Voltammetric Behavior of Several Anions in Acetonitrile at Platinum Electrodes Coated with Polyacrylamide Coupled to Cobalt Phthalocyanine

Abstract

The voltammetric behavior of several anions in acetonitrile (AN) was studied at electrodes consisting of polyacrylamide (PAA) coupled to cobalt phthalocyanine (PhCo) and a platinum disk. Well-defined anodic peaks were obtained by cyclic voltammetry for chloride, bromide, iodide, thiocyanate, and tetraphenylborate ions, while fluoride and cyanide ions gave broad peaks. The anodic peak current versus concentration plots were linear for these anions over a concentration range of 1 to about 10mM. Fluoride and cyanide ions were accumulated in the PAA-PhCo membrane, and the anodic peak current increased with the standing time to give well-defined sharp peaks. The anodic peak processes of chloride, bromide and tetraphenylborate ions were diffusion controlled.