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SORPTION BEHAVIOR OF ACTINOIDS ON WEATHERED MINERALS

Research Project

Project/Area Number 07680521
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

YAMAZAKI Hiromichi  Tohoku University, Faculty of Engineering, Associate Professor, 工学部助教授 (00166654)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1996: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1995: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsMetal-Ion Sorption / Neptunium / Hydrous Metal Oxide / Gibbsite / Goethite / Hematite / Corundum / Magnetite / Np (V) / ヘマタイト / ネプツニウム(V) / 鉄酸化物鉱物 / 含水酸化鉄 / アルミニウム酸化物鉱物 / 含水酸化アルミニウム / 収着機構 / 分布係数 / イオン交換
Research Abstract

Understanding the sorption behavior of nuclides having long-term radiological toxicity onto geological materials is central to the safety assessment of underground disposal of radioactive waste. In order to see the effect of crystal structure, crystallinity and surface conditions of various oxides and hydrous oxides on the sorption of metal ions, the sorption of tracer concentrations of Np(V) on naturally occurring iron and alumiun minerals, synthetic oxide powders and laboratory-prepared hydrous oxides was studied as a function of pH.The orders of their abilities to sorb Np(V) were hydrous oxides including oxyhydroxides and hydroxides > synthetic oxide powders > minerals (hematite, magnetite and corundum). These results suggest that the sorption of tracer concentrations of actinoids is controlled primarily by their crystal structures and subsidiarily by their surface areas, indicating that the transformation of oxides and hydrous oxides of iron and aluminum occurring in natural enviro … More nments will give a serious influence on the migration of radionuclides. The effects of metal ion saturation on the sorption of Eu(III) and Co(II) on goethite, gibbsite and laboratory-prepared amorphous iron and aluminum oxides were studied as a function of pH over a wide range of metal ion concentrations. When the metal ion concentrations were low, a simple Langmuir equation, assuming a single binding constant, was capable of describing sorption on these hydrous oxides. At high metal ion concentrations, sorption on goethite and gibbsite exhibited clear saturation maxima, indicating that sorption on these minerals was controlled by a simple one-to-one interaction between the metal ion and a binding site. Conversely, sorption on laboratory-prepared hydrous oxides continued to increase even at high metal ion concentrations, indicating that sorption on amorphous hydrous oxides proceeds through a somewhat different pathway, such as the formation of a pricipitate or a solid solution at the binding surface. Less

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] O.Tochiyama: "Effect of the concentration of Metal Ians on their Adsorption on Various Hydrous Iron and Alumlnum Oxides" Journal of Nuclear Science and Technology. 33・No.11. 846-851 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] O.Tochiyama: "Sorption of Neptanium(v)001 Various Aluminm Oxides and Hydrous Aluminum Oxides" Radiochimica Acta. 73. 191-198 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] O.Tochiyama, H.Yamazaki and N.Li: "Effect of the Concentration of Metal Ions on their Adsorption on Various Hydrous Iron and Aluminum Oxides" Journal of Nuclear Science and Technology. Vol.33(No.11). 846-851 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] O.Tochiyama, H.Yamazaki and T.Mikami: "Sorption of Neptunium(V) on Various Aluminum Oxides and Hydrous Aluminum Oxides" Radiochimica Acta. Vol.73. 191-198 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] O. Tochiyama: "Effect of the Concentration of Metal Ions ontheir Adsorption on Various Hydrous Iron and Aluminum Oxides" Journal of Nuclear Science and Technology. 33・No.11. 846-851 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] O. Tochiyama: "Sorption of Neptunium (V) on Various Aluminum Oxides and Hydrous Aluminum Oxides" Radiochimica Acta. 73. 191-198 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] O. Tochiyama: "Sorption of Neptunium (V) on Various Aluminum Oxides and Hydrous Aluminum Oxides" Radiochimica Acta. (発表予定).

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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