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Formation of Actinide(III)-Humate and its Influence on Adsorption on Kaolinite

Published online by Cambridge University Press:  15 February 2011

Yoshio Takahashi ,
Yoshitaka Minai ,
Takaumi Kimura ,
Yoshihiro Meguro  and
Takeshi Tominaga
Yoshio Takahashi
Affiliation:
Department of Chemistry, School of Science, University of Tokyo, Hongo, Tokyo 113, Japan. Research Fellow of the Japan Society for the Promotion of Science.
Yoshitaka Minai
Affiliation:
Department of Chemistry, School of Science, University of Tokyo, Hongo, Tokyo 113, Japan.
Takaumi Kimura
Affiliation:
Tokai Research Establishment, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319–11, Japan.
Yoshihiro Meguro
Affiliation:
Tokai Research Establishment, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319–11, Japan.
Takeshi Tominaga
Affiliation:
Department of Chemistry, School of Science, University of Tokyo, Hongo, Tokyo 113, Japan.
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Abstract

Apparent stability constants of Eu(III)- and Am(III)-humates determined at various pH (4.8 to 8) and supporting electrolyte concentration (0.02 to 1 mol/1), indicate that the humate complexes may be dominant species in the aquifer. Distribution coefficients of Eu(III) and Am(III) between kaolinite and solution phase were affected strongly by the presence of humic acid in the solution. Adsorption of humic acid may be an important factor controlling fixation of actinides(III) on mineral surfaces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 189
Copyright
Copyright © Materials Research Society 1995

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References

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