Abstract
The kinetics of electrochemical oxidation of Np(IV) and Np(V) ions on a smooth platinum electrode in a 1 M HNO3 solution containing potassium phosphotungstate K10P2W17O61 (KPW) was studied by spectrophotometry. For the redox reactions under consideration, the rate laws were determined, the rate constants were calculated, and the schemes of transformations of Np ions were suggested. The electrochemical oxidation of Np(IV) and Np(V) is described by the first-order rate law with respect to the Np(IV) and Np(V) concentrations, respectively. The rate constants of these reactions are close and comparable with the rate constant of the Np(V) disproportionation.
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