关键词: 茶叶, 有机氯类农药, 气相色谱法

Abstract: Objective To determine 12 organochlorine pesticide residues in Tea by capillary gas chromatography with electron capture detector (CGC- ECD). Method Samples were extracted by FDA method. The capillary column was DB- 1(30m× 0.25mm × 0.25μ m);injector temperature was 250℃ and detector temperature was 280℃ ;The column temperature program was initial temperature 150℃ with rate of 15℃ /min to 180℃ (hold 1min), rate of 10℃ /min to 210℃ (hold 2min),and rate of 15℃ /min to 240℃ (hold 10min). The pesticide residues were calculated by external standard method. Results the average recoveries and RSD ranged from 80.1% to 103.8% and 0.52% to 6.21% respectively, at three spiked mixed organochlorine pesticide levels. All the samples showed organochlorine pesticide residues. Conglusion The method is easy in operation and has good separation and repeatability.

Key words:  , Tea Organochlorine pesticide residues Capillary gas chromatography；