Analysis of 500-ng/l levels of bromate in drinking water by direct-injection suppressed ion chromatography coupled with a single, pneumatically delivered post-column reagent

• Published in: Journal of Chromatography A Vol. 850; no. 1; pp. 119 - 129
• Main Authors: Wagner, Herbert P, Pepich, Barry V, Hautman, Daniel P, Munch, David J
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 30.07.1999; Elsevier
• Subjects: Analytical chemistry; Applied sciences; Biological and medical sciences; Borates - analysis; Bromate; Bromides - chemistry; Carcinogenesis, carcinogens and anticarcinogens; Chemical agents; Chemistry; Chlorides - chemistry; Chromatographic methods and physical methods associated with chromatography; Chromatography, Ion Exchange - instrumentation; Chromatography, Ion Exchange - methods; Dianisidine; Dianisidine - chemistry; Drinking water and swimming-pool water. Desalination; Exact sciences and technology; Indicators and Reagents; Inorganic anions; Medical sciences; Nitric Acid - chemistry; Other chromatographic methods; Pollution; Potassium Compounds - chemistry; Quality Control; Software; Temperature; Tumors; Water - chemistry; Water treatment and pollution; Dianisidine; Derivatization, LC; Water analysis; Bromate; Inorganic anions; Drinking water treatment; Drinking water; Chemical analysis; Bromates; Interference; Disinfection; Derivatization; Postcolumn; Carcinogen; Ozonization; Ion chromatography; Inorganic anion; Sample preparation; By product; Quantitative analysis; Ultraviolet visible spectrometry
• ISSN: 0021-9673
• DOI: 10.1016/S0021-9673(99)00031-X

In July 1997, the US Environmental Protection Agency (EPA) began sampling and analyzing drinking water matrices from US municipalities serving populations greater than 100 000 for low-level bromate (>0.20 μg/l) in support of the Information Collection Rule (ICR) using the selective anion concentration (SAC) method. In September 1997, EPA published Method 300.1 which lowered the Method 300.0 bromate method detection limit (MDL) from 20.0 to 1.4 μg/l. This paper describes the research conducted at the EPA’s Technical Support Center laboratory investigating a single post-column reagent, o-dianisidine (ODA), which has been successfully coupled to EPA Method 300.1 to extend the MDL for bromate. Initial studies indicate that this method offers a MDL which approaches the EPA’s SAC method with the added benefit of increased specificity, shortened analysis time and reduced sample preparation. The method provides excellent ruggedness and acceptable precision and accuracy with a bromate MDL in reagent water of 0.1 μg/l, and a method reporting limit of 0.50 μg/l.