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LABORATORY INVESTIGATIONS OF THE DEPOSITION OF OXIDATION OF HYDROCHLOROFLUOROCAROBNS (HCFCS) AND HYDROFLUOROCARBONS (HFCS) TO AQUEOUS SOLUTIONS
Citation:
Edney, E. AND D. Driscoll. LABORATORY INVESTIGATIONS OF THE DEPOSITION OF OXIDATION OF HYDROCHLOROFLUOROCAROBNS (HCFCS) AND HYDROFLUOROCARBONS (HFCS) TO AQUEOUS SOLUTIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-95/260, 1993.
Description:
Laboratory experiments were conducted to investigate the deposition to aqueous media of the gas phase oxidation products of the following hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs): CFC-22 (CClF2H), HFC-41, (CH3F), HCFC-123 (CCl2HCF3), HCFC-124 (CClFHCF3), HFC-125 (CF3CF2H), HFC-134a(CF3CFH2), HCFC-14lb(CCl2FCH3) HCFC-142b (CClF2CH3), and HFC-152a (CF2HCH3). ingle component experiments were conducted for he oxidation products CF3CFO,COF2,CF3C9O)Cl were exposed under laminar flow conditions to alkaline, acidic, and neutral solution in an aluminum exposure trough. he anionic composition of the exposure solutions were also conducted for irradiated mixture experiments were used to measure the effective deposition velocities of C(O)F2, C(o)FCl, HFC(O), CF(O)OOCF(O), CF3CCl(O), CF3CF(O). he deposition velocities differed by as much as a factor of two with the largest velocities found for C(O)F2 and CF3CF(O). he data was insufficient to determine the extent to which gas and liquid phase resistance controlled the overall deposition. owever, the data were used to estimated lower limits for the laboratory aqueous resistance and the results were found to be consistent with the recent conclusions of Wine and Chameides who reported the deposition of the oxidation products to ocean and cloudwater was sufficiently fast that there was little likelihood that the products would be transported to the stratosphere.