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Temperature and salt concentration effects on the ion abundances in thermospray mass spectra

: Volmer, D.; Preiß, A.; Levsen, K.; Wünsch, G.


Journal of Chromatography 647 (1993), pp.235-259
ISSN: 0021-9673
ISSN: 0376-737X
ISSN: 0378-4355
Journal Article
Fraunhofer ITA ( ITEM) ()
analytical; chemistry; liquid chromatography; mass spectrometry; pesticide; spectrum analysis; thermospray

The dependence of the ion abundances in the thermospray (TSP) mass spectra of several pesticides, including anilides, carbamates, N-heterocyclic and organophosphorus compounds and phenylureas on the vaporizer and the gas-phase temperatures and under collision-activated dissociation conditions was investigated. The results clearly demonstrate that fragmentation in the TSP mass spectra of the investigated pesticides was mainly caused by gas- or liquid-phase "chemical dissociation" reactions of neutral analyte molecules or, in some instances, of the quasi-molecular ions in the ion source of the vaporizer probe, probably induced by solvent or buffer ions which can be described by well defined mechanisms.