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DOI: 10.1039/A902937K (Paper) Reference Section for: J. Environ. Monit., 1999, 1, 349-352

Validation of a diffusive sampler for NO2

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Annika Hagenbjörk-Gustafsson, Roger Lindahl, Jan-Olof Levin and Doris Karlsson

Abstract

A diffusive sampler for NO2, Willems badge, was validated in laboratory experiments and field tests. The collecting reagent for NO2 in the sampler is triethanolamine, and the analysis is based on a modified colorimetric method, the Saltzman method. The analysis was performed by a flow injection analysis (FIA) technique. The sampling rate for the sampler was determined to be 40.0 ml min–1. There was no effect of NO2 concentration or relative humidity on sampling rate, and the influence of sampling time was found to be small. The detection limit was 4 µg m–3 for a 24 h sample. The capacity is high enough to allow sampling of 150 µg m–3 for 7 days, which is twice the recommended Swedish short-term (24 h) guideline value as a 98-percentile over 6 months. In field tests, the sampler performed well, even at wind speeds higher than 2 m s–1, and at low temperatures. The overall uncertainty of the method was 24%. The sensitivity and capacity of the method also make it suitable for personal sampling for 2-8 h in working environments.

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