Registration Dossier
Registration Dossier
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EC number: 200-839-4 | CAS number: 75-10-5
Additional information on environmental fate and behaviour
Administrative data
- Endpoint:
- additional information on environmental fate and behaviour
- Type of information:
- other: overview
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Several experimental studies, published in peer reviewed literature, notable limitations in design and/or reporting, but adequate for assessment
Data source
Referenceopen allclose all
- Reference Type:
- publication
- Title:
- Atmospheric chemical reactivity and ozone-forming potentials of potential CFC replacements
- Author:
- Hayman GD and Derwent RG
- Year:
- 1 997
- Bibliographic source:
- Environmental Science and Technology 31, 327-336
- Reference Type:
- publication
- Title:
- A global three-dimensional study of the fate of HCFCs and HFC-134a in the troposphere
- Author:
- Kanakidou M, Dentener FJ, Crutzen PJ
- Year:
- 1 995
- Bibliographic source:
- Journal of Geophysical research. Vol.100:18781-18801
- Reference Type:
- publication
- Title:
- Kinetic and Mechanisms for the reactions of halogenated organic compounds in the troposphere. Commission of the European Communities and Alternative Fluorocarbons Environmental Acceptability Study
- Author:
- AFEAS
- Year:
- 1 993
- Bibliographic source:
- STEP-HALOCSIDE/AFEAS workshop, Dublin 23-25 March 1993
- Reference Type:
- review article or handbook
- Title:
- Unnamed
- Year:
- 1 989
- Reference Type:
- review article or handbook
- Title:
- Unnamed
- Year:
- 1 991
- Reference Type:
- review article or handbook
- Title:
- Unnamed
- Year:
- 1 998
Materials and methods
Test material
- Reference substance name:
- Difluoromethane
- EC Number:
- 200-839-4
- EC Name:
- Difluoromethane
- Cas Number:
- 75-10-5
- Molecular formula:
- CH2F2
- IUPAC Name:
- difluoromethane
Constituent 1
Results and discussion
Any other information on results incl. tables
No remarks
Applicant's summary and conclusion
- Conclusions:
- Because of its low reactivity with OH, HFC-32 will not contribute significantly to the formation of ground ozone (Hayman et al. 1997).
Degradation in % (for indirect photolysis): = 50 after 3.4 year - Executive summary:
Summaries of studies
The atmospheric degradation of HFCs has been extensively studied through different research programs from industry (AFEAS) and from EU (Step Halocside project) (STEP-HALOCSIDE/AFEAS, 1993) and were reported in the different WMO-UNEP scientific assessments on stratospheric ozone. (WMO 1989,1991).
HFC-32 will degrade into C(=O)F2 as an intermediate product, which will be ultimately converted to HF and CO2 by hydrolysis in atmospheric water. By analogy with phosgene, the atmospheric lifetime of C(=O)F2 by wet removal can be estimated at 70 days (or a ½ life of 48.5 days) as an average value (WMO 1998). In a 3 dimensions atmospheric model calculation (Kanakidou et al, 1995), it was estimated that the abundance of the degradation products would be about 1% of the parent compound. It has also been shown that the flux of F- produced by the tropospheric degradation of HCFC and HFC would be negligible in comparison with the natural burden and fluxes of F- anion in the environment. (WMO 1989)
Because of its low reactivity with OH, HFC-32 will not contribute significantly to the formation of ground ozone (Hayman et al. 1997).
Degradation in % (for indirect photolysis): = 50 after 3.4 year
Degradation products:
Carbon dioxide (CAS No. 124-38-9)
Carbonyl difluoride (CAS No. 353-50-4)
Hydrogen fluoride (CAS No. 7664-39-3)
References
- Hayman GD and Derwent RG (1997) Atmospheric chemical reactivity and ozone-forming potentials of potential CFC replacements, Environmental Science and Technology 31, 327-336.
- Kanakidou M, Dentener FJ, Crutzen PJ(1995)A global three-dimensional study of the fate of HCFCs and HFC-134a in the troposphere.Journal of Geophysical research. Vol.100, pp 18781-18801.
- STEP-HALOCSIDE/AFEAS workshop, Dublin 23-25 March 1993. Kinetic and Mechanisms for the reactions of halogenated organic compounds in the troposphere. Commission of the European Communities and Alternative Fluorocarbons Environmental Acceptability Study.
- WMO 1989, Global ozone research monitoring project- report N°20. Scientific Assessment of stratospheric Ozone, Vol II.
- WMO 1991, Global ozone research monitoring project- report N°25. Scientific Assessment of ozone depletion: 1991.
- WMO 1998, Global ozone research monitoring project- report N°44. Scientific Assessment of ozone depletion: 1998.
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