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    Author(s): Jack G. Calvert
    Date: 1976
    Source: In: Dochinger, L. S.; Seliga, T. A., eds. Proceedings of the first international symposium on acid precipitation and the forest ecosystem; Gen. Tech. Rep. NE-23. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. p.55
    Publication Series: General Technical Report (GTR)
    Station: Northeastern Research Station
    PDF: View PDF  (31.19 KB)

    Description

    The mechanisms and rates of conversion of sulfur dioxide to sulfur trioxide, sulfuric acid, and other "sulfate" aerosol precursors are considered in view of current knowledge related to atmospheric reactions and chemical kinetics. Several heterogeneous pathways exist for SO2 oxidation promoted on solid catalyst particles and in aqueous aerosol solutions in ambient air. The rates of these processes are of questionable significance in SO2-containing gases which are well removed from pollutant sources and highly diluted through turbulent diffusion and transport mechanisms. Computer simulations of the rates of SO2 removal reactions show that several homogeneous pathways for SO2 conversion to acid precursor are expected to be important in atmospheres containing even low levels of NO, NO2, and oxidizable organic matter. Mechanistic considerations allow some reasonable speculation about the nature of the initial products of the SO2 reactions which lead ultimately to acids and various sulfate salts.

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    Citation

    Calvert, Jack G. 1976. An evaluation of possible mechanisms for conversion of sulfur dioxide to sulfuric acid and sulfate aerosols in the troposphere. In: Dochinger, L. S.; Seliga, T. A., eds. Proceedings of the first international symposium on acid precipitation and the forest ecosystem; Gen. Tech. Rep. NE-23. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. p.55

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