液-液萃取-气相色谱法测定水中9种有机氯农药  

Determination of 9 Organochlorine Pesticides in Water Samples by Liquid-liquid Extraction-Gas Chromatography

作　　者：王娜[1] 王海娇[1] 汪寅夫[1] 李丽君[1] 

机构地区：[1]沈阳地质矿产研究所,辽宁沈阳110032

出　　处：《岩矿测试》2010年第5期497-502,共6页Rock and Mineral Analysis

基　　金：国土资源地质大调查--地下水污染测试技术研究项目资助(1212010634607)

摘　　要：采用正己烷液-液萃取法提取,气相色谱法-电子捕获检测器测定水中9种有机氯农药。优化了实验条件:添加两种替代物作为分析过程的质量监控;使用浓硫酸磺化法净化去除杂质;采用Rtx-5MS和Rtx-1701柱双柱定性,保证数据准确可靠。9种有机氯农药的方法检出限为0.0017～0.0079μg/L,回收率为74.7%～105.1%,相对标准偏差(RSD,n=7)为4.2%～9.3%,9种农药在0.5～100μg/L内与峰面积呈良好的线性关系。方法检出限低,准确度和精密度高,简便,适用于批量样品的分析。Nine organochlorine pesticides were determined by gas chromatography with electron capture detector （ECD） after samples pre-treatment by liquid-liquid extraction with n-hexane and purified with concentrated sulfuric acid.The double capillary columns of Rtx-5MS and Rtx-1701 were used for identifying the target compounds.The experimental conditions were optimized and two surrogates were chosen for quality control.The detection limits of the method for 9 organochlorine pesticides were in the range of 0.0017 ～ 0.0079 μg/L with linear ranges of 0.5 ～ 100 μg/L.The recoveries were 74.7% ～ 105.1% with the precision of 4.2% ～ 9.3% RSD （n=7）.The method provides the advantages of low detection limits,good accuracy and precision,simple operation and is suitable for routine analysis of organochlorine pesticides in water samples.

关 键 词：液-液萃取 气相色谱法 双柱定性 净化 有机氯农药 水 

分 类 号：O652.62[理学—分析化学] O657.71[理学—化学]