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Related Experiment Videos

Validation of a diffusive sampler for NO2.

A Hagenbjörk-Gustafsson1, R Lindahl, J O Levin

  • 1National Institute for Working Life, Department of Chemistry, P.O. Box 7654, S-907 13 Umeå, Sweden.

Journal of Environmental Monitoring : JEM
|September 1, 2001
PubMed
Summary
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The Willems badge effectively measures nitrogen dioxide (NO2) using a validated colorimetric method. This diffusive sampler demonstrates high capacity and accuracy, suitable for both environmental and personal NO2 monitoring.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Occupational Health

Background:

  • Nitrogen dioxide (NO2) is a significant air pollutant with adverse health effects.
  • Accurate and reliable NO2 monitoring is crucial for environmental and occupational health assessments.
  • Existing NO2 sampling methods may have limitations in terms of capacity, sensitivity, or ease of use.

Purpose of the Study:

  • To validate the performance of the Willems badge, a diffusive sampler for NO2.
  • To assess the sampler's reliability in laboratory and field conditions.
  • To determine the suitability of the Willems badge for various NO2 monitoring applications.

Main Methods:

  • Validation of the Willems badge using laboratory experiments and field tests.

Related Experiment Videos

  • Utilizing triethanolamine as the collecting reagent for NO2.
  • Analysis based on a modified Saltzman colorimetric method with flow injection analysis (FIA).

    • Main Results:

    • The sampling rate was determined to be 40.0 ml min-1, unaffected by NO2 concentration or relative humidity.
    • A low detection limit of 4 µg m-3 for a 24 h sample was achieved.
    • The sampler exhibited high capacity, allowing for 7-day sampling of 150 µg m-3, and performed well in field tests under various conditions (wind, low temperature).
    • Overall method uncertainty was determined to be 24%.

    Conclusions:

    • The Willems badge is a validated and reliable diffusive sampler for NO2.
    • Its high sensitivity, capacity, and performance in diverse conditions make it suitable for environmental monitoring.
    • The sampler is also effective for personal NO2 monitoring in occupational settings for 2-8 hour periods.