A ion chromatographic method for measuring <5 mu g/L bromate ion in drinking water

Many laboratories using the best available technology (ion chromatography) can only reliably measure BrO3- at the 10-20 mu g/L level. Typically, BrO3- peak resolution is not a problem; however, finished water can contain appreciable amounts of CI-that can interfere with BrO3- measurement using conductivity detection. Chlorpromazine is a selective reagent that does not react with Cl- and is an ideal postcolumn detection chemistry following TC separation. The chlorpromazine postcolumn method is linear over the 0.5-100 mu g/L range.