High selective determination of bromate in ozonized water by using ion chromatography with postcolumn derivatization equipped with reagent preparation device

A sensitive and selective ion chromatographic determination method of bromate with postcolumn conversion into tribromide by hydrobromic acid has been developed. A high precision determination of bromate was performed by using the on-line hydrobromic acid generator employing a cation exchange hollow fiber. Under optimized conditions, the performance for bromate determination was obtained as given below. The detection limit (S/N=3) for a bromate injection of 0.1 ml was 0.35 μg l−1. The linear range was over 4 orders of magnitude, from 0.5 μg l−1 to 10 mg l−1. The relative standard deviation (RSD) for 1 μg l−1 of bromate solution was 4.6% (n=10). The postcolumn derivatization systems combined with suppressed conductometric detection was applied to the simultaneous determination of bromate and common anions, such as fluoride, chloride, nitrite, bromide, phosphate, sulfate, and nitrate, in drinking water.