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AWWA JAW60489
- Journal AWWA - Chlorite Ion Interference in the Spectrophotometric Measurement of Chlorine Dioxide
- Journal Article by American Water Works Association, 09/01/2004
- Publisher: AWWA
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Chlorine dioxide (ClO<sub>2</sub>) is used at many water treatmentplants for disinfecting potable water. In suchapplications, having a simple, convenient, and reliableanalytical method to measure the concentration ofClO<sub>2</sub> can simplify the use of it as a disinfectant. However,the presence of the Cl<sub>2</sub>O<sub>4</sub><sup>-</sup> complex, which forms inClO<sub>2</sub> solutions in the presence of chlorite ion, can resultin significant error in the spectrophotometric measurementof ClO<sub>2</sub>. In this article, the authors demonstrate thesignificance of the Cl<sub>2</sub>O<sub>4</sub><sup>-</sup> complex and report the formationconstant (K<sub>eq</sub>) and the molar absorptivity of thiscomplex. Based on the K<sub>eq</sub> and the molar absorptivityvalues, the authors propose two methods to correct for thepresence of the complex and suggest the use of one equationin particular. By using the equation suggested, theauthors demonstrate that the error of the determinedClO<sub>2</sub> concentrations is reduced to the level of errors associatedwith the spectrophotometric measurements. Includes 16 references, tables, figures.
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