Comparison of colorimetric methods for measuring chlorine dioxide concentrations in drinking water


The most commonly used form of water disinfection in the United States is chlorination. In the past twenty-five years, there has been increasing concern over the health effects of chlorinated disinfection by-products. In particular, presence of trihalomethanes (THMs) in finished drinking water has led to regulation limiting the allowed levels of THMs. The Safe Drinking Water Act set the maximum contaminant level (MCL) for THMs to 0.1 mg/L. The disinfection / disinfection by-product rule1 further reduces the MCL for THMs in a two stage plan. The first stage, which must be met by May 2001, lowers the MCL from 0.1 to 0.080 mg/L. The second stage, effective December 2003, further lowers the MCL to 0.040 mg/L. Water utilities that serve more than 10,000 customers and receive their raw water from a surface water source must comply with these regulations.

Publication Title

ACS Division of Environmental Chemistry, Preprints

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