IC Determination of Trace Amounts of Bromate and Nitrite in Bottled or Barrelled Purified Water

Contents of bromate and nitrite in bottle or barrelled purified water were determined by ion chromatography (IC). The protective column (AG19-4mm) and chromatographic column (DIONEX AS19) were used for separation, and KOH solutions of different concentrations were used as eluent. The bromate and nitrite were separated successfully. Linearity ranges of BrO3- and NO2- were found between 5.00-100.00 μg·L-1 and 1.00-50.00 μg·L-1, with detection limits (3s/k) of 0.08 and 0.14 μg·L-1 respectively. The proposed method was applied to the determination of BrO3- and NO2- in the samples of bottled or barrelled purified water, values of recovery found by standard addition method were in the range of 92.7%-98.4%, and RSD′s (n=5) were less than 5.0%.