高压离子色谱法同时测定自来水中12种无机阴离子

Simultaneous Determination of 12 Inorganic Anions in Tap Water by High Pressure Ion Chromatography

建立高压离子色谱法同时测定自来水中 12 种(F^(-),Cl O_(2)^(-),Br O_(3)^(-),Cl^(-),NO_(2)^(-),Cl O_(3)^(-),Br^(-),NO_(3)^(-),SO_(4)^(2-),I^(-),Cr O_(4)^(2-),PO_(4)^(3-))无机阴离子的含量。选用 Ion Pac AS19 分离柱,以自动发生装置在线产生 KOH 作淋洗液,流速为 1.8 m L/min,进样体积为 100 μL,抑制器电流为 143 m A。结果表明:通过高压技术,可实现 12 种目标物在 20 min 内的有效分离,锋面积与浓度具有良好的线性关系(r≥0.9991),样品加标回收率为 92.9 %~109.8 %,相对标准偏差(RSD)为 0.51 %~4.13 %;通过 A 类、B 类不确定度分量评定,12 种目标物的方法相对扩展不确定度范围在 1.30 %~4.07 %。

A high pressure ion chromatography method was established for the simultaneous determination of 12 inorganic anions (F^(-),Cl O_(2)^(-),Br O_(3)^(-),Cl^(-),NO_(2)^(-),Cl O_(3)^(-),Br^(-),NO_(3)^(-),SO_(4)^(2-),I^(-),Cr O_(4)^(2-),PO_(4)^(3-)) in tap water.Ion Pac AS19 eluent automatic generator and suppressed conductivity detector were used to produce KOH eluent on-line,which the flow rate was 1.8 m L/min.The injection volume was 100 μL and the current of suppressor was 143 m A.The results showed that:through high pressure technology,the 12 anions were separated within 20 min,which the linear relationship between the front area and the concentration was great(r≥0.9991).The recoveries were 92.9 %~109.8 %,and the relative standard deviations (RSD) were 0.51 %~4.13 %.The relative expanded uncertainty of the 12anions were 1.30 %~4.07 % by the evaluation of class A and class B uncertainty components.