Effect of inorganic ligands and hydrogen peroxide on Th[O.sub.2] dissolution. Behavior of [Th.sub.0.87][Pu.sub.0.13][O.sub.3] during leaching test

The dissolution of Th[.sub.2] powdered samples in various conditions of pH and concentrations of anions in the leachate and the effect of pH on the dissolution of Th[O.sub.2] in both nitric and hydrochloric media are examined. The redox properties of plutonium in acidic media, like disproportionation of Pu(IV) and Pu(V) and reduction of Pu(VI) and Pu(IV) in Pu(III) by [H.sub.2][O.sub.2], has increased the dissolution of plutonium.