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1993
Journal Article
Titel
Temperature and salt concentration effects on the ion abundances in thermospray mass spectra
Abstract
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.