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Collision‐induced dissociation mass spectrometry of the herbicide diclofop‐methyl
Author(s) -
Headley John V.,
Peru K. M.,
Brooks Paul W.
Publication year - 1994
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290080612
Subject(s) - chemistry , ion , collision induced dissociation , dissociation (chemistry) , mass spectrometry , mass spectrum , polyatomic ion , analytical chemistry (journal) , molecule , computational chemistry , tandem mass spectrometry , organic chemistry , chromatography
The collision‐induced dissociation (CID) spectra of positive ions of the herbicide diclofop‐methyl are reported. The results indicate that for relatively low collision energies (⩽75eV, laboratory frame of reference), the distribution of the CID ions of the molecular ion correlates in a qualitative manner with the occurrence of transformation products arising from the degradation of the herbicide in geologic or biofilm materials. At low collision energies (30‐45 eV, laboratory frame of reference), the CID spectra contained a preponderance of product ions at m / z 281 and 253. These product ions correspond to prevalent transformation products in soil, 4‐(2,4‐dichlorophenoxy)dehydrophenetole (molecular ion 282) and 4‐(2,4‐dichlorophenoxy)phenol (molecular ion 254) respectively. At higher collision energies (⩾45eV), product ions were observed for up to three bond cleavages. The high energy CID product ions correspond to transformation products observed in mature biofilm materials cultivated on the parent herbicide as the sole carbon source.