固相萃取-气相色谱法测定茶叶中多氯联苯和有机氯农药残留  

Multiresidue Determination of Organochlorines and Polychlorinated Biphenyl Congeners in Tea by Solid-Phase Extraction and Gas Chromatography

作　　者：吴林[1,2] 吴晓波 张承聪[1] 马莉莉 屈天尧 林诗云 

机构地区：[1]云南大学化学科学与工程学院,云南昆明650091 [2]云南省农药检定所,云南昆明50034

出　　处：《云南化工》2011年第2期21-24,共4页Yunnan Chemical Technology

基　　金：云南省农药检定所农药分析研究项目资助

摘　　要：建立了茶叶中15种多氯联苯（PCBs）和有机氯农药残留固相萃取（SPE）-气相色谱分析方法。用正己烷-丙酮（体积比2∶1）提取,经Envi-Carb/NH2复合固相萃取柱净化,以环氧七氯为内标,采用RTX-5毛细管柱分离,气相色谱-电子捕获检测器（GC-ECD）检测。当加标质量分数为0.03、0.07、0.2 mg/kg时,平均加标回收率为82.99%~127.10%,相对标准偏差（RSD）为1.07%~8.66%%,该方法的检测限（LOD）在0.0007~0.0110 mg/kg之间。A multiresidue analytical method for the simultaneous determination of 15 polychlorinated biphenyl congeners（PCBs） and organochlorines in tea has been developed.The sample were extracted from tea with hexane-acetone（2∶1） by using an ultrasonic bath.The extracts were purified with Envi-Carb/NH2 Solid-Phase Extraction（SPE） column,and then separated with RTX-5 capillary column,detected by gas chromatography with electron capture detector（GC-ECD）,and with heptachlor epoxide as the internal standard.The recovery studies were performed at the three spike levels of 0.03,0.07 and 0.2mg/kg,the mean recoveries were between 82.99% and 127.10% with a relative standard deviation（RSD） ranging from 1.07% to 8.66%.The limits of detection（LOD） were ranged from 0.0007 to 0.0110mg/kg.

关 键 词：茶叶 多氯联苯 有机氯农药 固相萃取 气相色谱-电子捕获检测器 

分 类 号：TQ450.263[化学工程—农药化工]