Elucidation of redox reaction mechanisms and control of oxidation states of actinide ions in a neutral solution or dispersed solution

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The flow cell with a platinized glassy carbon working electrode was developed for control the oxidation states of actinide ions. The overpotentials of the reduction of Np(V) and Pu(V) were decreased , and a precise method for the preparation of the actinide ions of desired oxidation state was proposed. Redox reactions of actinide ions in neutral solutions were investigated. U(V) was reduced to UO_2 by both of electrode reaction and disproportionation. The reduction of U(V) and the aggregation of UO_2 became faster when UO_2 was formed in the solution or at the electrode surface.