低压离子色谱法测定天然水中Cl^-,NO_3^-和SO_4^(2-)

Determination of Anions in Natural Water with Low Pressure Ion Chromatography

利用低压离子色谱法（电导检测器）测定了沈阳地区自来水、湖水、河水和雨水中的Ｃｌ－，ＮＯ－３和ＳＯ２－４。当以１．４４ｍｍｏｌ／ＬＮａ２ＣＯ３作淋洗液、流速为１．２ｍＬ／ｍｉｎ时，分离效果良好，３种阴离子的检出限分别为０．０１３６，０．２０４和０．１６１ｍｇ／Ｌ，回收率为９０％～１０４％。选定的色谱条件同样适用于ＮＯ－２和ＳＯ２－３的测定。重点讨论了用低压离子色谱法测定阴离子时在选用淋洗液组成上的局限性。

An application of low pressure ion chromatography to the analysis of natural water is described. Cl -, NO - 3 and SO 2- 4 in the local tap water, lake, river and rain waters were separated and quantified. The limits of detection for Cl -, NO - 3 and SO 2- 4 were 0.0136, 0.204, and 0.161mg/L, respectively, and the recoveries were between 90% and 104%. The optimum condition is 1.44mmol/L of Na 2CO 3 in eluent at a flow rate of 1.2mL/min. The conductivity detector was used at 1.4μΩ -1 and the sample volume injected was 20μL. Similar chromatographic condition is also suitable for determination of NO - 2 and SO 2- 3 in water samples. Furthermore, the limitations of the eluent composition used is also discussed.