Electron impact, electron capture negative ionization and positive chemical ionization mass spectra of organophosphorus flame retardants and plasticizers

2013 ◽  
Vol 48 (8) ◽  
pp. 931-936 ◽  
Author(s):  
Yuning Ma ◽  
Ronald A. Hites
Keyword(s):  
Electron Impact ◽  
Electron Capture ◽  
Mass Spectra ◽  
Flame Retardants ◽  
Chemical Ionization ◽  
Ionization Mass ◽  
Electron Capture Negative Ionization ◽  
Organophosphorus Flame Retardants ◽  
Negative Ionization ◽  
Positive Chemical 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.

Comparison of Five Ionization Methods for Producing Mass Spectra of Typical Organophosphorus Pesticides

1978 ◽  
Vol 32 (4) ◽  
pp. 388-399 ◽  
Author(s):  
Kenneth L. Busch ◽  
Maurice M. Bursey ◽  
J. Ronald Hass ◽  
G. Wayne Sovocool
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Organophosphorus Pesticides ◽  
Large Fraction ◽  
Negative Ion ◽  
Oxygen Mixture ◽  
Ion Molecule Reactions ◽  
And Migration ◽  
Positive Chemical Ionization

Positive ion mass spectra obtained by conventional electron impact and by methane chemical ionization were compared with the negative ion mass spectra of 16 typical organophosphorus pesticides using methane, a methane-oxygen mixture, and oxygen as enhancement/reagent gases. In the negative ion spectra, phosphate and phenate anions typically carry a large fraction of the ion current. Displacement of chlorine by oxygen is noted in some cases, and migration of aryl groups from oxygen to sulfur is occasionally noted. Ion-molecule reactions between two species derived from sample molecules have been observed. The sensitivity of the negative ion techniques for the pesticides examined is greater than conventional electron impact or methane positive chemical ionization techniques, and can be up to 800 times more sensitive for some compounds.

Electron impact and chemical ionization mass spectra of nitro-substituted polyfunctional isomers

1984 ◽  
Vol 19 (7) ◽  
pp. 334-342 ◽  
Author(s):  
P. S. Kulkarni ◽  
H. V. Kamath ◽  
Sheshgiri N. Kulkarni
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Ionization Mass

Electron impact and chemical ionization mass spectra of some unsaturated anomericC-glycosides

1991 ◽  
Vol 26 (2) ◽  
pp. 85-88 ◽  
Author(s):  
Mohamed Brakta ◽  
Paul Lhoste ◽  
Denis Sinou ◽  
Joseph Banoub
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Ionization Mass

Electron impact and chemical ionization mass spectra of norbornane/ene di-exo and di-endo-fused 1,3-oxazin-2(1H)-ones and 1,3-oxazine-2(1H)-thiones

1990 ◽  
Vol 25 (11) ◽  
pp. 615-619 ◽  
Author(s):  
Tuula Partanen ◽  
Pirjo Vainiotalo ◽  
Géza Stájer ◽  
Gábor Bernáth ◽  
Kalevi Pihlaja
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Ionization Mass
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