Negative-ion fast atom bombardment mass spectrometry of sulfonylurea herbicides

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Eur. J. Mass Spectrom. 2, 43 - 47 (1996)

Negative-ion fast atom bombardment mass spectrometry of sulfonylurea herbicides

Witold Winnik, William C. Brumley^* and Leon D. Betowski
United States Environmental Protection Agency, National Exposure Research Laboratory, Characterization Research Division, Las Vegas, Nevada 89193, USA.

ABSTRACT:

Seven sulfonylurea herbicides were studied using negative-ion fast atom bombardment mass spectrometry (FAB-MS). The spectra were characteristic of the structure of the examined herbicides with fragmentation at the sulfonylurea bridge representing both aromatic moieties. The fragmentation pattern was established based on the FAB-B/E mass spectrometry/mass spectrometry linked-scan spectra. Background-subtracted negative ion FAB-MS spectra of the herbicides exhibit [M 1] peaks and their fragmentation products. Application of triethylenetetramine as a FAB matrix resulted in enhanced fragmentation. The 3-nitrobenzyl alcohol FAB spectra typically exhibited high-abundance [M 1] peaks and fewer fragmentpeaks.

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