Evidence has been found for the catalysis of the decomposition of Caro's acid (peroxymonosulfuric acid) by specific substances in aqueous phosphate buffer. Cobalt (II) and molybdenum (VI) are especially effective, although some other metal ions also act as catalysts for the decomposition. The observed catalytic decompositions are first order in the concentration of Caro's acid with the exception of the cobalt-catalyzed decomposition which is second order in Caro's acid. The order in catalyst concentration could not be determined except in the case of molybdate wherein an order of one-half and an induction period were found.
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