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2000•Radiochimica ActaRequires access

The hydrolysis of uranium(VI) in sulfate media

M. Josick Comarmond, Paul L. Brown

Open publisher page 11 citations

Abstract

The hydrolysis of uranium(VI) has been investigated in 0.10 and 1.0 mol dm -3 Na2SO4 using the potentiometric titration technique. Analysis of the data indicates the presence of the following uranyl hydrolysis species: (UO2)2(OH)2 2+, (UO2)3(OH)4 2+, (UO2)4(OH)7 + and (UO2)5(OH)8 2+ in both media, and additionally, UO2OH+ and (UO2)3(OH)5 + in the lower ionic strength only. The data were used to calculate stability constants for ternary uranyl hydroxo-sulfate complexes. These constants were found to be in excellent agreement with those found in an earlier study at a higher Na2SO4 concentration (1.5 mol dm-3).

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What this paper is about

The hydrolysis of uranium(VI) has been investigated in 0.10 and 1.0 mol dm -3 Na2SO4 using the potentiometric titration technique. Analysis of the data indicates the presence of the following uranyl hydrolysis species: (UO2)2(OH)2 2+, (UO2)3(OH)4 2+, (UO2)4(OH)7 + and (UO2)5(OH)8 2+ in both media, and additionally, UO2OH+ and (UO2)3(OH)5 + in the lower ionic strength only. The data were used to calculate stability constants for ternary uranyl hydroxo-sulfate complexes. These constants were found to be in excellent agreement with those found in an earlier study at a higher Na2SO4 concentration (1.5 mol dm-3).

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Available abstract

The hydrolysis of uranium(VI) has been investigated in 0.10 and 1.0 mol dm -3 Na2SO4 using the potentiometric titration technique. Analysis of the data indicates the presence of the following uranyl hydrolysis species: (UO2)2(OH)2 2+, (UO2)3(OH)4 2+, (UO2)4(OH)7 + and (UO2)5(OH)8 2+ in both media, and additionally, UO2OH+ and (UO2)3(OH)5 + in the lower ionic strength only. The data were used to calculate stability constants for ternary uranyl hydroxo-sulfate complexes. These constants were found to be in excellent agreement with those found in an earlier study at a higher Na2SO4 concentration (1.5 mol dm-3).

Key concepts: Chemistry, Uranyl, Uranium, Hydrolysis, Potentiometric titration, Ionic strength, Ternary operation, Sulfate

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