[Determination of 92 pesticide residues in tea by gas chromatography with solid-phase extraction].
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.
Lou
Zhengyun
Z
Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310008, China. louzy@zj.com
Chen
Zongmao
Z
Luo
Fengjian
F
Tang
Fubin
F
Liu
Guangming
G
D002138:Calibration; D002849:Chromatography, Gas / Q000379:methods*; D005504:Food Analysis / Q000379:methods*; D005506:Food Contamination / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D016014:Linear Models; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification*; D052616:Solid Phase Extraction / Q000379:methods*; D012997:Solvents / Q000737:chemistry; D013662:Tea / Q000737:chemistry*; D013997:Time Factors
D010573:Pesticide Residues; D012997:Solvents; D013662:Tea