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JAEA Reports

Study on solubility of transuranium elements, II

Moriyama, Hirotake*

JNC TJ8400 2000-050, 47 Pages, 2000/03

JNC-TJ8400-2000-050.pdf:1.49MB

In support of the safety assessment of geologic disposal of high levcl radioactive wastes, the solubility of transuranium elements was studied. The solubility of PuO $_{2}$ xH $_{2}$ O was measured undcr a reducing condition, and the solubility product K $^{0}_{sp}$ and the stability constant $_{4}$ of Pu(OH) $_{4}$ were obtained. The obtained K $^{0}_{sp}$ value was found to be much smaller than that predicted by Rai et al. from its dependence on ionic radius. Also, the solubility of PuO $_{3}$ 3 xH $_{2}$ O was measured under an oxidizing condition and the solubility product K $^{0}_{sp}$ was obtained. In the analysis of hydrolysis constants of actinide ions, it was found that the systematic trend of the hydrolysis constants was well explained by the hard sphere model considering the effective charges of actinide ions.

JAEA Reports

Thermodynamic Date for Predicting Concentrations of AnO $_{2}$ $^{+}$ and AnO $_{2}$ $^{2+}$ Species in Geologic Environments

Choppin, G. R.*; Bronikowski, M.*; Chen, J.*; Byegard, J.*; Rai, D.*; Yui, Mikazu

JNC TN8400 99-012, 155 Pages, 1999/01

JNC-TN8400-99-012.pdf:5.53MB

This report provides thermodynamic data for predicting concentrations of pentavalent and hexavalent actinide species (AnO $_{2}^{+}$ and AnO $_{2}^{2+}$ ) in geologic environments, and contributes to an integration of the JNC chemical thermodynamic database, JNC-TDB (previously PNC-TDB), for the performance analysis of geological isolation system for high-level radioactive wastes. Thermodynamic data for the formation of complexes or compounds with hydroxide, chloride, fluoride, carbonate, nitrate, sulfate and phosphate are discussed in this report. The estimation of the stability constants by use of the Born equation is included. The Pitzer parameters for AnO $_{2}^{+}$ and AnO $_{2}$ $^{2+}$ , redox potentials and equilibrium constants of redox reactions for actinides are also included.