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  Home > JCE Print > Journal of Chemical Education > Issues > 1999  > November  >
In the Laboratory
The Separation and Identification of Some Brominated and Chlorinated Compounds by GC/MS: An Advanced Undergraduate Laboratory
Rebecca M. O'Malley and Hsiao C. Lin
Chemistry Department, University of South Florida, Tampa, FL 33620-5250
Cover
November 1999
Vol. 76 No. 11
p. 1547
Abstract
An experiment has been developed for use in advanced undergraduate laboratories, in which a number of brominated and chlorinated compounds are separated and identified by GC/MS. All the compounds used in the experiment contain more than one bromine or chlorine atom. Both bromine and chlorine occur naturally as two isotopes, and this leads to the observation of some interesting ion patterns in the mass spectra. The students use the relative intensities of the peaks within the patterns to help identify the molecular ion and major fragment ions in each of the mass spectra. In most cases this information is adequate to identify the unknowns. In a few cases additional help is obtained from a mass spectral library. The experiment gives students practical experience with the GC/MS technique. Consideration of the identity of the ions that make up the mass spectral patterns gives the students an understanding of the effect of naturally occurring isotopes and insight into the processes involved in the forming of ions detected in a mass spectrometer.
More Information
*  Citation
 O'Malley, Rebecca M.; Lin, Hsiao C. J. Chem. Educ. 1999 76 1547.
*  Keywords
 Instrumental Methods; Laboratory Instruction; Chromatography; Mass Spectrometry; Isotopes
*  History
 Created:
Last Updated:		 October 12, 1999
June 23, 2005
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