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The photochemical conversion of SO2 to sulfuric acid and particulate sulfur in the presence of biogenic hydrocarbon traces

: Nolting, F.; Zetzsch, C.

Journal of Aerosol Science 20 (1989), Nr.8, S.1067-1070
ISSN: 0021-8502
Fraunhofer ITA ( ITEM) ()
aerosol; hydrocarbon; photochemical conversion; photochemical degradation; photochemistry; photodegradation; SO3; sulfur compound; sulfur dioxide; sulfuric acid

The photooxidation processes of SO2 and the biogenic hydrocarbon alpha-pinene can be studied in the presence of a synthetic photosmog in bags made from teflon. A major portion of the SO2 is converted to H2SO4 and sulfur particles by, probably, heterogeneous reactions. The yield of these products is dependent on the presence of humidity. Under dry condition, the main product is H2SO4 and third of the consumed SO2 is recovered in the airborne aerosols. In the presence of 60% relative humidity sulfurous particles are the almost exclusive product with a yield of 50%. The nature of the sulfur aerosols is yet unknown. From ion chromatography the formation of sulfate is supported. The formation of organic sulfurous compounds could not be detected.