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RECORD NUMBER: 2 OF 4

OLS Field Name OLS Field Data
Main Title Methods for simulating gas phase SO2 oxidation in atmospheric models /
Author Meagher, J. F. ; Olszyna, K. J.
Other Authors
Author Title of a Work
Olszyna, Kenneth J.
CORP Author Tennessee Valley Authority, Muscle Shoals, AL.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Publisher GPO,
Year Published 1985
Report Number EPA/600/3-85/012
Stock Number PB85-173110
Subjects Sulfur dioxide--Environmental aspects. ; Air--Pollution--Simulation methods. ; Sulphur dioxide--Environmental aspects
Additional Subjects Sulfur dioxide ; Mathematical models ; Oxidation ; Air pollution ; Reaction kinetics ; Test chambers ; Nitrogen oxides ; Sulfur dioxide ; Electric power plants ; Propylene ; Water vapor ; Coal fired power plants ; Chemical reaction mechanisms ; Butane
Holdings
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Status
NTIS  PB85-173110 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
Collation 86 pages : illustrations
Abstract
Two different approaches are presented for simulating gas phase sulfur dioxide oxidation in atmospheric models. The first approach was to develop an empirical relationship based on rate data collected at four coal-fired power plants during 11 separate studies. Cosine functions were used to simulate annual and diurnal variations in the oxidation rate constant. The second approach was to develop a kinetic model based on data obtained from smog chamber experiments using mixtures of sulfur dioxide, propene, butane, nitrogen oxides, and water vapor. Sulfur dioxide oxidation in the gas phase was found to occur by two mechanisms. At low HC/NOx values hydroxyl radical addition to sulfur dioxide predominates. At high HC/NOx values, oxidation via reaction with products of the ozone-olefin reaction dominates. The chamber data suggest that the HO-SO2 reaction leads mainly to the production of hydroperoxyl radical and sulfuric acid. A previously proposed mechanism for the reaction of sulfur dioxide with Criegee intermediates was found to provide an excellent fit to the data at the high HC/NOx values.
Notes
Caption title. "February 1985." "EPA/600/3-85/012." "Final report March 1983-July 1884." "Contract/Grant No. IAG No. AD-64-F2-A180." "Program Element No. CDTA1D/02, Task 227 8 FY-85." Microfiche.