MULTIRESIDUE ANALYSIS OF 79 PESTICIDES IN STRAWBERRY, GREEN BEAN PODS, GRAPES AND PEACH FRUITS BY SOLID-PHASE EXTRACTION (SPE) AND GAS CHROMATOGRAPHY

Five solvents (n-pentane, ethyl acetate, dichloromethane, ethanol and iso propanol) were tested for extraction of six pesticides (lufenuron, chlorfenapyr, penconazole, diniconazole, difenoconazole and azoxystrobin) from strawberry, green bean pods, grapes and peach. pentane gave the cleanest extracts in comparison with the used solvents, thus it was used in the extraction of tested pesticides from the samples. clean up using c_18 cartridge resulted in higher recovery than using silica gel and florisil cartridges. a fast and easy multiresidue analytical method is presented for identifying and inspecting 79 pesticide residues, including organochlorine, organophosphate, synthetic pyrethroids and other pesticides in fruits and vegetables. pesticide residues were extracted from samples with pentane followed by solid phase extraction. c_18 cartridge was chosen for further clean-up of the extract and elution with pentane and ethyl acetate. sixty-two and 17 pesticides were determined, by gas chromatography with an electron capture detector (gc-ecd) and a flame photometric detector (gc-fpd), respectively. the recovery rates for most pesticides in various fruits and vegetables were 80-109% with relative standard deviations < 9%.