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| Titel |
First atmospheric observations of three chlorofluorocarbons |
| VerfasserIn |
J. C. Laube, A. Engel |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 17 ; Nr. 8, no. 17 (2008-09-02), S.5143-5149 |
| Datensatznummer |
250006356
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| Publikation (Nr.) |
 copernicus.org/acp-8-5143-2008.pdf |
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| Zusammenfassung |
| We report the first atmospheric observations of the Chlorofluorocarbons
(CFCs) trifluorochloroethene, 3-chloropentafluoropropene and
4,4-dichlorohexafluoro-1-butene by means of Gas Chromatography with Electron
Capture and Mass Spectrometric detection (GC-ECD-MS) in air samples taken at
the Taunus Observatory operated by the University of Frankfurt (Main) and
the Jungfraujoch High Altitude Research Station in Switzerland. These
substances belong to a class of CFCs containing a double bond and are
suspected to originate from the production and thermal degradation of widely
used fluoropolymers like polychlorotrifluoroethene (PCTFE). Their
atmospheric lifetimes are expected to be rather short. A quantitative
calibration could only be derived for trifluorochloroethene but not for the
other species by now. Thus, we use a relative sensitivity method to get a
first indication of the observed atmospheric abundances. Identification was
possible because of an air plume containing high concentrations of these
substances. We suggest that the abundances found on this occasion originated
from a local source. However, we have also observed the novel CFCs in air
masses representative of background conditions, though with much lower
concentrations. These species and some of their degradation products are
toxic and could also be relevant for stratospheric and tropospheric ozone
depletion. |
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