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Two distinct methods are described for determination of residues of ethiofencarb and triforine, and of diflubenzuron, teflubenzuron, and triflumuron at the 0.01 ppm level in apple and pear pulp used for baby food; recoveries are above 50%. Diflubenzuron, teflubenzuron, and triflumuron are extracted with a 1:l mixture of dichloromethane and acetone, and the extracts are cleaned by SPE using C1g as stationary phase and methanol as mobile phase. Ethiofencarb and triforine are extracted with dichloromethane, and the extracts cleaned using the same stationary phase but a 1:l mixture of acetonitrile and water as mobile phase. Analysis of both groups of pesticides is by isocratic HPLC-UV at 210 nm using an RP-18 column and acetonitrile-water as mobile phase.

A multiresidue method is described for determination of acephate, diazinon, dimethoate, fenitrothion, malathion, pirimicarb, trichlorfon, bromopropylate, 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 analyzed by gas chromatography (GC)/electron capture detection/flame photometric detection (FPD) and GC/nitrogen-phosphorous detection/FPD. Recoveries were determined by spiking sweet cherry homogenates with 10 pesticides at 0.1, 0.05, 0.02, and 0.01 ppm. Six determinations were performed at each level for each pesticide. Recoveries were 70% or better at the 0.01 ppm level.

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