March 2008, Cincinnati, OH—The EPA Office of Ground Water and Drinking Water Technical Support Center in Cincinnati, OH has approved the use of electrolytically generated hydroxide eluents and associated hydroxide-selective columns for methods 317.0 and 326.0. Both methods use addition of a post-column reagent and absorbance detection to determine trace levels of bromate. Now Reagent-Free™ IC systems with Eluent Generation (RFIC-EG™ systems) can be used for drinking water compliance monitoring of bromate using these two methods.
Bromate, formed from the ozonation of drinking waters containing bromide, is a regulated disinfection by-product with well documented toxicological effects. The U.S. EPA has established a regulatory maximum contaminant level (MCL) of 10 μg/L bromate in drinking waters. Bromate can be difficult to determine in the high-ionic-strength matrices often found in drinking waters. Post-column addition of o‑dianisidine (method 317.0) allows detection of bromate using visible light. Addition of acidified potassium iodide (method 326.0) allows UV detection of bromate ions. Absorbance detection is specific to the chromophore produced by the reaction with bromate, allowing detection of trace amounts of the anion even in the presence of co-eluting species.
Dionex Application Note 168 describes the use of an RFIC-EG system for bromate determination by EPA Method 317.0, and is available on the Dionex website at http://www1.dionex.com/en-us/webdocs/34036_34036_AN168_V27_releasedJC112105.pdf.
Dionex Application Note 171 describes the use of an RFIC-EG system for bromate determination by EPA Method 326.0, and is available on the Dionex website at http://www1.dionex.com/en-us/webdocs/34585_34585_AN171.pdf.
Dionex (NASDAQ:DNEX) is a global leader in the manufacturing and marketing of liquid chromatography and extraction systems, consumables, and software for chemical analysis. The Company's systems are used worldwide in environmental analysis and by the life sciences, chemical, petrochemical, food and beverage, power generation, and electronics industries. Our expertise in applications and instrumentation helps analytical scientists to evaluate and develop pharmaceuticals, establish environmental regulations, and produce better industrial products.
Reagent-Free and RFIC-EG are trademarks of Dionex Corporation.
