Abstract
Potentiometric titrations of uranyl(VI) solutions were conducted using a standard glasslcalomel electrode combination over the pH range 3 to 12 at 0.1 molkg−1 ionic strength with tetramethylammonium trifluoromethanesulfonate as the supporting electrolyte. The electrodes were calibrated directly on the hydrogen ion concentration scale during the initial stage of each titration. The species, UO 2+2 , (UO2)2(OH) 2+2 , (UO2)3(OH) +5 , (UO2)3(OH) −7 , (UO2)3(OH) 2−8 , and (UO2)3(OH) 4−10 identified in an earlier Raman study were compatible with the analysis of the titration data. Based on this analysis and application of the extended Debye-Hückel treatment, the polynuclear species indicated above were assigned overall formation constants at 25°C and at infinite dilution of −5.51±0.04, −15.3±0.1, −27.77±0.09, −37.65±0.14, and −62.4±0.3, respectively. The results are discussed in reference to hydrolysis quotients reported in the literature for the first three species. Formation quotients for the last two species have not been reported previously.
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Palmer, D.A., Nguyen-Trung, C. Aqueous uranyl complexes. 3. Potentiometric measurements of the hydrolysis of uranyl(VI) ion at 25°C. J Solution Chem 24, 1281–1291 (1995). https://doi.org/10.1007/BF00972833
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DOI: https://doi.org/10.1007/BF00972833