A New Analyzer for Sulfuric Acid and Sulfur Aerosols in Ambient Air: Development And Measurements

  • R. Böhm
  • G. W. Israël

Summary

A semi-continuous analyzer has been developed for simultaneous monitoring of ambient sulfuric acid and sulfur aerosols. Sulfur aerosol concentration is measured directly with a flame photometric detector. Sulfuric acid is first adsorbed and accumulated in a heated diffusion denuder. Subsequently it is released by increasing the temperature to 700°C and analyzed by the same detector. With a time resolution of 30 min. the detection limit of the analyzer amounts to 0.1 µg m-3 for sulfuric acid and 1.0 µg m-3 for sulfur aerosols (calculated as S04 2-). The automated and computer controlled analyzer was applied to a clean and highly polluted air region (Edelmannshof; Berlin West)) and a smog chamber. Sulfuric acid was detected only in winter, where it reached up to 2.7 µg m-3 at Edelmannshof and up to 0.74 µg m-3 in Berlin (West). Corresponding S02 concentrations were much lower at Edelmannshof. In summer the ratio of S04 2-/S02 was found to be 10 times higher at Edelmannshof than in Berlin (West). The photochemical experiments, which were carried out with α-pinene, S02, NOx, 03, H20 and light in Teflon bags, showed good reproducibility. The relative humidity influenced greatly the composition of the formed sulfur aerosols. More than 90% of these aerosols were identified as S04 2- using ion chromatographic analysis. Up to 50% of the converted S02 were recovered as suspended aerosols in the bag.

Keywords

Measurement Campaign Sulfur Aerosol Simultaneous Monitoring Teflon Film Smog Chamber 
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. Israël G.W., Heits B., Wengenroth K. and Bauer H.-W., 1983: Staubbelastung und Staubeigenschaften während Smogsituationen, Bericht des Fachgebiets Luftreinhaltung, TU Berlin, 95 – 97Google Scholar
  2. Israël G.W. and Böhm R., 1987: Verbesserung und Prüfung der Anwendbarkeit eines Meßverfahrens zur quasikontinuierlichen Messung von Schwefelsäure und Gesamtsulfat in Reinluftgebieten, Forschungsbericht KfK 30, Kernforschungszentrum KarlsruheGoogle Scholar
  3. McMurry P.H. and Grosjean D., 1985: Gas and Aerosol Wall Losses in Teflon Film Chambers, Environ. Sci. Technol., 19, 1176 – 1182CrossRefGoogle Scholar
  4. Niessner R. and Klockow D., 1980: A Thermoanalytical Approach to Speciation of Atmospheric Strong Acids, Intern. J. Environ. Anal. Chem., 8, 163 – 175CrossRefGoogle Scholar
  5. Nolting F., Behnke W. and Zetzsch C., 1988: A smog chamber for studies of the reactions of terpenes and alkenes with ozone and OH, J. Atmos. Chem., 6, 47 – 59CrossRefGoogle Scholar
  6. Ströhlein Instruments, 1986: Diffusionsabscheiderprobenahmesystem für die Erfassung starker Säuren im atmosphärischen Aerosol, Ströhlein Instruments GmbH&Co, D-4044 Kaarst 1Google Scholar

Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1990

Authors and Affiliations

  • R. Böhm
    • 1
  • G. W. Israël
    • 1
  1. 1.Fachgebiet LuftreinhaltungTechnische Universität BerlinBerlinGermany

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