测定茶叶中27种有机氯和拟除虫菊酯农药多组分-中国食品卫生杂志.pdfVIP

论著 测定茶叶中27 种有机氯和拟除虫菊酯农药多组分残留气相色谱法 蒋定国　方从容 　杨大进 　王竹天 ( 中国疾控中心营养与食品安全所 ,北京 　10002 1) 摘 　要 :为了更有效地对我国茶叶的质量和安全性进行监管 ,建立了一种快速测定茶叶中20 种有 机氯和 7 种拟除虫菊酯农药多残留的气相色谱法 。试样中农药残留在超声波振荡条件下用乙腈提 取 ,提取液经氮气流浓缩和 Florisil 固相萃取小柱净化 ,用气相色谱 - 电子捕获检测器测定 ,色谱柱 ( μ ) μ 为 HP - 5 小口径石英毛细管柱 30 m ×032 mm ×025 m 。农药的添加水平在 60～228 gkg 范 围时 ,在绿茶中的平均添加回收率为 712 %～115 % ,相对标准差为 342 %～189 % ;在花茶中的平 均添加回收率为 711 %～12 1 % ,相对标准差为 355 %～192 % 。方法的检测限范围为 012～60 μ gkg 。该方法快速 、灵敏 、准确 、成本低 ,能满足农药多残留快速扫描的分析要求 。 关键词 :茶叶;色谱法 ,气相 ;农药残留量 ;杀虫剂 ,有机氯 ;除虫菊酯类 Determination of 27 organochlorine and pyrethroid pesticide multi - residues in teas by gas chromatography J IAN G Dingguo , FAN G Congrong , YAN G Daj in , WAN G Zhutian (National Institute for Nutrition and Food Safety , Chinese CDC , Beij ing 10002 1 , China) Abstract : To control the pesticide residues in tea , a rapid and sensitive method has been established for the determination of 27 organochlorine and pyrethroid pesticide multiresidues in teas. The pesticide residues in tea samples were extracted with acetonitrile and by ultrasonic , the extracts were concentrated with stream of nitrogen , cleaned up by Florisil solid phase extraction column , and then determined by gas chromatography with electron capture detector . The column used was HP5 capillary column (30 m ×032 mm ×025 μ ) m Twenty organochlorine and 7 pyrethroid pesticide multiresidues in teas were determined by this method . When pesticide residues in teas were at the 60～228