| 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
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB90-104506 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
16p |
| Abstract |
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.) |
