电导和直流安培双检测器离子色谱法测定清洁水样中的碘化物

选用配备了2种不同检测器(电导检测器和直流安培检测器)的离子色谱仪对稀释后过0.22μm滤膜的水样进行分析。配备有直流安培检测器的离子色谱仪测定水中碘化物的方法在0.100~20.0μg/L范围内线性关系良好,相关系数(r)=0.9999,方法检出限为0.030μg/L,测定下限为0.120μg/L,样品加标回收率为95.0%~104%,相对标准偏差为1.06%~1.64%;配备有电导检测器的离子色谱仪测定水中碘化物的方法在20.0~2.00×105μg/L范围内线性关系良好,相关系数(r)=0.9995,方法检出限为2.00μg/L,测定下限为8.00μg/L,样品加标回收率为99.0%~110%,相对标准偏差为0.71%~3.12%。离子色谱-直流安培检测器法测定水中碘化物的方法准确度高、灵敏度高、精密度好,检出限相对较低,适用于测定ρ(碘化物)≤20.0μg/L的清洁水样;离子色谱-电导检测器法主要适用于测定ρ(碘化物)≥20.0μg/L的水样。

Determination of Iodide in Clean Water by Ion Chromatography Coupled with Electrical Conductivity and DC Ampere Double Detectors

A simple and rapid ion chromatographic methodwith Electrical conductivity and DC ampere double detectors for the determination of iodide in cleanwater was established.The diluted water samples were filtered through 0.22μm filter membrane before determination.A ion chromatograph equipped with a DC ampere detector for the determination of iodide in water showed a good linear relationship with a linear correlation coefficient r=0.9999.The detection limit of the method was 0.030μg/L,and the determination of lower limit was 0.120μg/L.The standard recovery rates of the sample were in the range of 95.0%~104%,with a relative standard deviation ranged from 1.06%to 1.64%.A ion chromatograph equipped with electrical conductivity detector for the determination of iodide in water had a good linear relationship at the concentration level ranged from 20.0 to 2.00×105μg/L,with a linear correlation coefficient r=0.9995.The detection limit of the method was 2.00μg/L,and the determination of lower limit was 8.00μg/L.The standard recovery rates of the sample was in the range of 99.0%~110%,with relative standard deviations ranged from 0.71%to 3.12%.The method for determination of iodide in water by ion chromatography with DC ampere-detector has high accuracy,high sensitivity,good precision and relatively low detection limit,which is suitable for the determination of clean water samples with iodide content≤20.0μg/L.Ion chromatography with Electrical conductivity detector is mainly applicable to the determination of iodide content≥20.0μg/L in clean water samples.