大体积进样离子色谱法测定生活饮用水中的10种阴离子  

Determination of ten anions in drinking water by ion chromatography with large volume injection

作　　者：倪承珠 郝伟[1] 张海君[1] NI Cheng-zhu;HAO Wei;ZHANG Hai-jun(Taizhou Municipal Center for Disease Control and Prevention,Zhejiang 318000,China)

机构地区：[1]台州市疾病预防控制中心,浙江318000

出　　处：《中国卫生检验杂志》2023年第23期2829-2832,共4页Chinese Journal of Health Laboratory Technology

基　　金：浙江省医药卫生科技计划项目(2022RC298)。

摘　　要：目的为建立一种大体积进样离子色谱方法同时测定生活饮用水中的氟离子、氯离子、硝酸盐、硫酸盐、溴酸盐、亚氯酸盐、氯酸盐、二氯乙酸、三氯乙酸和草甘麟的含量。方法水样经0.22um滤膜过滤,200μl大体积进样分析,利用淋洗液发生装置实现流动相KOH溶液梯度淋洗,并探究2种不同梯度淋洗模式的检测效果,流速为1.0ml/min,通过IonPacAS19分析柱分离,电导检测器检测。结果氟离子、氯离子、硝酸盐、硫酸盐、草甘麟在0.05mg/L~10.0mg/L,溴酸盐、亚氯酸盐、氯酸盐在0.005mg/L~0.2mg/L,二氯乙酸、三氯乙酸在0.01mg/L~0.2mg/L浓度内线性相关系数均>0.9990,加标回收率为90.2%~116.1%,相对标准偏差均<2.75%(n=5),方法检出限为0.2μg/L~5.3μg/L(S/N=3)。该方法能有效分离生活饮用水中的10种阴离子,满足实际样品的检测需求。结论本方法操作简单、灵敏度高、准确性好,可用于生活饮用水中氟离子、氯离子、硝酸盐、硫酸盐、溴酸盐、亚氯酸盐、氯酸盐、二氯乙酸、三氯乙酸和草甘麟的测定.Objective This paper aims to establish a method for the simultaneous determination of fluoride,chloride,nitrate,sulfate,bromate,chlorite,chlorate,dichloroacetic acid,trichloroacetic acid and glyphosate concentrations in drinking water by ion chromatography with large volume injection.Methods Drinking water samples were filtered through O.22μm filter mem-brane and mass injection of 200μl was adopted for analysis.Gradient leaching of mobile phase KOH solution was realized by a leach generation device,and the detection effect of two different gradient leaching modes was explored.The flow rate was 1.O ml/min,which was separated by IonPac AS19 analysis column and detected by conductivity detector.Results The corre-lation coefficients(r)were greater than 0.9990 and the recoveries were within 90.2%-116.1%when fluoride,chloride,nitrate,sulfate and glyphosate were in the range of 0.05 mg/L-10.0 mg/L,bromate,chlorite,chlorate were in the range of 0.005 mg/L-0.2 mg/L,and dichloroacetic acid and trichloroacetic acid were in the concentrations of 0.01 mg/L-0.2 mg/L.The relative standard deviations(RSD)were all less than 2.75%(n=5).The detection limits were within 0.2μg/L-5.3μg/L(S/N=3).This method could effectively isolate ten anions and meet the requirements for practical sam-ple testing.Conclusion The method is simple,sensitive,and accurate.It can be used for the detection of fluoride,chloride,nitrate,sulfate,bromate,chlorite,chlorate,dichloroacetic acid,trichloroacetic acid,glyphosate in drinking water.

关 键 词：离子色谱法 大体积进样 生活饮用水 阴离子 

分 类 号：O657.7[理学—分析化学]