Record Display for the EPA National Library Catalog


Main Title Atmospheric Acidification Chemistry: A Review.
Author Durham, J. L. ; Demerjian, K. L. ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, NC.
Year Published 1984
Report Number EPA-600/D-84-188;
Stock Number PB84-215490
Additional Subjects Acidification ; Oxidation ; Air pollution ; Reviews ; Nitric acid ; Sulfuric acid ; Reaction kinetics ; Oxidizers ; Hydrogen peroxide ; Ozone ; Nitrogen dioxide ; Atmospheric chemistry ; Hydroxyl radical ; Acid rain ; Chemical reaction mechanisms ; Free radicals ; Path of pollutants
Library Call Number Additional Info Location Last
NTIS  PB84-215490 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 22p
Atmospheric acidification is the result of the oxidation of sulfur, nitrogen, and organic compounds to form their corresponding acids. The gas and aqueous-phase pathways depend on the production of oxidizing free radicals (HO, CH3O2) that react directly with these compounds or produce molecular oxidants. The most important molecular oxidants are H2O2, organic peroxides, and O3. Except for O3-olefin reactions, these molecular oxidants are not reactive in the gas phase, but they are highly reactive in the aqueous phase with dissolved reductants (SO2, HNO2, organics). Thus, the molecular oxidants may be generated in a photochemically active region and transported long distances before reacting with dissolved reductants in the aqueous phase, such as fogs, clouds, and rain. Changes in H2SO4 and HNO3 atmospheric production rates are expected to be a function of changes in the emission rates of SO2, NOx, and VOC. A reduction in emission rate of SO2 will lead to a reduction in gas-phase production of H2SO4. However, if SO2 concentration exceeds that of H2O2 reduction in SO2 emissions may not lead to a reduction in aqueous-phase production of H2SO4. Effective control of H2O2 production is dependent on scientific advances to determine its formation mechanisms and rates.