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AWWA QTC97051
- Comparison of the ACVK and LGB Methods for Measuring Chlorine Dioxide in Drinking Water
- Conference Proceeding by American Water Works Association, 01/01/1997
- Publisher: AWWA
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Chlorine dioxide is a strong disinfectant, small concentrations of which are capable of meeting most disinfection requirements such as those specified in the Surface Water Treatment Rule for Giardia and virus inactivation. To accurately measure low chlorine dioxide concentrations for process control requires a very good analytical method. In recent years, several spectrophotometric methods for measuring chlorine dioxide have been developed which reportedly provide very low detection limits, while remaining largely free of interferences from other chlorine species which plagued earlier methods. This study evaluated and compared two such methods, one of which involves the use of acid chrome violet K (ACVK) reagent and the other lissamine green B (LGB) reagent. The specific objectives of the study were: to evaluate and compare the precision, sensitivity and linear range of the two methods; to evaluate the performance of each method over various temperatures to identify possible performance deterioration; to explore the lack of interference by other chlorine species and potassium permanganate; and to confirm method performance in field samples.
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