A Passive Sampler for Determination of Nitrogen Dioxide in Ambient Air

Lianzhi Lin , Dan Xiao 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
J. Chem. Educ., 2005, 82 (8), p 1231
DOI: 10.1021/ed082p1231
Publication Date (Web): August 1, 2005

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.

Keywords (Audience):

First-Year Undergraduate / General

Keywords (Domain):

Environmental Chemistry

Keywords (Feature):

Cost-Effective Teacher

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Calibration
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  • Received: August 03, 2009

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