Record Display for the EPA National Library Catalog
RECORD NUMBER: 18 OF 166| Main Title | Atmospheric chemistry and physical fate of HCFCs and HFCs and their degradation products {MICROFICHE} / | |||||||||||
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| Author | Edney, E.O. | |||||||||||
| CORP Author | Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. | |||||||||||
| Publisher | U.S. Environmental Protection Agency, Atmospheric Research and Exposure Assessment Laboratory, | |||||||||||
| Year Published | 1992 | |||||||||||
| Report Number | EPA/600/R-92/222 | |||||||||||
| Stock Number | PB93-131449 | |||||||||||
| Subjects | Haloethers--Biodegradation | |||||||||||
| Additional Subjects | Atmospheric chemistry ; Physical properties ; Environmental chemical substitutes ; Air pollution abatement ; Experimental design ; Freons ; Oxidation ; Hydrolysis ; Deposition ; Precipitation(Meteorology) ; Halogen organic compounds ; Reaction kinetics ; Photochemical reactions ; Mathematical models ; Evaporation ; Air water interactions ; Oceans ; Hydrochlorofluorocarbons ; Hydrofluorocarbons | |||||||||||
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| Collation | 38 p. ; 30 cm. | |||||||||||
| Abstract | Laboratory experiments were conducted to determine the fate of the proposed CFC substitutes HCFC-22, HCFC- 123, HCFC-124, HCFC-141b, HCFC-142b, HFC-125, HFC-134a, and HFC-152a. The program consisted of photochemical oxidation experiments to identify stable oxidation products and measure their yields; deposition studies to measure the extent oxidation products are absorbed into aqueous media; and experiments to determine the fate of hydrolysis products during droplet evaporation. Model results, obtained using laboratory derived lower limits estimates for aqueous deposition velocities and assuming a well mixed atmosphere, suggest the uptakes rates to cloudwater and oceans are sufficiently fast such that significant buildup of gas phase products is unlikely. The laboratory studies suggest that product accumulation in aqueous media could be affected by losses during evaporation. Direct loss by evaporation of halogenated acids and/or production of volatile compounds after further reactions of the dissolved acids could return halogenated compounds to the atmosphere. |
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| Notes | "EPA/600/R-92/222." "December 1992." |