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The hydrolysis constants of tetravalent uranium were determined by a solvent extraction method using thenoyltrifluoroacetone(TTA) and  233 U. The distribution ratio of U(IV) was measured as a function of the pH c  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 UOH 3+ , U(OH) 2  2+  and U(OH) 3  + . The solubility product ( K  sp ) for the reaction of UO 2 · x H 2 O=U 4+ +4OH -  + (x-2)H 2 O was also calculated to be log  K  sp ° =-53.93±0.20 by considering the hydrolysis constants.

Determination of uranium(IV) hydrolysis constants and solubility product of UO 2 · x H 2 O