大体积直接进样离子色谱法同时测定饮用水中亚氯酸盐、氯酸盐和溴酸盐

目的 建立大体积直接进样离子色谱法同时测定生活饮用水中亚氯酸盐、氯酸盐和溴酸盐的方法。方法 采用IonPac AS19阴离子交换色谱柱为分离柱，通过EGC Ⅲ KOH淋洗液自动发生器在线产生KOH淋洗液，大体积直接进样，以梯度淋洗的方式同时测定生活饮用水中亚氯酸盐、氯酸盐和溴酸盐。结果 方法的线性范围亚氯酸盐和氯酸盐在25.0～800 μg/L，溴酸盐为2.00～80.0 μg/L，线性相关系数为0.9987～0.9999，3种物质检出限均为1 μg/L，回收率为98.2%～101%之间。将该方法运用于英国FAPAS生活饮用水中氯酸盐、溴酸盐、亚氯酸盐检测的能力验证中，结果（Z≤2）均为满意，其中溴酸盐的Z值为0。结论 本方法操作简单，分离效果好，灵敏度高，准确度好，精密度高，可用于饮用水中亚氯酸盐、氯酸盐和溴酸盐的检测。

Simultaneous determination of chlorite,chlorate, and bromate in drinking water by ion chromatography with large volume direct injection

Objective The study was conducted to establish a method for simultaneous determination of chlorite, chlorate, and bromate in drinking water by ion chromatography with large volume direct injection. Methods The IonPac AS19 anion exchange column was used as the separation column, and KOH eluent was produced real-time by the automatic EGC III KOH eluent generator. Drinking water samples were directly injected in large volume and subjected to gradient elution to determine the contents of chlorite, chlorate, and bromate. Results The linearity ranges were 25.0-800 μg/L for chlorite and chlorate, and 2.00-80.0 μg/L for bromate. The correlation coefficients were 0.9987-0.9999. The detection limits of the method on the three compounds were 1 μg/L. The recovery rate ranged between 98.2% and 101%. Validation of the capability of this method in detecting chlorate, bromate, and chlorite according to the FAPAS proficiency testing schemes showed that the detections were satisfactory (∣Z∣≤2) and the Z value for bromate was tested 0. Conclusion The method is simple, effective, highly sensitive, accurate and precise, and is suitable for the determination of chlorite, chlorate, and bromate contents in drinking water.