Ion trajectory simulations of a conical octopole ion guide and its comparison with a parallel one in chemical ionization mass spectrometric applications

2018 ◽  
Vol 32 (12) ◽  
pp. 965-972
Author(s):  
Qiduo Shao ◽  
Jun Zhao
Keyword(s):  
Chemical Ionization ◽  
Mass Spectrometric ◽  
Ionization Mass ◽  
Ion Trajectory ◽  
Ion Guide ◽  
Trajectory Simulations

Comparison of Gas Chromatographic/Mass Spectrometric and Liquid Chromatographic/Mass Spectrometric Methods for Confirmation of Coumaphos and Its Oxygen Analog in Eggs and Milk

1983 ◽  
Vol 66 (6) ◽  
pp. 1358-1364
Author(s):  
Kevin D White ◽  
Zhao Min ◽  
William C Brumley ◽  
Richard T Krause ◽  
James A Sphon
Keyword(s):  
Mass Spectra ◽  
Chemical Ionization ◽  
Negative Ions ◽  
Mass Spectrometric ◽  
Ionization Mass ◽  
Organophosphate Insecticide ◽  
Ion Detection ◽  
Oxygen Analog ◽  
Liquid Chromatographic ◽  
Chromatographic Mass

Abstract A comparison of a liquid chromatographic (LC)/mass spectrometric (MS) procedure for confirming coumaphos, an organophosphate insecticide, and its oxygen analog in milk and eggs with a capillary gas chromatographic (GO/MS method is presented. For the confirmation of coumaphos and its oxygen analog, multiple ion detection of both positive and negative ions from the chemical ionization mass spectra was used. Samples of milk and eggs fortified with the 2 compounds at the 0.1,0.01, and 0.005 ppm levels were analyzed. The major finding is the relatively greater efficiency of the LC/MS interface compared with the GC/MS capillary injector.

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