• AWWA JAW60489

AWWA JAW60489

Journal AWWA - Chlorite Ion Interference in the Spectrophotometric Measurement of Chlorine Dioxide

American Water Works Association , 09/01/2004

Publisher: AWWA

File Format: PDF

$15.00$30.00


Chlorine dioxide (ClO2) is used at many water treatment plants for disinfecting potable water. In such applications, having a simple, convenient, and reliable analytical method to measure the concentration of ClO2 can simplify the use of it as a disinfectant. However, the presence of the Cl2O4- complex, which forms in ClO2 solutions in the presence of chlorite ion, can result in significant error in the spectrophotometric measurement of ClO2. In this article, the authors demonstrate the significance of the Cl2O4- complex and report the formation constant (Keq) and the molar absorptivity of this complex. Based on the Keq and the molar absorptivity values, the authors propose two methods to correct for the presence of the complex and suggest the use of one equation in particular. By using the equation suggested, the authors demonstrate that the error of the determined ClO2 concentrations is reduced to the level of errors associated with the spectrophotometric measurements. Includes 16 references, tables, figures.

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