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  Home > JCE Print > Journal of Chemical Education > Issues > 1997  > December  >
In the Laboratory
Illustration of Deviations in the Beer-Lambert Law in an Instrumental Analysis Laboratory: Measuring Atmospheric Pollutants by Differential Optical Absorption Spectrometry
Heather C. Allen, Theo Brauers, and Barbara J. Finlayson-Pitts
University of California, Irvine, Department of Chemistry, Irvine, CA 92717-2025
Cover
December 1997
Vol. 74 No. 12
p. 1459
Abstract
With the new American Chemical Society approved option in environmental chemistry at the undergraduate level, there is a need for laboratory experiments illustrating fundamental concepts within a framework of environmental applications. We describe here a UV-visible spectroscopy experiment on gaseous NO2, which is appropriate for a junior-senior level instrumental analysis course. This experiment illustrates (1) the effects of spectral resolution as well as shifts in the 2 NO2 <-> N2O4 equilibrium on the Beer-Lambert law; and (2) the use of differential optical absorption spectrometry to measure NO2 and other trace gases and pollutants in the troposphere.
More Information
*  Citation
 Allen, Heather C.; Brauers, Theo; Finlayson-Pitts, Barbara J. J. Chem. Educ. 1997 74 1459.
*  Keywords
 Instrumental Methods, Environmental Chemistry, Equilibrium, UV-Vis Spectroscopy, Analytical Chemistry, and Laboratory Instruction
*  History
 Created:
Last Updated:		 July 20, 1999
June 23, 2005
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