A New Analyzer for Sulfuric Acid and Sulfur Aerosols in Ambient Air: Development And Measurements
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.
KeywordsMeasurement Campaign Sulfur Aerosol Simultaneous Monitoring Teflon Film Smog Chamber
Unable to display preview. Download preview PDF.
- 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
- 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
- Ströhlein Instruments, 1986: Diffusionsabscheiderprobenahmesystem für die Erfassung starker Säuren im atmosphärischen Aerosol, Ströhlein Instruments GmbH&Co, D-4044 Kaarst 1Google Scholar