离子色谱法测定水中消毒副产物

Determination of disinfection by-products in water by ion chromatography

目的:建立大体积进样电导检测离子色谱法同时测定水中溴酸盐、亚氯酸盐、氯酸盐、二氯乙酸、三氯乙酸5种消毒副产物含量的方法。方法:采用Dionex IonPac AS-19高容量分析柱,进样体积为500μl,淋洗液自动发生装置在线产生KOH梯度洗脱,抑制型电导检测,柱温25℃～26℃,35 min内同时测定消毒副产物和水中常规阴离子。结果:测定的5种消毒副产物在5μg/L～2000μg/L浓度范围内呈良好线性关系,检出限低,测定相对标准偏差均小于3%,回收率在84%～117%之间。结论:该方法操作简便,实用性强,结果可靠。

Objective：To establish a new conductivity detection ion chromatography determination method for contents of BrO3^-, ClO2^-, ClO3^-, DCAA, TCAA in water by the large volume direct injection. Methods： In the suppressed conductivity detection, Dionex IonPac AS19 column was used as separation column, sample injection volume at 500 μl, with KOH gradient elution generated by on - line eluent generator. Column temperature was 25℃ 26℃. DBPs and conventional anion in water were detected in 35 min at the same time. Results： The DBPs con- tent showed good linearity within the concentration range of 5 p^g/L N 2000 i^g/L. Limit of determination was low. Relative standard deviations （RSD） was less than 3% , recoveries were between 84% - 117%. Conclusion： The method is simple, practical and reliable.