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抑制型电导检测离子色谱法测定饮用水中的痕量溴酸盐 应 波, 李淑敏, 岳银玲, 鄂学礼 (中国疾病预防控制中心环境与健康相关产品安全所,北京100050) 摘要:建立一种直接进样测定饮用水中痕量溴酸盐的电导检测离子色谱法。选用 Metrosep A Supp 5 阴离子交换分离柱,碳酸盐淋洗液。抑制型电导检测采用化学抑制器和CO, 抑制器顺序双抑制系统。实验结果显示,溴酸根阴离子与常见共存阴离子完全分离,溴酸盐含量在5~100 ug/L范围内具有良好的线性(r=0.9999),精密度高(相对标准偏差(RSD)<4%),方法的检出限为0.50 ug/L,样品加标平均回收率为96.1%~107%。该方法操作简单,分离效果好,可与常见阴离子实现同时分析,灵敏度高,重现性好,可作为饮用水中溴酸盐的标准测定方法. 关键词:离子色谱法;溴酸盐;饮用水 Determination of Trace Bromate in Drinking Water by IonChromatography with Suppressed Conductivity Detection YING Bo, LI Shumin, YUE Yinling, E Xueli (Institute for Environmental Health and Related Product Sofety, Chinese Centerfor Disease Control and Prevention, Beijing 100050, China) Abstract: Bromate is a common disinfection by-product produced from the ozonation of sourcewater containing bromide. An ion exchange chromatographic method with suppressed conduc-tivity detection for the determination of trace bromate in drinking water was developed. Theseparation of the bromate in drinking water was achieved on a Metrosep A Supp 5 anion ex-change column and a Metrosep A Supp 4/5 Guard column with a carbonate eluent. A new dualsuppressed system, an MSMⅡ chemical suppressor combined with a CO, suppressor, was usedto suppress the background conductivity, and to improve the detection limit of bromate. Ionchromatographic experiments were carried out by using a Metrosep A Supp 5 anion exchangecolumn with a suppressed conductivity detector and an eluent of 3.2 mmoL/L Na,CO,-1.0mmol/L NaHCO, at a flow rate of 0.65 mL/min. This method had good linearity(r=0.999 9)in the range of5-100 ug/L and high precision (relative standard deviation (RSD)<4%) forthree concentration levels of bromate. The average recoveries of the spiked samples includingtap water, pure water and mineral water were 96.1%-107%, and the detection limit for bro-mate was 0. 50 ug/L. This method has a simple operation procedure, good separation results,high sensitivity and good repeatability. It can be used as a standard method for the determina-tion of bromate in drinking water. Key words: ion chromatography; bromate; drinking water
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