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RECORD NUMBER: 45 OF 176

OLS Field Name OLS Field Data
Main Title Effects of Solar Radiation on Manganese Oxide Reactions with Selected Organic Compounds.
Author Bertino, D. J. ; Zepp., R. G. ;
CORP Author Environmental Research Lab., Athens, GA.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-91/175;
Stock Number PB91-231431
Additional Subjects Photochemical reactions ; Manganese oxides ; Solar radiation ; Ultraviolet radiation ; Phenols ; Organic compounds ; Water pollution ; Degradation ; Reduction(Chemistry) ; Catalysis ; Electron transfer ; Reprints ; Dissolved organic matter
Holdings
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Status
NTIS  PB91-231431 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 11/26/1991
Collation 9p
Abstract
The effects of sunlight on aqueous redox reactions between manganese oxides (MnOx) and selected organic substances are reported. No sunlight-induced rate enhancement was observed for the MnOx oxidation of substituted phenols, anisole, o-dichlorobenzene, or p-chloroaniline. On the other hand, solar radiation did accelerate the reduction of manganese oxides by dissolved organic matter (DOM) from aquatic environments. The photoreduction of MnOx by DOM was little affected by molecular oxygen in air saturated water (250 microM), but was inhibited by 2,6-dichloroindophenol (0.5-6 microM), an excellent electron acceptor. MnOx reduction also was photosensitized by anthraquinone-2-sulfonate. These results indicate that the photoreduction probably involves electron transfer from excited states of sorbed DOM to the oxide surface. Wavelength studies indicated that ultraviolet-B radiation (280-320 nm) plays an important role in the photoreduction. (Copyright (c) 1991 by the American Chemical Society.)