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Radiolysis of aqueous solutions of arsenite ions (10" 3 -10" 1 M) at pH 10 is studied in the presence of Ο, 10" 3 -1 Μ bromate. The G(-As(III)) is 2.4 for all the As(III) concentrations in the pure arsenite solution (pH 10) while in the mixture it increases with both the As(III) and BrO, concentrations. In all the cases there is a decrease in pH at the end of the irradiation. The very high G(-As(III)) (= 90-180) abruptly decreases to about 14 in each case at and below pH 7, when a relation 3.3 G(Br~) = G(-As(III)) holds. The trend remains the same whether the solution is deaerated or not. A suitable mechanism is proposed to explain the results.

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