离子色谱法测定饮用水中常见4种阴离子

Determination of 4 common anions in drinking water by ion chromatography

目的建立离子色谱法测定水溶液样品中的F-、Cl-、NO3-和SO42-的分析方法。方法用离子色谱法测定饮用水中阴离子的含量,使用电导检测器检测,淋洗液为15 mmol/L KOH,用Ion Pac AS19(250 mm×4 mm,7.9μm)阴离子分离柱、ASRS-300(4 mm)阴离子抑制器进行分离测定,一次进样25μL。结果4种阴离子相关系数为r2>0.99,回收率在96.5%~108%,相对标准偏差(relative standard deviation,RSD)(n=6)小于4%。结论该方法简便、快速、准确度高、前处理简单,适合检测饮用水中的阴离子。

Objective To establish the method for the determination of F-,Cl-,NO3-and SO42-in drinking water by ion chromatography.Methods Ion chromatography was used to determine the content of anions in drinking water,using a conductivity detector,and the eluent was 15 mmol/L KOH.An Ion Pac AS19(250 mm×4 mm,7.9μm)anion separation column and an ASRS-300(4 mm)anion suppressor were used for separation and determination.A single injection of 25μL was performed.Results The correlation coefficients of the 4 anions were bigger than 0.99,and the recoveries were between 96.5%-108%.The relative standard deviation(RSD)(n=6)was less than 4%.Conclusion This method is simple,fast,accurate,and simple to process,which is suitable for the detection of anions in drinking water.