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The radiation yields of carbon dioxide, molecular hydrogen, and hydrogen peroxide formed were measured at 50 niM oxalic acid and 0.75 mM oxygen concentrations, over the pH range from 1.61 to 9.85. The results obtained are quantitatively consistent with a simple schenie which allows the determination of the primary free radical and niolecular yields in the pH region studied. A cube root dependence of the measured molecular hydrogen yields on oxalic acid concentration has been observed. . 0. Allen for his helpful suggestions and discussion of this work. Thanks are also due to 1VIrs. M. JIarovid and RIr. V. Jovanovid for their technical assistance in the experiments. (21) C. H. Cheek and V.

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The radiation yields of carbon dioxide, molecular hydrogen, and hydrogen peroxide were measured over the pH range from 9.5 to 14 in aqueous solutions of various oxalate and oxygen concentrations. The results obtained confirmed the change in the nature of hydroxyl radical with increasing pH. The basic form is replaced by ion radical 0-whose fate is determined in reactions with oxygen molecules and oxalate ions. The rate constant ratio ko-+o,/ko-+C20,2-was calculated from the experimental data. A cube root dependence of the molecular hydrogen yields, measured as a function of the oxalic acid concentration, was observed. The experimental results were quantitatively consistent with a simple reaction scheme which allowed determination of the primary yields in water y radiolysis in the pH region 9.5-14.

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