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Humate Complexation of Neptunium(V) and its Modeling

Published online by Cambridge University Press:  15 February 2011

Hirotake Moriyama ,
Yasuhiro Nakata  and
Kunio Higashi
Hirotake Moriyama
Affiliation:
Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka 590–04, Japan
Yasuhiro Nakata
Affiliation:
Department of Nuclear Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606–01, Japan.
Kunio Higashi
Affiliation:
Department of Nuclear Engineering, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606–01, Japan.
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Abstract

The complexation behavior of Np(V) with humate was investigated by spectrophotometry in the pH range from 5.7 to 10 in 0.01–0.5M NaClO4. The absorption peaks of NpO2+ and Np(V) humate were observed at 979.6nm and 989.9nm, respectively, and the apparent complexation constant of the Np(V) humate was found to be pH-dependent. A two-site complexation model was applied to the interpretation of the observed pH-dependence by considering the participation of the two functional groups of carboxylate and phenolate. The dissociation and complexation constants of both functional groups were determined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 1129
Copyright
Copyright © Materials Research Society 1995

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References

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