Determination of Organochlorine Pesticide and Pyrethroids Residues in Tea with Gas Chromatography

A method for the simultaneous determination of organochlorine pesticide and pyrethroids in tea was established by gas chromatography equipped with electronic capture detector (GC-ECD).The organochlorine and pyrethroids in tea were extracted by acetonitrile, then filtered and concentrated organic phase, and separated and purified through a florisil column, then concentrated again and diluted with hexane to scale. The organochlorine pesticide and pyrethroids were analyzed by GC-ECD and qualified with external standard method. Experiments show that seven kinds of agricultural chemicals’ peak time range from 16.362 to 32.010 min, correlation coefficient in the range of 0.9992-0.9999, with excellent linearity. The lowest examination limits range from 0.018 mg/kg to 0.099 mg/kg and the recoveries between74.5% and 116% with relative standard deviations(RSD) of 1.4%-8.7%. The results showed that proposed method could used to determine these two kinds of pesticides in tea.