Summary
Automated denuder systems have been developed for the measurement of air concentrations of NH3, HNO3 and NH4NO3. The response time is in the order of one hour based on a sampling time of about 20 minutes. The limit of detection for NH3, HNO3 and NH4NO3 is 0.1 µg.m-3. During a field intercomparison at Rome on 19–23 September 1988 for the measurement of HNO3 and nitrate-containing aerosol in ambient air, it was demonstrated that these novel techniques show good agreement with conventional techniques. Advantages, such as automation and the relatively short sampling time are demonstrated by the observed strong diurnal fluctuation of the HNO3 concentration. As the reproducibility is better than 5%, these denuder systems can be used for dry deposition flux measurements by the gradient method. This will be tested during a field experiment from July 1989 to May 1990 in The Netherlands for the NH3 flux over a forest by two thermodenuders at 30 and 20 m height.
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References
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© 1990 ECSC, EEC, EAEC, Brussels and Luxembourg
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Keuken, M.P., Wayers-IJpelaan, A., Otjes, R.P., Slanina, J. (1990). Determination of NH3, HNO3 and NH4NO3 in Ambient Air by Automated Thermodenuder Systems and a Wet Annular Denuder System. In: Restelli, G., Angeletti, G. (eds) Physico-Chemical Behaviour of Atmospheric Pollutants. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0567-2_1
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DOI: https://doi.org/10.1007/978-94-009-0567-2_1
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