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

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 de...

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Bibliographic Details
Published in:International journal of mass spectrometry and ion physics 1983, Vol.48, p.323-326
Main Authors: Muszkat, Lea, Aharonson, Nadav
Format: Article
Language:English
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Summary: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.
ISSN:0020-7381
1873-3034
DOI:10.1016/0020-7381(83)87093-4