Simultaneous Determination of Organochlorine and Pyrethroid Pesticide Residues in Tea of Jiangxi Province by GC-ECD

An efficient and sensitive method for simultaneous determination of eighteen organochlorine and nine pyrethroid pesticides in tea of Jiangxi Province has been established and validated.Pesticide residues were extracted from tea samples with hexane-dichloromethane(1∶1,V/V).Extracts were cleaned-up by alumina neutral-florisil column,and determined by gas chromatography equipped with electron-capture detector(GC-ECD),using DB-1701 capillary column.The recoveries of organochlorine pesticides obtained from samples spiked with standards at the concentration levels of 0.04 μg/mLand 0.01 μg/mL were in the ranges of 89.5%~113.2% and 80.0%~112.7%,with the RSD in the ranges of 3.82%~9.64% and 5.32%~13.8%,respectively.The recoveries of pyrethroid pesticides obtained from samples spiked with standards at the concentration levels of 0.2 μg/mL and 0.05 μg/mL were in the ranges of 97.5%~129.6% and 87.3%~110.2%,with the RSD in the ranges of 3.78%~10.72% and 3.02%~13.84%,respectively.A satisfactory result was obtained in the determination of organochlorines and pyrethroid in tea of Jiangxi province.