A simple sample preconcentration technique for the determination of trace level of bromate and perchlorate in drinking water with ion chromatography is presented. With the hydrophobic anion-exchange column and a sodium hydroxide eluent in linear gradient, bromate and perchlorate can be determined in a single injection within 35 min. Prior to ion chromatographic analysis, the drinking water sample was treated with the OnGuard Ag cartridge to remove the superfluous chloride and concentrated in 20-fold with poly(tetrafluoroethylene)(PTFE) beaker in a domestic microwave oven in 15 min. The recoveries of the analytes are better than 90%. The detection limits for bromate, perchlorate, iodate and chlorate were 0.10 microgram/L, 0.20 microgram/L, 0.11 microgram/L and 0.21 microgram/L, respectively. The developed method is applicable for the quantitation of bromate and perchlorate in real drinking water samples.
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