SOME SPECIFIC FEATURES OF THE ELECTROCHEMICAL-BEHAVIOR OF ARSENITE IONS AT A ROTATING PLATINUM-ELECTRODE STUDIED BY CYCLIC VOLTAMMETRY

The electrochemical behavior of arsenite ions was studied by cyclic vo ltammetry at a rotating disk platinum electrode in a sulfuric acid sol ution. The current peak (E-p = 0.90 V) observed in the potential range from +0.70 to +1.45 V increases linearly with an increase in the conc entration of arsenite ions from 2 x 10(-7) to 5 x 10(-6) and from 5 x 10(-6) to n x 10(-4) M. It is assumed that the oxidation of arsenite i ons involves reduced oxygen species adsorbed on the surface of the pla tinum electrode. It is shown that this effect can be used for the rapi d determination of As(III).