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Studies on Hydrolysis and Complexation Reactions of Transuranium Elements

Research Project

Project/Area Number 06453201
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field エネルギー学一般・原子力学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

MORIYAMA Hirotake  Research Reactor Institute, Kyoto Univ.Professor, 原子炉実験所, 教授 (90127150)

Co-Investigator(Kenkyū-buntansha) HIGASHI Kunio  Faculty of Engineering, Kyoto Univ.Professor, 工学部, 教授 (30026017)
TANAKA Yoshiko  Research Reactor Inst., Kyoto Univ.Instructor, 原子炉実験所, 助手 (70027449)
NISHIKAWA Sataro  Research Reactor Inst., Kyoto Univ.Instructor, 原子炉実験所, 助手 (60027430)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1995: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1994: ¥4,900,000 (Direct Cost: ¥4,900,000)
KeywordsNeptunium / Transuranium / Hydrolysis / Complexation / Solubility / Carbonate Complex / Humic Acid / Radioactive Waste Disposal
Research Abstract

Migration behavior of transuranium elements such as neptunium is very important for the performance assessment of geologic disposal of high level radioactive wastes. Generally speaking, however, the elements show complex chemical behavior, and the behavior is not completely understood yet. Because of their chemical nature, transuranium elements are very sensitive to redox conditions, and are likely involved in hydrolysis and complexation reactions in aqueous solutions.
In the present study, the hydrolysis and complexation reactions of transuranium elements were studied in order to know the chemical behavior of transuranium elements in aqueous solutions under the conditions of geologic disposal. Obtained results are as follows :
(1) The effect of carbonate ions on the solubility of Np (VI) was measured, and a new result was obtained for the formation of hydrolysis and hydroxycarbonate complex species of Np (VI).
(2) A simple hard sphere model was presented to study the systematics for the termodynamic constants of hydrolysis and carbonate complexation of transuranium ions. The model was found to be useful to check the experimental values and to predict the unknown ones.
(3) With the use of commercial humic acids, humate complexation of Np (V) was measured. The results were found to be successfully interpreted by a multi-site model.
(4) Adsorption behavior of Np (V) and Cs onto quartz was measured and analyzed by an electric double layr model. The analysis was successful, and the pH and ionic strength dependences of distribution coefficients were well interpreted by considering a number of adsorption reactions on the quartz surface.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] H. Moriyama et al.: "Systematics of Hydrolysis and Carbonate Complexation Constants of Ions of Transuranium Elements" Radiochim. Acta. 66/67. 73-79 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H. Moriyama et al.: "Hydrolysis and Carbonate Complexation of Np(VI) in High pH Solutions" Radiochim. Acta. 69. 49-54 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H. Moriyama et al.: "Humate Complexation of Np(V) and Its Modeling" Mat. Res. Soc. Symp. Proc.353. 1129-1136 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Moriyama et al.: "Systematics of Hydrolysis and Carbonate Complexation Constants of Ions of Transuranium Elements" Radiochim. Acta. 66/67. 73-79 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Moriyama et al.: "Hydrolysis and Carbonate Complexation of Np (VI) in High pH Solutions" Radiochim.Acta. 69. 49-54 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Moriyama et al.: "Humate Complexation of Np (V) and Its Modeling" Mat.Res.Soc.Symp.Proc.353. 1129-1136 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Moriyama et, al.: "Systematics of Hydrolysis and Carbonate Complexation Constants of Ions of Transuranium Elements" Radiochim. Acta. 66/67. 73-79 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] H. Moriyama et al.: "Hydrolsis and carbonate Complexation of Np(VI) in High pH Solutions" Radiochim. Acta. 69. 49-54 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H. Moriyama et al.: "Humate Complexation of Neptunium(V) and Ite Modeling" Mat. Res. Soc. Symp. Proc.353. 1129-1136 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] H.Moriyama et al.: "Hydrolysis and Carbonate Complexation of Np(VI)in Higy pH Solutions" Radiochimica Acta.

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Moriyama et al.: "Systematics of Hydrolysis and Carbonate Complexation Constants of Ions of Transuranium Elements" Radiochimica Acta. 66/67. 73-79 (:1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Moriyama et al.: "Humate Complexation of Np(V)and Its Modeling" Mater.Res.Soc.Symp.Proc.

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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