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Vol. 69 nese between colloid and solution, Tests B-l and B-2 were made. These were identical in all respects with A-l and A-2, except that radioactive manganese was used throughout. The results are reported in Table II.Radioactivity Center for aid in planning the radioactivity studies. SummaryA study has been made of the catalytic decomposition of hydrogen peroxide with oxides of manganese, formed in situ from permanganate or manganous salts and alkali. The use of radioactive tracers indicates that catalysis takes place by alternate reduction and oxidation of manganese. Determination of the conditions under which catalysis occurs shows that the oxidation step of the cycle does not take place unless the solution is saturated with manganous hydroxide. A probable mechanism is Mn02

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