Journal
ANALYTICA CHIMICA ACTA
Volume 537, Issue 1-2, Pages 293-298Publisher
ELSEVIER
DOI: 10.1016/j.aca.2005.01.053
Keywords
anodic voltammetry; free chlorine; glassy carbon electrode; platinum
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The oxidation of free chlorine on platinum, gold, and glassy carbon disk electrodes has been investigated by using anodic voltammetry to determine the free-chlorine concentration. The voltammetric curves exhibited well-defined anodic peaks. The influences of pH, free-chlorine concentration, and potential sweep rate on the electrode response were investigated. The results show that the measurement of the oxidation peak current can be used as the basis for a simple, accurate, and rapid method for the determination of ClO-, within a concentration range of 4-400 mg Cl l(-1). The results of this method were in good agreement with those obtained by iodometric titration. Differential pulse voltammetry has also been examined, resulting in an improved sensitivity at a concentration of 1.0 mg Cl l(-1). (c) 2005 Elsevier B.V. All rights reserved.
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