Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Investigation of Hydroxyl Radical Reactions with o-Xylene and m-Xylene in a Continuous Stirred Tank Reactor (Journal Version).
Author Grey, M. W. ; Fox, D. L. ; Kamens, R. M. ; Stockburger, L. ;
CORP Author North Carolina Univ. at Chapel Hill. Dept. of Environmental Sciences and Engineering. ;Systems Applications, Inc., San Rafael, CA.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Publisher c1987
Year Published 1987
Report Number EPA/600/J-87/444;
Stock Number PB89-110423
Additional Subjects Xylenes ; Air pollution ; Hydroxyl radicals ; Photochemical reactions ; Smog ; Aromatic monocyclic hydrocarbons ; Reaction kinetics ; Phenols ; Formaldehyde ; Nitro compounds ; Gases ; Ultraviolet radiation ; Nitrous acid ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB89-110423 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 03/14/1989
Collation 13p
The gas phase reactions of hydroxyl radicals with o-Xylene and m-Xylene were studied in a continuous stirred tank reactor. Gas and aerosol products accounted for 65 to 85 percent of the reacted carbon. Approximately 19 and 10 percent of the original o-Xylene and m-Xylene oxidation occurred through methyl hydrogen abstraction by OH, primarily leading to methylbenzyl nitrates and tolualdehydes. The remaining mass reacted through the OH addition pathway forming dimethylphenols, nitro-dimethylphenols, nitroxylenes and stable products resulting from further reaction of metastable 02-OH-adducts (including alpha-dicarbonyls, methyl-p-benzoquinones, CO and formaldehyde). For o-Xylene the ratio of reaction rate constants for formation of nitroxylenes versus dimethylphenols was estimated to be 59,000, while the same value for m-xylene was only about 10,000. The ratios of the dimethylphenol formation rates to the effective oxygen addition rates were found to be greater than or equal to 0.15 for o-Xylene and 0.27 for m-Xylene. These vary significantly from the approximations used in current photochemical kinetics models.