

    第47回アイソトープ・放射線研究発表会  2010.7 

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    Venue:東京  

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  • 強磁場下でのSPE電解濃縮におけるトリチウム分離係数への温度の影響

    高橋洋輔, 今泉 洋, 斎藤正明, 福井 聡, 佐藤孝雄, 狩野直樹

    第47回アイソトープ・放射線研究発表会  2010.7 

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    Venue:東京  

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  • 土壌環境中における希土類元素,トリウム,ウラン,重金属元素の動態

    西村孔一, Gao Lidi, 伊藤 亮, 佐藤裕一, 東平吉正, 狩野直樹, 今泉 洋

    第47回アイソトープ・放射線研究発表会  2010.7 

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    Venue:東京  

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  • 新潟県における降水の酸素安定同位体比および水質基礎項目との関連

    上野悠一, Li Chong, Jiao Yurong, 狩野直樹, 今泉 洋

    第47回アイソトープ・放射線研究発表会  2010.7 

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    Venue:東京  

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  • 硫酸銅五水和物の結晶水の挙動と構造解析へのトリチウムトレーサー法の適用

    佐藤徹也, 今泉 洋, 狩野直樹

    第47回アイソトープ・放射線研究発表会  2010.7 

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    Venue:東京  

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  • Study on the interaction between REEs and humic acid by applying both standard batch equilibration technique and WHAM VI model International conference

    LU He, KANO Naoki, IMAIZUMI Hiroshi, Zheng Yongjie

    16th Asian Symposium on Ecotechnolgy (ASET16)  2009.10 

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    Venue:Dalian, China  

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  • The characteristics of water pollution in Zhalong wetlands International conference

    ZHENG Yongjie, TIAN Jingzhi, LU He, KANO Naoki

    16th Asian Symposium on Ecotechnolgy (ASET16)  2009.10 

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    Venue:Dalian, China  

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  • Isotopic, chemical characteristics and water quality of Sakata Lagoon in Niigata Prefecture, Japan International conference

    Li Chong, KANEKO Hanae, KANO Naoki, IMAIZUMI Hiroshi, WATANABE Naoki, XU Gongdi

    16th Asian Symposium on Ecotechnolgy (ASET16)  2009.10 

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    Venue:Dalian, China  

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  • Biosorption of Rare earths elements (REEs), Thorium (U), Uranium (U) from Aqueous Solutions by Pretreated Buccinum tenuissimum Shell International conference

    WANG Yudan, KOTO Yusuke, SAKAMOTO Nobuo, KANO Naoki, IMAIZUMI Hiroshi

    16th Asian Symposium on Ecotechnolgy (ASET16)  2009.10 

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    Venue:Dalian, China  

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  • 土壌環境中における重金属元素の動態,および腐植物質との相互作用

    伊藤亮, 土田利幸, 西村孔一, 狩野直樹, 今泉 洋

    日本分析化学会第58年会  2009.9 

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    Venue:札幌  

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  • 新潟県の湖沼水における重金属元素の動態

    田辺国大, 廬 鶴, 李 冲, 狩野直樹, 今泉 洋

    日本分析化学会第58年会  2009.9 

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    Venue:札幌  

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  • 機能性薄膜による水質浄化システムの構築

    原 孝幸, 李 冲, 王 玉丹, 阿部明香, 狩野直樹, 今泉 洋

    日本分析化学会第58年会  2009.9 

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    Venue:札幌  

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  • 植物を用いた土壌・水環境中における重金属元素の浄化

    竹橋央真, 安中崇, 佐藤裕一, 狩野直樹, 今泉洋

    日本分析化学会第58年会  2009.9 

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    Venue:札幌  

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  • トリチウムトレーサー法を用いた硫酸銅の結晶水の安定性の解析

    佐藤徹也, 今泉 洋, 狩野直樹

    2009年支部合同新潟地方大会  2009.8  日本化学会関東支部・高分子学会北陸支部

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    Venue:新潟  

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  • 天然物質(ゼオライトや活性炭等)を用いた水中における環境汚染物質の除去・回収法の検討

    阿部明香, 李 冲(Li Chong, 今泉 洋, 狩野直樹

    2009年支部合同新潟地方大会  2009.8  日本化学会関東支部・高分子学会北陸支部

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  • 貝殻のバイオマスによる希土類元素(REEs), トリウム(Th), ウラン(U)の水溶 液中からの回収法の検討

    古藤 雄祐, 王 玉丹, 坂本 信生, 狩野 直樹, 今泉 洋

    2009年支部合同新潟地方大会  2009.8  日本化学会関東支部・高分子学会北陸支部

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  • 降水中のトリチウム濃度とカルシウムイオン濃度とを用いた季節別気団動態の解明手法へのアプローチ

    石田 さゆり, 焦, 玉荣(Jiao Yuron, 高橋優太, 高田佳代子, 今泉 洋, 狩野直樹, 斎藤正明, 加藤徳雄, 石井吉之, 斎藤圭一

    2009年支部合同新潟地方大会  2009.8  日本化学会関東支部・高分子学会北陸支部

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    Venue:新潟  

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  • 強磁場下でのSPE電解濃縮におけるトリチウム分離係数への電流と温度の影響

    高橋洋輔, 関谷喜史, 今泉 洋, 斎藤正明, 福井 聡, 佐藤孝雄, 狩野直樹

    2009年支部合同新潟地方大会  2009.8  日本化学会関東支部・高分子学会北陸支部

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    Venue:新潟  

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  • 磁場移動型キレート性陽イオン交換樹脂の製造

    吉田雅子, 後藤真也, 伊藤聡, 平野賢, 今泉洋, 福井聡, 狩野直樹

    2009年支部合同新潟地方大会  2009.8  日本化学会関東支部・高分子学会北陸支部

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    Venue:新潟  

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  • ファイトレメディエーションによる土壌中のヒ素・亜鉛除去の検討

    安中崇, 竹橋央真, 今泉 洋, 狩野直樹

    2009年支部合同新潟地方大会  2009.8  日本化学会関東支部・高分子学会北陸支部

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    Venue:新潟  

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  • T-for-H交換反応を用いたアミノ酸の速度論的反応解析とTaft式の利用

    片岡 憲昭, 吉田 陽, 今泉 洋, 狩野 直樹

    2009年支部合同新潟地方大会  2009.8  日本化学会関東支部・高分子学会北陸支部

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    Venue:新潟  

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  • 固―液系でのT-for-H交換反応の観測に基づくベンゼンスルホン酸誘導体の速度論的反応解析

    西村啓成, 山崎佑樹, 今泉 洋, 狩野直樹

    2009年支部合同新潟地方大会  2009.8  日本化学会関東支部・高分子学会北陸支部

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    Venue:新潟  

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  • 新潟県の近年における降水の同位体的・化学的特徴

    上野 悠一, 花房 充, 李 冲 (Li Chong, 焦 玉荣(Jiao Yurong, 狩野 直樹, 今泉 洋

    第46回アイソトープ・放射線研究発表会  2009.7 

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    Venue:東京  

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  • 海洋生物のバイオマスによる微量金属元素の回収法の検討

    古藤 雄祐, 王 玉丹, 坂本 信生, 狩野 直樹, 今泉 洋

    第46回アイソトープ・放射線研究発表会  2009.7 

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    Venue:東京  

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  • 降水中のトリチウム濃度とカルシウムイオン濃度とによる季節別気団動態の解明

    石田 さゆり, 焦, 玉荣(Jiao Yurong, 高橋優太, 今泉 洋, 狩野直樹, 斎藤正明, 加藤徳雄, 石井吉之, 斎藤圭一

    第46回アイソトープ・放射線研究発表会  2009.7 

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    Venue:東京  

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  • 強磁場下でのSPE電解濃縮におけるトリチウム分離係数への電流の影響

    高橋洋輔, 今泉 洋, 狩野直樹, 福井 聡, 斎藤正明

    第46回アイソトープ・放射線研究発表会  2009.7 

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    Venue:東京  

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  • 土壌環境中における金属元素の動態および腐植物質との相互作用

    西村 孔一, 土田 利幸, 伊藤 亮, 廬 鶴, 狩野 直樹, 今泉 洋

    第46回アイソトープ・放射線研究発表会  2009.7 

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    Venue:東京  

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  • T-for-H 交換反応によるベンズアルデヒド誘導体の速度論的反応解析

    山崎佑樹, 今泉 洋, 狩野直樹

    第46回アイソトープ・放射線研究発表会  2009.7 

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    Venue:東京  

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  • アミノ酸の速度論的反応解析とTaft式の利用

    片岡 憲昭, 吉田 陽, 今泉 洋, 狩野 直樹

    第46回アイソトープ・放射線研究発表会  2009.7 

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    Venue:東京  

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  • トリチウムトレーサー法を用いた硫酸銅の結晶水の挙動

    佐藤徹也, 今泉 洋, 狩野直樹

    第46回アイソトープ・放射線研究発表会  2009.7 

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    Venue:東京  

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  • Decentralization Treatment of Papermaking Wastewater by a Sequential Biological Fluidized Bed International conference

    XU Gongdi, LI Chong, IMAIZUMI Hiroshi, KANO Naoki

    International Symposium on Environmental Science and Technology (2009ISEST)  2009.6 

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    Venue:Shanghai, China  

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  • Environmental Characteristics of Lagoon Waters in Niigata Prefecture Based on the Concentrations of Nutrients,Heavy Metals and Dissolved material International conference

    LI Chong, LU He, ABE Asuka, KANEKO Hanae, Naoki KANO, IMAIZUMI Hiroshi

    15 th Asian Symposium on Ecotechnolgy (ASET15)  2008.10 

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    Venue:Kanazawa, Japan  

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  • Study on Water Quality Improvement for Removing Pollutant in Environmental Water International conference

    ABE Asuka, LU He, KANO Naoki, IMAIZUMI Hiroshi

    15 th Asian Symposium on Ecotechnolgy (ASET15)  2008.10 

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    Venue:Kanazawa, Japan  

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  • Study on the Reduction of Arsenic and Zinc from Soil by Phytoremediation International conference

    YASUNAKA Takashi, TAKEHASHI Chikamasa, KANO Naoki, IMAIZUMI Hiroshi

    15 th Asian Symposium on Ecotechnolgy (ASET15)  2008.10 

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    Venue:Kanazawa, Japan  

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  • Speciation Analysis of Chromium in Environmental Waters in Niigata Prefecture by Applying Size Fraction and Ion-exchange Methods International conference

    LU He, JIAO Yurong, KANO Naoki, IMAIZUMI Hiroshi

    15 th Asian Symposium on Ecotechnolgy (ASET15)  2008.10 

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    Venue:Kanazawa, Japan  

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  • マグネタイト含有陰イオン交換樹脂の合成と評価

    平野賢, 青山真理, 今泉洋, 福井聡, 狩野直樹

    第22回日本分析化学会関東支部新潟地区部会研究発表会  2008.9 

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  • 土壌環境中におけるランタノイド,クロム,亜鉛等重金属元素の動態

    伊藤亮, 土田利幸, 狩野直樹, 今泉 洋

    日本分析化学会第57年会  2008.9 

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    Venue:福岡  

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  • 海洋生物による微量金属元素の生体濃縮

    古藤 雄祐, 坂本 信生, 狩野 直樹, 今泉 洋

    第45回アイソトープ・放射線研究発表会  2008.7 

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    Venue:東京  

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  • 新潟県における湖沼の同位体・化学的特徴 ~降水が湖沼の水質に与える影響~

    金子華江, 廬 鶴, 李 冲, 高野美穂, 狩野直樹, 今泉 洋

    第45回アイソトープ・放射線研究発表会  2008.7 

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    Venue:東京  

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  • SPE電解濃縮法におけるトリチウム分離係数への磁場の強さ(及び温度)の影響

    関谷喜史, 高橋洋輔, 吉田 陽, 今泉 洋, 狩野直樹, 福井 聡, 斎藤正明

    第45回アイソトープ・放射線研究発表会  2008.7 

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    Venue:東京  

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  • T-for-H 交換反応における芳香族ベンズアルデヒドの速度論的反応解析

    山崎佑樹, 今泉 洋, 狩野直樹

    第45回アイソトープ・放射線研究発表会  2008.7 

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    Venue:東京  

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  • T-for-H交換反応を用いたアミノ酸の速度論的反応解析

    吉田 陽, 今泉 洋, 佐藤貴之, 狩野直樹

    第45回アイソトープ・放射線研究発表会  2008.7 

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    Venue:東京  

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  • 酸素安定同位体比および後方流跡線解析から見た新潟県における降水の化学的特徴

    花房 充, 李 冲, 狩野直樹, 今泉 洋

    第45回アイソトープ・放射線研究発表会  2008.7 

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    Venue:東京  

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  • T-for-H交換反応におけるベンズアルデヒド誘導体の速度論的反応解析

    山崎佑樹, 今泉 洋, 狩野直樹

    日本原子力学会関東・甲越支部第1 回学生研究発表会  2008.3 

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  • Biosorption of Uranium and Rare Earth Elements Using Biomass of Algae International conference

    Nobuo SAKAMOTO, Naoki KANO, Hiroshi IMAIZUMI

    The 10th Eurasia Conference on Chemical Sciences (EuAs C2S-10)  2008.1 

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    Venue:Manila, Philippines  

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  • 降水中トリチウムでみる日本近辺の気団動態

    高橋優太, 今泉洋, 狩野直樹, 斎藤正明, 加藤徳雄, 石井吉之, 斎藤圭一

    日本原子力学会関東・甲越支部第6回若手研究者発表討論会  2007.10 

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  • T-for-H交換反応における安息香酸誘導体の速度論的反応解析

    澤田佳則, 今泉 洋, 狩野直樹

    日本原子力学会関東・甲越支部第6回若手研究者発表討論会  2007.10 

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  • Laboratory Model Experiments for the Reduction of Cr(VI) Using Natural Ecological Restoration Substances such as Eichhornia crassipes International conference

    KANO Naoki, OTSUKI Yusuke, LU He, IMAIZUMI Hiroshi

    14th Asian Symposium on Ecotechnolgy (ASET14)  2007.10 

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    Venue:Kyung-Hee University, Korea  

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  • Behhavior and Uptake of Rare Earth Elements and Uranium in Seaweed International conference

    SAKAMOTO Nobuo, KANO Naoki, LU He, IMAIZUMI Hiroshi

    14th Asian Symposium on Ecotechnolgy (ASET14)  2007.10 

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    Venue:Kyung-Hee University, Korea  

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  • 土壌環境中における希土類元素,トリウム,ウランの動態

    土田利幸, 狩野直樹, 廬 鶴, 小倉大知, 今泉 洋

    第44回アイソトープ・放射線研究発表会  2007.7 

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  • 新潟県における降水の酸素安定同位体比および化学分析

    花房 充, 狩野直樹, 今泉 洋

    第44回アイソトープ・放射線研究発表会  2007.7 

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  • T-for-H交換反応における安息香酸誘導体の反応性

    澤田佳則, 今泉 洋, 狩野直樹

    第44回アイソトープ・放射線研究発表会  2007.7 

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  • T-for-H交換反応を用いた異なる3種類の官能基を持つ物質の速度論的反応解析

    吉田 陽, 橋詰陽介, 今泉 洋, 狩野直樹

    第44回アイソトープ・放射線研究発表会  2007.7 

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  • 新潟県における湖沼・河川水の環境汚染物質の動態評価

    天野義之, 狩野直樹, 田澤 勝, 小山 威, 今泉 洋

    第44回アイソトープ・放射線研究発表会  2007.7 

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  • 天然物質(フミン物質,粘土鉱物,植物)を用いた自然環境中におけるクロム低減化の検討

    大槻佑輔, 狩野直樹, 今泉 洋

    第68回分析化学討論会  2007.5 

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    Venue:宇都宮  

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  • 新潟県における湖沼中の環境汚染物質の動態

    小山 威, 狩野直樹, 天野義之, 廬 鶴, 今泉 洋

    第68回分析化学討論会  2007.5 

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    Venue:宇都宮  

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  • Study on the Reduction of Chromium Using Humic Substance and Clay Minerals International conference

    KANO Naoki, OTSUKI Yusuke, LU He, IMAIZUMI Hiroshi

    13th Asian Symposium on Ecotechnolgy (ASET13)  2006.12 

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    Venue:Toyama, Japan  

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  • フミン物質および粘土鉱物を用いた土壌中のクロム低減化の検討

    大槻佑輔, 狩野直樹, 今泉 洋

    第20回分析化学新潟地区部会研究発表会  2006.9 

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  • T-for-H交換反応における脂肪族環状カルボン酸の速度論的反応解析

    田村 潔, 今泉 洋, 狩野直樹

    第43回アイソトープ・放射線研究発表会  2006.7 

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  • T-for-H交換反応におけるm-ヒドロキシ安息香酸の反応性

    添野忠宏, 今泉 洋, 佐竹徹哉, 狩野直樹

    第43回アイソトープ・放射線研究発表会  2006.7 

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  • 酸素安定同位体比およびアルカリ度を用いた河川・湖沼水の動態 ~降水による周辺土壌からの影響~

    八嶋由枝, 田澤 勝, 狩野直樹, 今泉 洋

    第43回アイソトープ・放射線研究発表会  2006.7 

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  • 海藻中の希土類元素,トリウム,ウラン濃度から見た元素摂取および生態濃縮機構の検討

    坂本信生, 狩野直樹, 今泉 洋, 加藤健二

    第43回アイソトープ・放射線研究発表会  2006.7 

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  • 大気・降水中に含まれる多環芳香族炭化水素類の挙動と発生源の推定

    大浦孝祐, 狩野直樹, 村山 等

    第15回環境化学討論会  2006.6 

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    Venue:仙台  

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  • Study on the Behavior of Pollutants in lagoon waters in Niigata Prefecture, Japan International conference

    Naoki KANO, Yongjie ZHENG, He LU, Masaru TAZAWA, Yoshie YASHIMA, Takeshi KOYAMA, Hiroshi IMAIZUMI

    2nd International Conference on Environmental and Engineering Geophysics (ICEEG2006)  2006.6 

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    Venue:Wuhan, China  

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Awards

  • Radioisotopes誌 論文奨励賞

    1997.7   日本アイソトープ協会  

    狩野直樹, 二瓶 誠

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

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Research Projects

  • Removal of Cesium in Soil Solution by Zeolite Produced from Fly Ash

    Grant number:21K12290  2021.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

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  • 環境試料の同位体・化学分析による環境動態の把握

    1995.7 - 2018.3

    その他の研究制度 

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    Grant type:Competitive

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  • 汚泥灰からのリン回収技術の開発

    2022.6 - 2023.3

    西松建設株式会社  共同研究(国内共同研究) 

    狩野 直樹, 金 熙濬, 山崎 将義, 地井 直行

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  • ポリビニルアルコール―シリカハイブリッド材料を用いた重金属の除去

    2018.6 - 2019.3

    民間財団等  公益財団法人内田エネルギー科学振興財団 試験研究費 

    狩野 直樹

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    Authorship:Principal investigator  Grant type:Competitive

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  • 環境にやさしいリンおよび重金属の高効率回収法の構築

    2016.4 - 2019.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    狩野 直樹

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    Authorship:Principal investigator  Grant type:Competitive

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  • 燃焼凝縮水の無害化に関する研究

    2015.6 - 2016.3

    ダイニチ工業  共同研究(国内共同研究) 

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    Grant type:Competitive

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  • 重金属の除去回収のための新規吸着剤の開発

    2013.6 - 2014.3

    民間財団等  公益財団法人内田エネルギー科学振興財団試験研究費 

    狩野 直樹

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  • 重金属の除去回収を目指した新規吸着剤の開発

    2013.4 - 2016.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Grant type:Competitive

    Grant amount:\3900000 ( Direct Cost: \2730000 、 Indirect Cost:\1170000 )

    現在,地球上では資源・エネルギーの大量消費に伴う環境問題が深刻化しており,特に資源に乏しい日本においては,環境保全対策と同時に資源の確保や安定供給が重要な課題である。本研究では,これまで行ってきた「バイオマスを用いた重金属の吸着・回収」の研究を発展させ,海洋資源等の天然資源を利用して,有機―無機ハイブリッドナノ材料を作製して吸着剤の加工性を向上させることにより,重金属を効率よく除去回収できる吸着剤を開発することを目的とする。計画している具体的な研究項目として,(Ⅰ)アルギン酸(海藻由来)-炭酸カルシウム(貝殻由来)合成物質やキトサン加工物質による重金属の除去回収,さらには,(Ⅱ)生分解性キレート剤を層間挿入したハイドロタルサイトによる重金属の除去回収である。

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  • バイオマスを用いた重金属の吸着と回収の新手法

    2010.4 - 2013.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Grant type:Competitive

    Grant amount:\3800000 ( Direct Cost: \2660000 、 Indirect Cost:\1140000 )

    現在、水質汚染をはじめ様々な環境問題が国内外で大きな注目を集めている。本研究では、環境に低負荷で低コストである天然物質を用いて汚染物質を除去・回収する手法を確立して環境浄化に役立てることを目的とする。一方で、希土類元素等の重金属は幅広い産業分野で利用されており、近年需要が拡大しているものの、国内では枯渇の危機にある。そこで、資源の安定供給が課題となっている点に着目し、バイオマスを金属の吸着剤として利用し、資源回収に役立てることを目指す。具体的には、海藻・貝殻・植物・木材等のバイオマス試料を用いて、重金属特に希土類元素(REEs)、トリウム(Th)、ウラン(U)等の吸着・捕捉に関する最適条件を決定する。そして、得られたデータをLangmuirやFreundlich等の吸着等温モデル式に適応し、吸着メカニズムの検討を行う。これらの結果に基づき、生物吸着を利用した汚染物質の除去・回収ならびに希少金属の回収法を確立し、実用化に向けてのアプローチとすることを目指す。

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  • 湿地における汚染物質の動態および天然物質を用いた環境浄化へのアプローチ

    2009.4 - 2010.3

    民間財団等  高橋産業経済研究財団研究助成 

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    Grant type:Competitive

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  • 発生土の活用化研究

    2007.8 - 2009.3

    新潟工業用水組合  共同研究(国内共同研究) 

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    Grant type:Competitive

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  • 湿地帯における環境汚染物質の動態ならびに汚染物質の低減化への試み

    2006.4 - 2008.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Grant type:Competitive

    Grant amount:\3500000 ( Direct Cost: \2990000 、 Indirect Cost:\510000 )

    湿地における環境汚染物質の動態把握および汚染物質の低減化や回収除去法の探索の目的で,環境試料中のウラン(U)・トリウム(Th)等の放射性物質,溶存有機炭素(DOC),多環芳香族炭化水素類(PAHs)の定量に加え,酸素安定同位体比(δ18O)等の定期的測定を行う。さらに,各種汚染物質[トリチウム(T), U, Th等の放射性物質やクロム(Cr), ヒ素(As)等の重金属]の取り込みや吸着に関するモデル実験を行う。

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  • 湿地における環境汚染物質の動態と分析方法

    2005.4 - 2010.3

    チチハル大学  共同研究(国際共同研究) 

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    Grant type:Competitive

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  • 大気・降下物中に含まれる多環芳香族炭化水素類(PAHs)の挙動と発生源の推定に関する研究

    2005.4 - 2007.3

    新潟県保健環境科学研究所  共同研究(国内共同研究) 

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    Grant type:Competitive

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  • 降雨・降雪中に含まれるPOPs等微量物質の動態及び起源の解明に関する研究

    2003.11 - 2005.3

    新潟県保健環境科学研究所,酸性雨研究センター  共同研究(国内共同研究) 

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    Grant type:Competitive

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  • 天然物質を用いた環境浄化・修復法および資源回収法の検討

    2003.4 - 2015.3

    その他の研究制度 

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    Grant type:Competitive

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  • 水素同位体交換反応を用いた機能性物質の反応性の評価

    1996.4 - 2017.3

    その他の研究制度 

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    Grant type:Competitive

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  • 隕石・ウラン鉱石の同位体・化学組成から見た太陽系初期情報の探求

    1989.4 - 1995.7

    その他の研究制度 

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    Grant type:Competitive

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Teaching Experience (researchmap)

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Teaching Experience

  • 環境計測化学

    2022
    Institution name:新潟大学

  • 統合化学入門

    2022
    Institution name:新潟大学

  • 素材解析化学

    2022
    Institution name:新潟大学

  • 創造研究プロジェクトI

    2021
    Institution name:新潟大学

  • 創造プロジェクト基礎

    2021
    Institution name:新潟大学

  • 創造プロジェクトI

    2021
    Institution name:新潟大学

  • 創造プロジェクトII

    2021
    Institution name:新潟大学

  • 創造研究プロジェクトII

    2021
    Institution name:新潟大学

  • 表面計測化学

    2021
    Institution name:新潟大学

  • 素材反応制御化学

    2021
    Institution name:新潟大学

  • 技術文献リサーチC

    2020
    Institution name:新潟大学

  • 技術文献リサーチD

    2020
    Institution name:新潟大学

  • 技術文献リサーチB

    2020
    Institution name:新潟大学

  • 技術文献リサーチA

    2020
    Institution name:新潟大学

  • リメディアル演習

    2020
    Institution name:新潟大学

  • 計測化学I

    2018
    Institution name:新潟大学

  • 分析化学(工)

    2018
    Institution name:新潟大学

  • 分析化学実験(工)

    2018
    Institution name:新潟大学

  • 特許と技術経営II

    2017
    Institution name:新潟大学

  • 工学リテラシー入門(化学材料分野)

    2017
    Institution name:新潟大学

  • 特許・経営および製品開発入門

    2017
    Institution name:新潟大学

  • 特許と技術経営I

    2017
    Institution name:新潟大学

  • 素材反応制御化学

    2017
    -
    2021
    Institution name:新潟大学

  • 自然科学総論Ⅱ

    2017
    Institution name:新潟大学

  • 外国語論文解説・討論Ⅰ

    2015
    Institution name:新潟大学

  • 材料生産システム博士特定研究Ⅲ

    2015
    Institution name:新潟大学

  • 材料生産システム博士特定研究Ⅱ

    2014
    -
    2015
    Institution name:新潟大学

  • 材料生産システム博士セミナーⅠ

    2014
    -
    2015
    Institution name:新潟大学

  • 中間発表

    2014
    -
    2015
    Institution name:新潟大学

  • 材料生産システム博士特定研究Ⅰ

    2014
    -
    2015
    Institution name:新潟大学

  • 素材生産科学コース演習

    2014
    -
    2015
    Institution name:新潟大学

  • 材料生産システム博士セミナーⅡ

    2014
    Institution name:新潟大学

  • 素材生産科学文献詳読Ⅱ

    2012
    -
    2015
    Institution name:新潟大学

  • 素材生産科学セミナーⅠ

    2012
    -
    2015
    Institution name:新潟大学

  • 材料生産システム特定研究Ⅱ

    2012
    -
    2015
    Institution name:新潟大学

  • 素材生産科学セミナーⅡ

    2012
    -
    2015
    Institution name:新潟大学

  • 素材生産科学文献詳読Ⅰ

    2012
    -
    2015
    Institution name:新潟大学

  • 素材生産科学特別演習

    2012
    -
    2015
    Institution name:新潟大学

  • 材料生産システム特定研究Ⅰ

    2012
    -
    2015
    Institution name:新潟大学

  • 研究発表演習・発表

    2012
    -
    2014
    Institution name:新潟大学

  • 卒業研修

    2009
    Institution name:新潟大学

  • 工学リテラシー入門(化学システム工学科)

    2009
    -
    2016
    Institution name:新潟大学

  • 化学技術英語

    2008
    Institution name:新潟大学

  • 化学システム工学入門

    2008
    Institution name:新潟大学

  • 計測化学II

    2007
    Institution name:新潟大学

  • 最先端技術を支える化学 I

    2007
    Institution name:新潟大学

  • 卒業研究

    2007
    Institution name:新潟大学

  • 応用化学演習II

    2007
    Institution name:新潟大学

  • 素材解析化学

    2007
    -
    2020
    Institution name:新潟大学

  • 環境計測化学

    2007
    -
    2020
    Institution name:新潟大学

  • 論文輪講I

    2007
    -
    2019
    Institution name:新潟大学

  • 論文輪講II

    2007
    -
    2018
    Institution name:新潟大学

  • 分析化学実験

    2007
    -
    2017
    Institution name:新潟大学

  • 卒業基礎研究

    2007
    -
    2008
    Institution name:新潟大学

  • 応用化学実習

    2007
    Institution name:新潟大学

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