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On-line preconcentration and determination of trace amounts of bromate in drinking water

Liang Wei, Xinshen Zhang, Yonghong Xie, Jin Hung, Kai Xiao

A simple, accurate, sensitive method was proposed for on-line preconcen tration and determination of trace amount of bromate in drinking water. Based on the decolorizing reaction resulting fromthe oxidation of methyl orange with bromate in 3.6mol L-1 hydrochloric acidmedium, the decrease percentage in color was directly proportional to the bromate amount at 510nm. The optimal experimental conditions, including reaction conditions and preconcentration conditions had been obtained.The liner range of the proposed method was between 2.5 to 100g L-1 and the detection limit was 0.76g L-1. The relative standard deviation was 1.67%for 10g L-1 bromate(n=12). Themethod has been applied successfully to bromate determination in drinking water samples and the recoveries were 96.5% 106.5%.