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.
Subject
Physical and Theoretical Chemistry
Cited by
37 articles.
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