生活饮用水中消毒副产物及阴离子的离子色谱测定法

目的 建立生活饮用水中几种常见阴离子和消毒副产物测定的离子色谱法。方法 水样经Metrosup A Supp 7-250/4.0阴离子色谱柱(250mm×4.0mm)分离,以3.2mmol/L Na2CO3-2.1mmol/L NaHCO3为淋洗液在流速为1.0ml/min条件下等度洗脱,抑制型电导检测器检测。结果 该法各目标物相关系数r>0.996,检出限在0.0002mg/L~0.0033mg/L之间,加标回收率为88.08%~107.8%,相对标准偏差在2.31%以内(n=6)。结论 该法直接进样,只需22min即可实现生活饮用水中7种阴离子的定量测定,满足国家限量标准要求,适合基层单位大批量多批次样品的测定。

Simultaneous determination of common anions and disinfection by-products in drinking water by ion chromatography

Objective To establish a method for the simultaneous determination of common anions and disinfection by-products in drinking water by ion chromatography with a suppressor conductivity detector.Methods The separation was performed on the Metrosup A Supp 7-250/4.0 anion column(250 mm 4.0 mm),and the target compounds were eluted with 3.2 mmol/L Sodium carbonate and 2.1 mmol/L Sodium bicarbonate at the flow rate of 1.0 ml/min in isocratic.It was detected by suppressor conductivity detector.Results The correlation coefficients of the target compounds were all above 0.996,and the detection limit was between 0.0002mg/L-0.0033mg/L.The recovery rate was between 88.08%-107.8%,besides,the RSD(n=6)was within 2.31%.Conclusion Seven kinds of anions could be quantitative detected which needed only 22min by directly injecting.In the meantime,the method could satisfy the national limited standard requirements,which was suitable for high-volume multi-batch samples of the determination.