Abstract
Modification of a platinum electrode by chemisorption of iodine was found to improve the reproducibility and to decrease the peak width in the oxidation of nitrite by linear scan voltammetry. A dip-coated film of quaternized poly(4-vinylpyridine), qPVP, increased the long term stability of the Pt/I electrode without inhibiting the nitrite oxidation. In a pH 4.6 phosphate buffer, the anodic peak current was directly proportional to nitrite concentration from 8×10 −6 M to 4×10 −3 M . A similar working range was observed by controlled potential electrolysis. The problems that are encountered on bare Pt and carbon electrodes were also eliminated by coating the substrates with qPVP and incorporating the IrCl 6 2−,3− couple therein. The oxidation of nitrite was demonstrated to be mediated by the IrCl 6 2− .
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