MULTIRESIDUE METHOD FOR QUANTITATIVE GAS-CHROMATOGRAPHIC DETERMINATION OF PESTICIDE-RESIDUES IN SWEET CHERRIES

A multiresidue method is described for determination of acephate, diaz inon, dimethoate, fenitrothion, malathion, pirimicarb, trichlorfon, br omopropylate, dicofol, and tetradifon in sweet cherries for baby food at a limit of 0.01 ppm. Sweet cherry samples were extracted through a selective Extrelut column with methylene chloride and cleaned up with quaternary aminesilane-silica-dichloromethane. Extracts were then anal yzed by gas chromatography (GC)/electron capture detection/flame photo metric detection (FPD) and GC/nitrogen-phosphorous detection/FPD. Reco veries were determined by spiking sweet cherry homogenates with 10 pes ticides at 0.1, 0.05, 0.02, and 0.01 ppm. Six determinations were perf ormed at each level for each pesticide. Recoveries were 70% or better at the 0.01 ppm level.