The Column - April 2007 - (Page 23)
April 2007 www.thecolumn.eu.com The Column Rumi and Steinbach Trace-Level Determination of Bromate in Water by Ion Chromatography Achim Rumi and Alfred Steinbach, Metrohm AG, Herisau, Switzerland. This article describes an innovative method for the trace analysis of bromates in water with optimized post-column derivatization and UV/vis detection of triiodide. The disinfection of drinking water destroys pathogenic microorganisms and removes compounds that cause bad taste and/or odour. Most public water suppliers still disinfect their drinking water with chlorine. However, apart from its unpleasant taste, chlorine reacts with the ubiquitous organic compounds and forms harmful disinfection by-products (DBPs) such as the potentially carcinogenic trihalomethanes.1 To control the formation of these DBPs, several strong oxidants, including permanganate and ozone, are used. While ozone is one of the most efficient oxidants, it also oxidizes any naturally occurring bromide to bromate. Because the International Agency of Research on Cancer (IARC) has classified bromate as a potential carcinogen, bromate levels in drinking and mineral water have to be monitored. The US Environmental Protection Agency (US EPA) and the European Union (EU) currently prescribe a maximum bromate concentration of 10 parts per billion (ppb) in drinking water. For mineral waters the pertinent regulations stipulate a limit of 3 ppb. To satisfy the regulatory requirements, the determination of bromate requires very sensitive analytical methods. The most widely used methods for the quantification of bromate are based on anion exchange chromatography (AEC). While Authors: Achim Rumi and Alfred Steinbach E-mail: ast@metrohm.com 23
http://www.thecolumn.eu.com
Table of Contents for the Digital Edition of The Column - April 2007
Contents
News
Improved Isolation and Analysis of Mycotoxinsfrom Cereals, Wines and Beers
Zosimus
Pittcon 2007 Review
Trace-Level Determination of Bromate in Waterby Ion Chromatography
Q&A
The Column - April 2007
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