NEW PROCEDURE FOR LINEAR SWEEP VOLTAMMETRIC DETERMINATION OF CATALYTIC REACTION-RATE CONSTANT - OXIDATION OF SOME ALIPHATIC-ALCOHOLS WITH ELECTROLYTICALLY GENERATED OS(VIII)

Oxidation rate of methanol, ethanol and 2-propanol by Os(VIII) in 1 M KOH was determined by evaluating anodic voltammograms of Os(VI) in the presence of the aliphatic alcohols. The proposed method is based on t he evaluation of the change of voltammogram shape by catalytic process and on the assumption of its approximation by fractionally integrated voltammograms. This assumption has been confirmed empirically for k'( f)/a in the interval of <0.04,1>. The rate constants from this interva l could be determined with sufficient accuracy. The method is suitable for evaluation of reaction rates slow and moderately fast catalytic r eactions. It was compared with other evaluation methods from the liter ature.