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Main Title Temperature Dependence of Mass Accommodation of SO2 and H2O2 on Aqueous Surfaces.
Author Worsnop, D. R. ; Zahniser, M. S. ; Kolb, C. E. ; Gardner, J. A. ; Watson, L. R. ;
CORP Author Aerodyne Research, Inc., Billerica, MA. ;Boston Coll., Chestnut Hill, MA. Dept. of Chemistry.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/077;
Stock Number PB90-104506
Additional Subjects Hydrogen peroxide ; Sulfur dioxide ; Temperature coefficient ; Water pollution ; Air water interactions ; Mass transfer ; Surface properties ; Air pollution ; Clouds(Meteorology) ; Drops(Liquids) ; Experimental design ; Gas flow ; Reprints ; Acid rain ; Tracer studies ; Heterogeneous reactions
Library Call Number Additional Info Location Last
NTIS  PB90-104506 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 16p
The mass accommodation coefficients of SO2 and H2O2 on aqueous surfaces over the temperature range 260-292 K are reported. The experimental method used combined a monodisperse train of droplets and a low pressure flow reactor. Uptake rates were determined by measuring changes in trace gas number density as a function of exposed liquid surface area. Results for SO2 showed an accommodation coefficient of 0.11 + or - 0.02 with no significant temperature variation. H2O2 showed a strong temperature dependence with an accommodation coefficient of 0.18 + or - 0.02. On a practical level the mass accommodation process can be the rate-limiting step in heterogeneous mass transfer in clouds or above oceans. SO2 and H2O2 are of interest because of their role in acid rain formation. Modeling studies indicate aqueous oxidation of SO2 to SO4(2-) occurs in cloud droplets, with H2O2 implicated as the primary oxidant. Knowledge of gas/liquid mass-transfer rates for these species is critical to modeling of the heterogeneous cloud process. (Copyright (c) 1989 American Chemical Society.)