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Studies were made of the rate of change of the mean oxidation number of plutonium solutions in perchloric, hydrochloric, and in mixed perchloric- hydrochloric acid solvents. Hydrogen peroxide concentrations were determined in the plutonium solutions. The hydrogen peroxide concentrations in perchloric acid solutions of plutonium are markedly dependent upon the temperature. The higher hydrogen peroxide concentrations are found at the lower temperatures. The rate of alpha particle reduction of plutonium solutions in molar perchloric acid was found to be only slightly infuenofced by temperature changes. From chemical analyses and gas analyses it was concluded that the perchlorate ion is reduced to the chloride ion by the alpha particle radiation. In hydrochloric acid solutions, the hydrogen peroxide concentrations and the rates of decrease of the mean oxidation number are much lower than in perchloric acid solutions of similar concentration. This inhibition of the reduction process presumably occurs through lowered yields of hydroxyl radicals and the interaction of chlorine and hypochlorous ion with hydrogen peroxide. In perchloric acid solutions of plutonium containing bromide ion, an increase in the mean oxidation number, an alpha particle oxidation process, is found. (auth)

ALPHA-PARTICLE OXIDATION AND REDUCTION IN AQUEOUS PLUTONIUM SOLUTIONS