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  Home > JCE Print > Journal of Chemical Education > Issues > 2005  > August  >
In the Laboratory
Cost-Effective Teacher
A Passive Sampler for Determination of Nitrogen Dioxide in Ambient Air
Dan Xiao, Lianzhi Lin, and Hongyan Yuan
College of Chemical Engineering, Sichuan University, Chengdu 610065, China

Martin M. F. Choi and Winghong Chan
ChemEdu Limited and Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China

Cover
August 2005
Vol. 82 No. 8
p. 1231
Abstract
This article describes the use of a passive sampler for detecting and collecting nitrogen dioxide, NO2, in ambient air. This device is based on microporous PTFE membranes that allow air samples to diffuse through and subsequently react with an absorbing reagent solution. The absorbance value of this reagent is proportional to the NO2 concentration in ambient air. It has been successfully applied to determine the NO2 concentrations in various sampling sites. The sampler is simple, lightweight, and inexpensive. The experiments are suitable for college students in analytical chemistry and environmental studies.
More Information
*  Citation
 Xiao, Dan; Lin, Lianzhi; Yuan, Hongyan; Choi, Martin M. F.; Chan, Winghong. J. Chem. Educ. 2005 82 1231.
*  Keywords
 Amines / Ammonium Compounds; Analytical Chemistry; Calibration; Coordination Compounds; Environmental Chemistry; First-Year Undergraduate / General; Gases; Hands-On Learning / Manipulatives; High School / Introductory Chemistry; Laboratory Equipment / Apparatus; Laboratory Instruction; Membranes; Nonmajor Courses; Public Understanding / Outreach; Quantitative Analysis; UV-Vis Spectroscopy
*  History
 Created:
Last Updated:		 July 5, 2005
July 8, 2005
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