Voltammetric Investigation of Reaction of l-Ascorbic Acid with Chlorpromazine Hydrochloride and Potassium Iodide

Abstract Electrochemical oxidation of l-ascorbic acid by a chlorpromazine and a potassium iodide at a platinum electrode in 5 × 10−1 M K2SO4 + 5 × 10−1 M KHSO4 has been studied. l-Ascorbic acid was the oxidation product, which has been verified by spectrophotometry and potentiometry. The rate constant for the catalytic reaction was evaluated as (6.4 ± 0.05) × 103 M−1 s−1 for a chlorpromazine and as (7.4 ± 0.04) × 103 M−1 s−1 for a potassium iodide. Experimental conditions, which maximize the current efficiency of this electrochemical oxidation, such as pH value and the concentration of the catalyst, were also investigated and discussed in this article.