直接进样离子色谱法测定饮用水中的溴酸盐

Determination of bromate in drinking Water by direct injection ion chromatography

摘要: 目的建立了一种离子色谱法直接进样测定饮用水中溴酸盐的方法。方法选用高效高柱容的A Supp 7-250离子色谱柱，抑制型电导检测器，直接进样测定饮用水中的溴酸盐。结果当淋洗液浓度为3.6 mol/L，流速为0.7 μl/min时，保留时间接近的BrO₃^-与Cl^-能完全基线分离。溴酸盐在0~200 μg/L的浓度范围内线性良好，相关系数r=0.9996，最低检出限为3.84 μg/L，回收率在91.8~102.7%之间，RSD<4.5%。结论该方法操作简单、灵敏度高，可应用饮用水中痕量溴酸盐的检测分析。

Abstract: Objective To establish a direct injection ion chromatography method for the determination of bromate in drinking Water.Methods By means of high capacity and high efficient chromatography column, suppressor conductivity detector, bromate in drinking water was determined directly.Results When the eluent concentration was adjusted to 3.6 mol/L and the flow to 0.7 μl/min, the retention time of BrO₃^- and Cl^- was close and could be completely baseline separated. Bromate had good linearity within the concentration range of 0~200 μg/L, with co-efficient r=0.9996, minimum detectability 3.48 μg/L, recovery rate being between 91.8 and 102.7% and RSD<4.5%.Conclusion The method has the advantages of simple operation and high sensitivity, which can be used for the analysis of trace bromate in drinking water.