The kinetics of oxidation of l-ascorbic acid (H2A) by Cr v~ with and without added Cu n conforms to the stoichiometry represented by the equation:2Cr w + 3H2A ~ 2Cr m + 3A + 6H + where A is dehydroascorbic acid. The mode of the electron transfer from HzA to Cr vI is suggested to involve oxidative decomposition of an intermediate complex. Catalysis by Cu n is indicated via complexation of the catalyst and substrate. The inhibitory effects of CI-, NO 3 and SO4 2 -ions indirectly support complexation between Cr w and H2A.
The kinetics of oxidation of malonic acid by both [MnO4]-and MnO 2 have been studied in an HC104 medium. The oxidation product of the organic acid was found to be glyoxylic acid. A reaction mechanism assuming complexation between MnO2 and malonic acid is suggested. The rate is independent of [H+].
The kinetics of oxidation of Aspartic acid by bismuth(V) studied in HC101-HF mixture iodometrically exhibit complex dependence with respect to aspartic acid (AA). The rate
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