אסיף מאגר המחקר החקלאי

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

Year:

1983

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Volume :

48

Co-Authors:

Muszkat, L., Pesticide Chemistry and Residue Research Laboratory, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
Aharonson, N., Pesticide Chemistry and Residue Research Laboratory, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel

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Abstract:

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. © 1983.

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