Abstract
Abstract The hydrolysis equilibria of the UO22+ ion in heavy water containing 3m NaClO4 as an ionic medium were studied at 25°C by potentiometric titrations, employing a technique of constant-current coulometry. The deuterium-ion concentration was measured by means of a glass electrode. The most probable hydrolysis scheme chosen in the range of the total uranyl concentration from 1 to 10mm was: (UO2)2(OD)22+−(UO2)3(OD)42+−(UO2)3(OD)5+; the respective stability constants were −log β2,2=6.80±0.02, −log β4,3=14.00±0.07, and −log β5,3=18.63±0.02. The above results reveal that the composition of the hydrolysis species in heavy water are generally the same as those in light water, while the values of the stability constants are smaller in heavy water than in light water.
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