Abstract
Eight thermally labile N-methylcarbamates, aldicarb, carbaryl, carbofuran methiocarb, methomyl, oxamyl and propoxur, the active ingredients of insecticides, and 3-hydroxycarbofuran, the metabolite of carbofuran were separated on a gas chromatographic column, detected by a mass spectrometer and confirmed by positive ion electron impact (PIEI) spectra and ammonium positive ion chemical ionization spectra. The characteristic ions suitable for selected ion monitoring using PIEI are presented. The fragmentation patterns of these carbamates demonstrated that thermal degradation has not occurred under the reported conditions.
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