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M.J. Comarmond, P.L. Brown

The hydrolysis of uranium(VI) in sulfate media

The hydrolysis of uranium(VI) has been investigated in 0.10 and 1.0 mol dm^-3Na₂SO₄ using the potentiometric titration technique. Analysis of the data indicates the presence of the following uranyl hydrolysis species: (UO₂)₂(OH)₂²⁺, (UO₂)₃(OH)₄²⁺, (UO₂)₄(OH)₇⁺ and (UO₂)₅(OH)₈²⁺ 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).

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 88, 09/2000
Pages: 573

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