Registration Dossier
Registration Dossier
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EC number: 200-839-4 | CAS number: 75-10-5
Distribution modelling
Administrative data
- Endpoint:
- distribution modelling
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
Data source
Reference
- Reference Type:
- publication
- Title:
- No information
- Author:
- Pederson F, Tyle H, Niemelä JR, Guttmann B, Lennart L and Wederbrandt A
- Year:
- 1 994
- Bibliographic source:
- Environmental Hazard Classification- data collection and interpretation guide; 589
Materials and methods
- Model:
- calculation according to Mackay, Level I
- Calculation programme:
- Nordbas1 - Databases developed by The Nordic Chemicals Group. Included in: Pedersen F. & J. Falck. 1997. Environmental Hazard Classification – classification of selected substances as dangerous for the environment (Il). TemaNord 1997:549. Nordic Council of Ministers, Copenhagen.
- Release year:
- 1 997
- Media:
- air - biota - sediment(s) - soil - water
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
Study design
- Environmental properties:
- No data
Results and discussion
Percent distribution in media
- Air (%):
- 99.99
- Water (%):
- 0.01
- Soil (%):
- 0
- Sediment (%):
- 0
- Biota (%):
- 0
- Other distribution results:
- No data
Any other information on results incl. tables
fugacity level 1 calculation (NORDBAS1)
Temperature (C) 25
Molecular weight 52
Vapor pressure (Pa) 1690000
solubility (g/m3) 4400
solubility (mol/m3) 84.62
Henry's law constant (Pa.m3/mol) 19972.73
log kow 0.21
Octanol-water partition coefficient 1.62
Organic C-water partition coefficient 0.66
Air-water partition coefficient 8.06
Soil-water partition coefficient 0.02
Sediment-water partition coefficient 0.04
Amount of chemical (moles) 1
Fugacity (Pa) .41307669E-6
Total VZ products 2420857.97
Applicant's summary and conclusion
- Conclusions:
- Approximately 99.99 % of difluoromethane released into the environment will enter the air compartment, 0.01 % the water and 0.18 E-5 % the soil.
- Executive summary:
A theoretical distribution of difluoromethane has been calculated at 25 °C using the fugacity model level 1 of Mackay (Nordbas1) with a vapor pressure of 16,900 hPa and a solubility of 4.4 g/l. Approximately 99.99 % of difluoromethane released into the environment will enter the air compartment, 0.01 % the water and 0.18 E-5 % the soil.
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