Multiresidue analysis of 48 pesticides in agricultural products by capillary gas chromatography

A method for multiresidue analysis of 48 pesticides (20 organophosphorus pesticides, 7 organochlorine pesticides, 14 organonitrogen pesticides, and 7 pyrethroid pesticides) permitted in Japan was systematically developed on the basis of capillary GC. Pesticides were simultaneously extracted with acetone from vegetable and fruit samples or with acetonitrile from lipid-containing crops and then re-extracted into ethyl acetate (test solution). Pesticides in the test solution were determined by capillary GC: Organophosphorus pesticides were directly determined by FPD-GC. Organonitrogen pesticides were determined by FTD-GC (NPD-GC) following cleanup by silica gel chromatography. Organochlorine and pyrethroid pesticides were measured by ECD-GC after cleanup by Florisil column chromatography. Recoveries for 10 crops at fortification levels of 0.05-0.25 ppm were 42.5-128.5%. No pesticides tested here were detected except for banana, in which bitertanol was detected at 0.31 ppm (DBO).