Abstract
Chloride-attachment negative chemical ionization mass spectra can be generated by the addition of chlorinated solvent modifiers to the high-performance liquid chromatographic mobile phase in liquid chromatography—mass spectrometry. The observed mass spectra of several organophosphorus pesticides are similar to those reported for direct probe analysis with methylene chloride as the reagent gas. For certain classes of compounds, this mode of ionization yields more structural information than does conventional negative chemical ionization mass spectrometry. The addition of chlorinated solvent modifiers to the high-performance liquid chromatographic mobile phase in liquid chromatography—mass spectrometry allows for the analysis of mixtures by chloride-attachment negative chemical ionization.
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