液-液萃取-气相色谱法同时测定地表水中17种硝基苯类和氯苯类化合物

Simultaneously Determination for 17 Nitrobenzene-Compounds and Chlorobenzene-Compounds by Liquid-Liquid Extraction-Gas Chromatography

建立了液-液萃取-气相色谱法同时测定地表水中17种硝基苯类和氯苯类化合物的方法。水中的硝基苯类和氯苯类化合物用乙酸乙酯/正己烷(2∶1,体积比)混合溶剂提取,经DB-35ms色谱柱分离后用ECD检测。方法灵敏度高,萃取定容后即可进样分析,无需进行高倍浓缩,17种化合物分离良好,检测灵敏度高,水中检出限为0.03～0.08μg/L,比饮用水源地限值低1～4个数量级。本法在40.0～400μg/L浓度范围内线性相关性良好,方法相对标准偏差为1.4%～5.2%,实际样品加标回收率为96.3%～106%。

A liquid-liquid extraction-gas chromatography method was established to simultaneously determination for 17 kinds of nitrobenzene-compounds and chlorobenzene-compounds in ground water.A mixed solvent ethyl acetate/n-hexane（2∶ 1,V/V） was used.The 17 compounds were separated by a DB-35ms capillary column and quantitative results were acquired by electron capture detector（ECD）.The phase ratio of water to organic solvent was 10∶ 1.The extracts could be analyzed directly with no concentration.The present method has a good linearity ranged from 40.0μg/L to 400μg/L.The relative standard deviations（RSD） of parallel determination are between 1.41% to 5.18%.The spiked recoveries come to be 96.3%~106%.The method determination limits show to be 0.03~0.08μg/L,which are 1~4 orders of magnitude lower than the control limits of GB 3838-2002.