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  Home > JCE Print > Journal of Chemical Education > Issues > 2006  > August  >
In the Laboratory
Identification of Glue Vapors Using Electron Impact and Chemical Ionization Modes in GC–MS
Jeremy Richer, John Spencer, and Michael Baird
Department of Chemistry, Wheeling Jesuit University, Wheeling, WV 26003
Cover
August 2006
Vol. 83 No. 8
p. 1196
Abstract
The analysis of the vapors from six commercial glues provided an interesting and challenging lab assignment for students in an instrumental analysis laboratory course. Students used both electron impact (EI) and chemical ionization (CI) modes of operation in GC–MS to identify the volatile components in their assigned glue. Chemical ionization using methane as the reagent gas provided a complementary analysis to the more common EI mode of operation. In the softer CI mode, there is a higher probability of observing the molecular ion. Students were required to explain the observation of specific mass fragments observed from both EI and CI operations in terms of their reactions in the ion source of the mass spectrometer. This interpretation of mass spectra provided the students an educational exercise for understanding the ionization processes that occur in mass spectroscopy.
Supplement
Instructions for the students, notes for the instructor, and data from the experiment are available.
*  Contents JCE2006p1196W.doc (Microsoft Word)
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*  Citation
 Richer, Jeremy; Spencer, John; Baird, Michael J. Chem. Educ. 2006 83 1196.
*  Keywords
 Analytical Chemistry; Consumer Chemistry; Environmental Chemistry; Gas Chromatography; Gases; Hands-On Learning / Manipulatives; Instrumental Methods; Laboratory Instruction; Mass Spectrometry; Upper-Division Undergraduate
*  History
 Created:
Last Updated:		 6/21/2006
6/30/2006
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