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The catalytic decomposition of hydrogen peroxide by Cu-histidine complexes has been investigated in the pH range 6-8 in phosphate buffer (0.013 M) by a differential manometric technique. The kinetic data on the initial rates of 02 evolution are explained by a second-order rate equation, first order with respect to the 1:1 Cuhistidine chelate, and first order with respect to the " anion. Chemical and spectrophotometric studies indicated that the reaction mechanism involves a cupric-cuprous couple.

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