Uranyl hydroxide / Uranyl carbonate j Solubility products / Complexation SummaryThe solubility of uranyl hydroxide and uranyl carbonate and the formation constants of the complexes present in the supematant Solution were determined at 25°C in 0.1 M NaClOi solutions. The solubility products were found to be logA^,p= -22.21 and log/Csp= -13.29. respectively. In the pH ränge from 4.5 to 5.5 the hydroxo complexes (U02)2(0H)r (lg/? = 22.16), and (U02)3(0H)5^ (lg^ = 53.05) were found. Under the condition -11

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The solubility products of uranyl hydroxide and uranyl carbonate and the formation constants of the complexes present in the solution have been determined at 25°C and I=0.1 mol dm" 3 by potentiometry and solubility experiments. The uranyl complexes U0 2 (OH) 2 , (UO2) 2 (OH)2+, (UO2) 3 (OH) 5 +, U0 2 C0 3 , U0 2 (CO 3 ) 2 2 " and U0 2 (CO 3 ) 3 4-were identified. For the system uranyl-hydroxide the results were verified by analysis of conductance measurements. A similar investigation was carried out for thorium. Using Pu(IV)-chloride complexes as an example the potential of differential pulse voltarnmetry is demonstrated for the determination of small formation constants.