Abstract
Uranyl-pamoate complex in dimethyl sulfoxide solution gives two reduction waves at pH 4·0–5·0 and pH 5·8–8·5, respectively. The first wave is the reduction of UO 2 (Dm) 5 Pm species when [DMSO] ≤ 60 vol.%, however it was proved to be the simultaneous reduction of the two species UO 2 (Dm) 6 +2 and UO 2 (Dm) 5 Pm when [DMSO] > 70 vol.%. The second wave is quasi-reversible, corresponding to the reduction of UO 2 (OH)(Dm) 4 Pm − species. The electron transfer coefficients, rate constants of electro-reduction and electro-oxidation, and polarographic overpotentials were determined. The hydrolysis constants of uranyl ion in dimethyl sulfoxide concentrations 50–70 vol.% at pH 4·0–4·8 were determined.
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