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Simultaneously Sampling of NH3, HNO3, HNO2, HCl. SO2 And H2O2 in Ambient Air by A Wet Annular Denuder System

  • M. P. Keuken
  • R. P. Otjes
  • J. Slanina

Summary

The automated wet denuder developed at ECN, is based on air sampling by an aqueous solution present in the annulus of a rotating annular denuder. After a sampling time of 35 minutes at a flow rate of 30 1.min-1, automatically the absorption solution is pumped into a sample tube and the denuder is recoated. The obtained solutions are analyzed off-line. The limits of detection for NH3, HNO3, HNO2, HCl and SO2 are 0.1 µg.m-3, and for H2O2 0.01 µg.m-3. During an intercomparison experiment for the measurement of HNO3 and nitrate-containing aerosols in ambient air at Rome from 19 to 23 September 1988, ECN participated with a parallel wet annular denuder system. Advantages of the wet annular denuder are demonstrated by the detection of a strong diurnal variations of HNO3 and NH3 concentrations at Rome. The reproducibility better than 5 % between the parallel denuders for NH3 and HNO3 show the potential use of wet denuders for gradient measurements. Results of experiments in The Netherlands for the simultaneously measurement of NH3, HNO3, HNO2, HC1, SO2 and H2O2 over a year demonstrate the application of the wet denuder as a field instrument.

Keywords

Sample Inlet Gradient Measurement ROIATING PARI Annular Denuder Strong Diurnal Variation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. (1).
    Keuken M.P. (1989) Determination of acid-deposition-related compounds in the lower atmosphere. ECN-218.Google Scholar
  2. (2).
    Keuken M.P., Schoonebeek C.A.M., van Wensveen-Louter A. and Slanina J. (1988) Simultaneous sampling of NH3, HN03, HCl, S02 and H202 in ambient air by a wet annular denuder system. Atmos. Environ. 22, 2541 – 2548.CrossRefGoogle Scholar
  3. (3).
    Buisman E., Maas H.F.M. and Asman W.A.H. (1987) Anthropogenic NH3 emissions in Europe. Atmos. Environ. 21, 1009 – 1022.CrossRefGoogle Scholar

Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1990

Authors and Affiliations

  • M. P. Keuken
    • 1
  • R. P. Otjes
    • 1
  • J. Slanina
    • 1
  1. 1.Netherlands Energy Research Foundation (ECN)PettenThe Netherlands

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