A contribution to solving the puzzle of the chemical structure of humic substances: pyrolysis-soft ionization mass spectrometry

1992 ◽  
Vol 117-118 ◽  
pp. 27-39 ◽  
Author(s):  
H.-R. Schulten ◽  
M. Schnitzer
Keyword(s):  
Mass Spectrometry ◽  
Humic Substances ◽  
Chemical Structure ◽  
Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Soft Ionization

Chemical Ionization Mass Spectrometry of Organophosphorus Insecticides

1974 ◽  
Vol 57 (5) ◽  
pp. 1050-1055 ◽  
Author(s):  
Roy L Holmstead ◽  
John E Casida
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Structure ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Organophosphorus Insecticides ◽  
Fragmentation Patterns

Abstract The chemical ionization (CI) mass spectra of 15 important organophosphorus insecticides and 14 of their major metabolites are discussed in relation to the effect of chemical structure on fragmentation patterns. The fragments obtained with CI are sometimes quite different from those formed on electron impact and, in general, simpler spectra are obtained with CI.

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