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Reduction of Pu(VI) to Pu(III) with acetaldoxime (CH 3 CHNOH) in an HNO 3 solution involves three consecutive steps Pu(VI) 6 Pu(V) 6 Pu(IV) 6 Pu(III), and also reproportionation of Pu(IV). Complete kinetics equations of these steps were derived and the rate constants and activation energies of these steps were determined by computer treatment of the experimental kinetic data for all Pu valence forms. The mechanisms of these reaction steps based on the experimental results were discussed.

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