Study on hydrolysis and complexation reactions of transuranium elements

Moriyama, Hirotake*

In support of the safety assessment of geologic disposal of high level radioactive wastes, hydrolysis and complexation reactions of transuranium elements were studied. For comparison with the case of Pu(IV), the solubility of UO $_{2}$ .xH $_{2}$ O was measured under a reducing condition, and the solubility product K $^{0}_{sp}$ and some hydrolysis constants were obtained. Similarly to the value of Pu(IV), the obtained K $^{0}_{sp}$ value was found to be considerably smaller than that predicted by Rai et al. from its dependence on ionic radius. Also, the solubility of UO $_{2}$ (OH) $_{2}$ under an oxidizing condition was measured, and the solubility product K $^{0}_{sp}$ was obtained. For complexation, furthermore, it was examined by using an improved hard sphere model to predict some complexation constants of actinide ions which were lacked in literatures.

Language	:	Japanese
Report No.	:	JNC TJ8400 2001-048
Pages	:	40 Pages
Publication Year/Month	:	2002/02
Patent information	:
PDF	:	JNC-TJ8400-2001-048.pdf:0.16MB
Paper URL	:
Keywords	:	no keyword
Research Facility	:
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:	京都大学
Other institute's report number	:

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Registration No. : GJ0820010025
JAEA Abstracts No. :

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