Determination of uranium(IV) hydrolysis constants and solubility product of UO2·xH2O

Author:

Fujiwara Kenso,Yamana Hajimu,Fujii Toshiyuki,Moriyama Hirotake

Abstract

Summary The hydrolysis constants of tetravalent uranium were determined by a solvent extraction method using thenoyltrifluoroacetone(TTA) and 233U. The distribution ratio of U(IV) was measured as a function of the pHc value in the aqueous phase at I=0.1, 0.5 and 1.0, and was analyzed to obtain the hydrolysis constants (β m) of U(OH)m (4- m )+ at the standard state (I=0). By taking the specific ion interaction theory (SIT) for ionic strength corrections, the hydrolysis constants at I=0 were determined to be β 1°=13.71±0.31, β 2°=26.12±0.21 and β 3°=36.85±0.36, together with the ion interaction coefficients of UOH3+, U(OH)2 2+ and U(OH)3 +. The solubility product (K sp) for the reaction of UO2·xH2O=U4++4OH- + (x-2)H2O was also calculated to be log K sp° =-53.93±0.20 by considering the hydrolysis constants.

Publisher

Walter de Gruyter GmbH

Subject

Physical and Theoretical Chemistry

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