Determination of uranium(IV) hydrolysis constants and solubility product of UO2·xH2O
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Kenso Fujiwara
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 (βm) 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 β1°=13.71±0.31, β2°=26.12±0.21 and β3°=36.85±0.36, together with the ion interaction coefficients of UOH3+, U(OH)22+ and U(OH)3+. The solubility product (Ksp) for the reaction of UO2·xH2O=U4++4OH- + (x-2)H2O was also calculated to be log Ksp° =-53.93±0.20 by considering the hydrolysis constants.
© 2003 Oldenbourg Wissenschaftsverlag GmbH
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Artikel in diesem Heft
- The influence of ozone on ligand-assisted extraction of 239Pu and 241Am from Rocky Flats soil
- Biosorption of americium-241 by Candida sp.
- Uranium speciation in plants
- A fluorescence spectroscopic study on the speciation of Cm(III) and Eu(III) in the presence of organic chelates in highly basic solutions
- Synthesis and characterization of neptunyl(VI) and plutonyl(VI) orthosilicates
- Determination of uranium(IV) hydrolysis constants and solubility product of UO2·xH2O
- A comparision of the extraction of carrier-free 176,177W and 99Mo with that of U, Th, Am, Cm, La, Ce, Tm, Yb, Lu and Hf into Aliquat 336 in toluene from nitric, phosphoric, and sulphuric acid media
- Field study of the migration of 90Sr in a weak loess aquifer
- Standardisation of the prompt gamma activation analysis method
