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Validation of a diffusive sampler for NO2
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Occupational and Environmental Medicine.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
1999 (English)In: Journal of Environmental Monitoring, ISSN 1464-0325, E-ISSN 1464-0333, Vol. 1, 349-352 p.Article in journal (Refereed) Published
Abstract [en]

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 mg m−3 for a 24 h

sample. The capacity is high enough to allow sampling of 150 mg 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 performedwell, 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.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 1999. Vol. 1, 349-352 p.
Keyword [en]
diffusive sampler, NO2, validation
National Category
Environmental Health and Occupational Health Chemical Sciences
Research subject
Analytical Chemistry
URN: urn:nbn:se:umu:diva-95729DOI: 10.1039/A902937KISI: 000083696300017OAI: diva2:760909
AIRMON, 1999, Geilo, Norway
Available from: 2014-11-05 Created: 2014-11-04 Last updated: 2014-11-07Bibliographically approved
In thesis
1. Validation of diffusive samplers for nitrogen oxides and applications in various environments
Open this publication in new window or tab >>Validation of diffusive samplers for nitrogen oxides and applications in various environments
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The overall aim of this thesis was to validate diffusive samplers for measurements of nitrogen dioxide (NO2) and nitrogen oxides (NOx). The Willems badge was validated for NO2 measurements both in laboratory tests and in field tests (Paper I-II). The sampling rate was 40.0 mL/min for ambient air concentrations and 46.0 mL/min for higher concentrations. No effects of different factors on sampling rate were found except for a reduced sampling rate at low wind velocity. The results of the laboratory validation were confirmed in field tests in ambient air and with personal sampling. The correlation between diffusive samplers and the reference monitor was good for ambient measurements. In conclusion, the Willems badge performs well at wind velocities down to 0.3 m/s, and this makes it suitable for personal sampling but less suitable for measurements in indoor air where the wind velocity is lower. Paper III reports about the field validation of the Ogawa diffusive samplers. Absolute humidity and temperature were found to have the strongest effect on sampling rate with lower uptake rates at low absolute humidity or temperature. The sampling rates above 0 °C were 8.6 mL/min for NO2 and 9.9 mL/min for NOx. NO2 and NOx concentrations that were determined using the manufacturer’s protocol were either underestimated or overestimated. The agreement between concentrations measured by the Ogawa sampler and the reference monitor was improved when field-determined sampling rates were used to calculate concentrations. Paper IV is based on a study with the aim of assessing the exposure of the Swedish general population to NO2 and some carcinogenic substances. The surveys were performed in one of five Swedish cities every year. In each survey, personal measurements of NO2 and some carcinogenic substances were conducted on 40 randomly selected individuals. In the study presented in this thesis, the NO2 part of the study is in focus and results were available for eight surveys conducted across the five cities. The estimated arithmetic mean concentration for the general Swedish population was 14.1 μg/m3. The exposure level for NO2 was higher for smokers compared with non-smokers, and the NO2 exposure levels were higher for people who had gas stoves at home or who were exposed at their workplace. The exposure was lower for those who had oil heating in their houses.

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2014. 67 p.
Umeå University medical dissertations, ISSN 0346-6612 ; 1685
Nitrogen dioxide, NOx, diffusive sampling, validation, vehicle exhaust, exposure measurement
National Category
Environmental Health and Occupational Health
urn:nbn:se:umu:diva-95757 (URN)978-91-7601-144-7 (ISBN)
Public defence
2014-11-28, Hörsal B Unod T 9, Norrlands universitetssjukhus, Umeå, 09:00 (Swedish)
Available from: 2014-11-07 Created: 2014-11-05 Last updated: 2014-11-10Bibliographically approved

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Hagenbjörk-Gustafsson, AnnikaLindahl, RogerLevin, Jan-Olof
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