离子色谱法同步测定饮用水中5种污染物指标

Synchronous Determination of Five Pollutants Indices in Drinking Water Using Ion Chromatography

为了避免当样品较多、检测设备数量有限时,生活饮用水样品保存时间过长,影响检测结果的准确性,通过优化离子色谱条件,研究构建了一种同步测定生活饮用水中5种污染物指标的方法,包括二氯乙酸(DCAA)、三氯乙酸(TCAA)、亚氯酸盐(ClO_(2)^(-))、氯酸盐(ClO_(3)^(-))、溴酸盐(BrO_(3)^(-))。生活饮用水样品经过OnGuardⅡBa/Ag/H柱、0.2μm微孔滤膜后进样,进样体积为350μL,流量为1.00 mL/min,色谱柱采用IonPac AS27阴离子色谱柱,利用淋洗液在线发生器设置洗脱浓度,用ICS-5电导检测器测定。开展线性、检出限、测定下限、加标回收率以及精密度试验,结果表明:5种污染物标准曲线线性相关系数(r)均大于0.999,加标回收率为95.5%~102.0%;相对标准偏差(RSD)为0.3%~2.6%。5种污染物能在44 min内完成检测。该方法具有良好的灵敏度、准确度和精密度,可用于生活饮用水的日常监测,提高检测效率。

In order to avoid the impact on the accuracy of detection results in the long term storage of drinking water samples when there are a large number of samples and limited detection equipment.This study developed a method to synchronously determine five pollutants indices in drinking water by optimizing ion chromatography conditions,including dichloroacetic acid(DCAA),trichloroacetic acid(TCAA),chlorite(CIO_(2)^(-)),chlorate(CI_(3)^(-)),and bromate(BrO_(3)^(-)).Drinking water samples were determined after going through OnGuard I Ba/Ag/H column and 0.2μm microporous filter membrane;Injection volume was 350μL;The flow rate was 1.0 mL/min;The chromatography column was IonPac AS27 anion chromatography column;Gradient elution was achieved using an online eluent generator;The results were tested by ICS-5 conductivity detector after reduction of the back-ground value by a suppressor.The linearity,detection limit,quantitative limit,recovery rate and precision were tested.The results showed that the linearities of the standard curves for 5 pollutants were good,with correlation coefficients(r)more than 0.999;The recovery rates were from 95.5%to 102.0%,and the relative standard deviations(RSD)were from 0.3%to 2.6%.The detection of 5 pollutants that can be completed within 44 minutes.This method has the characteristics of good sensitivity,accuracy and precision.It can be used for daily monitoring of drinking water to improve the detection efficiency.