茶叶中三氯杀螨醇残留量的微波萃取-固相微萃取-气相色谱快速检测方法  被引量:11

Rapid determination of dicofol in Chinese teas by GC/ECD using microwave-assisted extraction associated with solid phase microextraction

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作  者:曾景斌[1] 林泽泉[1] 余彬彬[1] 张茂升[1] 陈曦[1] 

机构地区:[1]厦门大学化学化工学院化学系现代分析科学教育部重点实验室,厦门361005

出  处:《分析试验室》2008年第2期77-80,共4页Chinese Journal of Analysis Laboratory

基  金:福建省科技重点(2005I-030,2006Y005)项目资助

摘  要:建立了微波辅助萃取-固相微萃取-气相色谱/电子捕获检测法快速测定茶叶中三氯杀螨醇的方法。采用自制的PDMS萃取头,优化了萃取溶剂的种类,微波辐射时间和微波功率等微波辅助萃取条件;研究了SPME萃取时间、搅拌速度、离子强度、解吸温度和解吸时间对萃取效率的影响。方法对三氯杀螨醇的检出限为0.048ng/mL,线性范围为0.2~200ng/mL。在优化的实验条件下,对鸟龙茶进行添加回收试验,平均回收率为61.3%~72.8%,相对标准偏差为8.0%~16.3%。本方法适合于茶叶中痕量三氯杀螨醇快速检测。A microwave-assisted extraction (MAE) associated with solid phase microextraction (SPME) followed by gas chromatography-electron capture detector (GC-ECD) was developed for the determination of dicofol in tea samples. We used the homemade PDMS fiber as the SPME material in the experiment. The MAE conditions, such as the extraction type, irradiation time and irradiation power were optimized. Several factors influencing the SPME extraction efficiency such as extraction time, stir speed, ionic strength, desorption temperature and desorption time were investigated. The linear range of the method was from 0.2 to 200 ng/mL, and the detection limit was 0.048 ng/mL. Spiked tea samples were analyzed under the optimum MAE and SPME conditions. Recoveries of this method were between 61.3% and 72.8%, and the repeatability was found to be 8.0% - 16.3%. The processed approach provides a simple and sensitive method for the rapid determination of dicofol in tea samples.

关 键 词:三氯杀螨醇 微波辅助萃取 固相微萃取 气相色谱 

分 类 号:O557.7[理学—热学与物质分子运动论]

 

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