Chinese Journal of Chromatography

• Articles • Previous Articles     Next Articles

Determination of 92 pesticide residues in tea by gas chromatography with solid-phase extraction

LOU Zhengyun, CHEN Zongmao, LUO Fengjian, TANG Fubin, LIU Guangming   

  1. Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China
  • Received:2008-10-27 Revised:2008-10-27 Online:2008-10-27 Published:1983-09-25
  • Contact: CHEN Zongmao

Abstract: A multiresidue analytical method was developed for the determination of ninety-two pesticides in tea using solid-phase extraction (SPE) and gas chromatographic determination. Tea samples were extracted with acetonitrile, organophosphorus pesticides were clean-up by an Envi-Carb SPE cartridge, eluted with 10 mL acetonitrile-toluene (3∶1, v/v) and determined by gas chromatography-flame photometric detection (GC-FPD); organochlorine pesticides and pyrethroids pesticides were cleaned-up by Envi-Carb+NH2 SPE cartridges, eluted with 5 mL acetonitrile-toluene (3∶1, v/v) and determined by gas chromatography-electron capture detection (GC-ECD). The recoveries of those pesticides were ranged from 80.3% to 117.1% by fortification test with the relative standard deviations being from 1.5% to 9.8%. The limits of detection were 0.0025-0.10 mg/kg. The proposed method is characterized by simplicity, higher sensitivity and accuracy.

Key words: gas chromatography (GC), multiresidue determination, pesticides, tea , solid-phase extraction (SPE)