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The kinetics of the oxidation of plutonium(IV) by manganese dioxide were studied in 1.0 M NaCl over the pH range from 2.5 to 8.2 with variable concentrations of manganese dioxide from 0.01 m 2 /L to 4.97 m 2 /L at a constant temperature of 19 ± 2 °C. The concentration of plutonium in solution was 6.0(± 1.0) × 10 −10  M. Fractions of Pu(IV), (V) and (VI) as a function of time were determined by removal of plutonium from the solid phase followed by an ultrafiltration/solvent extraction procedure using TTA and HDEHP as extractants. Appropriate removal conditions were established for Pu(IV), Pu(V) and Pu(VI) using Th(IV), Np(V) and U(VI) as oxidation state analogs.

Kinetics of the oxidation of Pu(IV) by manganese dioxide