Registration Dossier
Registration Dossier
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EC number: 212-377-0 | CAS number: 811-97-2
Mode of degradation in actual use
Administrative data
- Endpoint:
- mode of degradation in actual use
- Adequacy of study:
- supporting study
Data source
Referenceopen allclose all
- Reference Type:
- publication
- Title:
- Radiative forcing of climate change. The 1994 report of the Scientific Assessment Group. Summary for Policy Makers.
- Author:
- Intergovernmental Panel on Climate Change
- Year:
- 1 995
- Bibliographic source:
- IPCC, Hadley Centre, Meteorological Office, Bracknell, UK p28.
- Reference Type:
- publication
- Title:
- Climate Change 2001: The scientific basis. Contribution of Working Group I to the 3rd assessment report of the IPCC
- Author:
- Intergovernmental Panel on Climate Change
- Year:
- 2 001
- Bibliographic source:
- Cambridge University Press, Cambridge, UK.
- Reference Type:
- publication
- Title:
- Global ozone research and monitoring project, scientific assessment of stratospheric ozone. Report 44.
- Author:
- WMO
- Year:
- 1 998
- Bibliographic source:
- World Meteorological Associated, Geneva, Switzerland
- Reference Type:
- publication
- Title:
- Source gases. Global ozone research and monitoring project, scientific assessment of stratospheric ozone. Report 47.
- Author:
- WMO
- Year:
- 2 002
- Bibliographic source:
- World Meteorological Association, Geneva, Switzerland, pp1.54, 1.57
- Reference Type:
- publication
- Title:
- The atmospheric degradation and impact of 1,1,1,2-tetrafluoroethane (hydrofluorocarbon 134a)
- Author:
- Franklin J
- Year:
- 1 993
- Bibliographic source:
- Chemosphere 27: 1565-1601
Materials and methods
Test material
- Reference substance name:
- Norflurane
- EC Number:
- 212-377-0
- EC Name:
- Norflurane
- Cas Number:
- 811-97-2
- Molecular formula:
- C2H2F4
- IUPAC Name:
- 1,1,1,2-tetrafluoroethane
Constituent 1
Results and discussion
Applicant's summary and conclusion
- Executive summary:
The atmospheric degradation of HFC-134a occurs mainly in the troposphere, initiated by reaction with naturally occurring hydroxyl radicals (photo-oxidation), and in the stratosphere through photolysis and reaction with O(1D) and OH. Both tropospheric and stratospheric degradation processes were taken into account to calculate an overall atmospheric lifetime of 14 years (IPCC, 1994), corresponding to a half-life of 9.7 years. More recent estimations remained very close to this value, i.e. 13.6 years (WMO, 1998), 13.8 years (IPCC, 2001) or 14.0 years (WMO, 2002). The atmospheric lifetime of HFC-134a is much longer than either the intra- or inter-hemispheric mixing times. As a consequence, HFC-134a will become more or less uniformly distributed in the atmosphere on a global scale (Franklin, 1993). This conclusion is supported by atmospheric measurements.
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