GC/CI/MS studies of aldicarb and butocarboxime, two isomeric oxime carbamates

Add time:08/06/2019    Source:sciencedirect.com

A direct GC/MS determination of aldicarb[2-methyl-2-(methylthio) propionaldehyde O-(-N-methylcarbamoyl) oxime] and its structural isomer butocarboxime[2-methylthio-O-(-N-methylcarbamoyl) butanone-3-oxime] is reported. Mild GC conditions, using 2% OV-17 as liquid phase provide the lowest extent of degradation. Butocarboxime is analyzed intact as its[M+H]+ ion whereas aldicarb undergoes an on column dehydration, leading to an [M-18]+ fragment with an intact carbon skeleton in the isobutane - Cl mass spectra. The GC/CI of these molecules shows characteristic fragmentation patterns which allow the mass spectrometric distinction between the two isomers.

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