LIQUID-CHROMATOGRAPHY PARTICLE-BEAM MASS-SPECTROMETRY DETERMINATION OF CARBAMATES IN LETTUCE AND APPLE

A method for extraction and determination of trace amounts of Carbaryl , Baygon, Methiocarb, and Methiocarb sulfoxide in lettuce and apple sa mples is described. The arrangement liquid chromatography-particle bea m-mass spectrometry offers the possibility of confirmation and determi nation of these carbamates at concentrations lower than those admitted by the European Union. Recoveries of carbamates at the 0.16-4.9 mg/kg level were between 53 and 76% with standard deviation between 6 and 1 2% (n = 5). Detection limits for analytes single ion monitoring mode w ere 5, 30, 10, and 20 ng for Methiocarb sulfoxide, Baygon, Carbaryl, a nd Methiocarb, respectively.