Low-level bromate analysis in drinking water by ion chromatography with optimized suppressed conductivity cell current followed by a post-column reaction and UV/Vis detection

摘要: In the present work, a high capacity anion exchange column was used to efficiently and simultaneously separate traces of oxyhalide disinfection byproducts (DBP) anions bromide by an ion chromatography system followed post-column reaction (PCR). The PCR generates in situ hydroiodic (HI) acid from excess potassium iodate that combines with bromate effluent form triiodide detectable UV/Vis absorbance at 352 nm. suppressed conductivity cell current optimized 70 mA, flow rate 1.0 mL/min 9 mM carbonate eluent. Its performance investigated on trace-level determination ozonated municipal bottled drinking water. Based water matrix, method detection limit 0.27 μg BrO(-)(3)/L evaluated Method Quantification Limit (MQL) 0.89 BrO(-)(3)/L. However, ultrapure water, MDL 0.015 MRL 0.052 were achieved. recovery for spiked samples range 90%-115%.