February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 7, NUMBER 7, JULY 1994
PROFESSIONAL PUBLICATIONS... OF GENERAL INTEREST: CFC REPLACEMENTS
Environmental Impact of CFC Replacements--HFCs and HCFCs,"
T.J. Wallington (Ford Motor Co., Dearborn MI 48121-2053), W.F.
Schneider et al., Environ. Sci. & Technol., 28(7),
320A-325A, July 1994.
Presents a technical evaluation of the impact of HFCs and
HCFCs in terms of their ozone depletion potentials, global
warming potentials, and ability to form noxious degradation
products, by reviewing the atmospheric chemistry and gas- and
liquid-phase loss processes of their halocarbonyl decomposition
of Trifluoroacetate in Oxic and Anoxic Sediments," P.T.
Visscher (U.S. Geol. Survey, MS-465, 345 Middlefield Rd., Menlo
Pk. CA 94025), C.W. Culbertson, R.S. Oremland, Nature, 369(6483),
729-731, June 30, 1994.
Concern about trifluoroacetate (TFA), a breakdown product of
the CFC substitutes HFCs and HCFCs, has focused on its deposition
at the Earth's surface and possible increase to levels toxic to
plants and soil microbes. This study shows that TFA can be
rapidly degraded by microbes under anoxic and oxic conditions,
implying that significant microbial sinks exist in nature for the
elimination of TFA from the environment. (Although this study
concludes that TFA is not an environmental hazard, a sentence was
added to the end of the author's abstract by the journal editors
that mistakenly gives the opposite impression, according to Chem.
Eng. News, p. 7, July 4. The journal will print a correction
to the paper.)
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Index of Abbreviations