Multiresidue liquid chromatographic method for simultaneous determination of pyrethroid insecticides in fruits and vegetables

A simple and rapid liquid chromatographic (LC) method has been developed for simultaneous determination of 9 pyrethroid insecticides (biphenthrin, cypermethrin, fenpropathrin, fenvalerate, flucythrinate, methothrin, permethrin, py-115, and tetramethrin) in fruits and vegetables, Residues are extracted from crops with methanol and partitioned with toluene, Extracts are cleaned up by Florisil-charcoal column chromatography, LC separation is performed on a mu Bondapak C-18 stainless steel column with acetonitrile-deionized water as mobile phase, The insecticides are detected at 206 nm with 0.03 absorbance unit full scale, Recoveries of 9 pyrethroid insecticides from 6 crops (cucumbers, tomatoes, cabbages, apples, pears, and peaches) fortified at 0.5-5.0 mg/kg were 62.7-129.2%, Detection limits were about 0.05 mg/kg, except for py-115, for which detection limit was 0.10 mg/kg.