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Illustration of Deviations in the Beer-Lambert Law in an Instrumental Analysis Laboratory: Measuring Atmospheric Pollutants by Differential Optical Absorption Spectrometry

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Heather C. Allen , Theo Brauers and Barbara J. Finlayson-Pitts

University of California, Irvine, Department of Chemistry, Irvine, CA 92717-2025

J. Chem. Educ., 1997, 74 (12), p 1459

DOI: 10.1021/ed074p1459

Publication Date (Web): December 1, 1997

Section:

History, Education, and Documentation

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.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Environmental Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Instrumental Methods

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