非平衡固相微萃取联用气相色谱测定蔬菜中残留有机磷  

Determination of OPPs residues in vegetables by non-equilibrium SPME coupled to GC

作　　者：魏善明[1] 周围 金明[3] 李利平[1] 徐英[4] 

机构地区：[1]西北师范大学地理与环境科学学院,兰州730070 [2]甘肃出入境检验检疫局,兰州730020 [3]甘肃农业大学食品科学与工程学院,兰州730070 [4]兰州生物制品研究所,兰州730046

出　　处：《分析试验室》2008年第6期115-118,共4页Chinese Journal of Analysis Laboratory

摘　　要：建立了非平衡固相微萃取与气相色谱联用测定蔬菜中残留有机磷农药的方法。探讨了影响SPME萃取效果的纤维涂层、搅拌类型、离子强度、萃取时间等因素，并对蔬菜样品的预处理进行了研究。该方法检出限分别为乙硫磷7．5ng／g；甲拌磷2．5ng／g；二嗪农5．0ng／g；异硫磷5．0ng／g；对硫磷8．3ng／g。线性范围为0．005～1μg／mL（相关系数r=0．9968）；回收率为77．6％～91．6％；相对标准偏差（RSD）为0．97％～9．0％。A method of non-equilibrium solid phase micro-extraction coupled to gas chromatography for the determination of organic phosphorus pesticides residues in vegetables has been established. Some factors influencing SPME extraction efficiency such as fibre coatings, stirring types, ionic strength, extraction time were studied. And vegetable sample pretreatment has been investigated. Good sensitivity and reproducibility were achieved with simpleness and feasibility in this method. Estimated detection limits of the method for the determination of ethion, phorate, diazinon, isofenphos and parathion in vegetables were 7.5, 2.5, 5.0, 5.0, 8.3 ng/g, The linear ranges were 0. 005 - 1 μg/mL （ r = 0.9968）. The recoveries were in the range from 77.6 % to 91.6 %, The relative standard deviations were in the range from 0.97 to 9.0.

关 键 词：非平衡固相微萃取 有机磷杀虫剂 蔬菜 气相色谱 

分 类 号：O657.7[理学—分析化学]