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Diss Factsheets

Administrative data

Endpoint:
phototransformation in air
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Estimated value based on accepted model. Only study summary reviewed from secondary source.

Data source

Referenceopen allclose all

Reference Type:
publication
Title:
No information
Author:
Atkinson, R.
Year:
1989
Bibliographic source:
J. Chem. Phys. Ref. Data Monograph (HSDB/6752)
Reference Type:
publication
Title:
No information
Author:
Brown, A.C. et al
Year:
1990
Bibliographic source:
Atmos. Environ. Path. Chem., 24A: 2499-511 (HSDB/6752)
Reference Type:
publication
Title:
No information
Author:
Carassiti, V. et al.
Year:
1997
Bibliographic source:
J. Environ. Path. Toxicol. Oncol., 16 (HSDB/6752)
Reference Type:
publication
Title:
No information
Author:
Cohen, N. and S.W. Benson
Year:
1987
Bibliographic source:
J. Phys. Chem, 91: 162-70 (HSDB/6752)
Reference Type:
publication
Title:
No information
Author:
Cohen, N. and S.W. Benson
Year:
1987
Bibliographic source:
J. Phys. Chem., 91: 171-5 (HSDB/6752)
Reference Type:
publication
Title:
No information
Author:
Fisher, D.A. et al
Year:
1990
Bibliographic source:
Nature, 344: 508-512 (HSDB/6752)
Reference Type:
publication
Title:
No information
Author:
Rattigan, O. et al
Year:
1993
Bibliographic source:
SPA-AFEAS Final Report (P91-69)

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
other: modeled
GLP compliance:
not specified

Test material

Constituent 1
Reference substance name:
Ethane, 2,2-dichloro-1,1,1-trifluoro-
IUPAC Name:
Ethane, 2,2-dichloro-1,1,1-trifluoro-
Constituent 2
Chemical structure
Reference substance name:
2,2-dichloro-1,1,1-trifluoroethane
EC Number:
206-190-3
EC Name:
2,2-dichloro-1,1,1-trifluoroethane
Cas Number:
306-83-2
Molecular formula:
C2HCl2F3
IUPAC Name:
2,2-dichloro-1,1,1-trifluoroethane
Details on test material:
- Name of test material (as cited in study report): Ethane, 2,2-dichloro-1,1,1-trifluoro, HCFC-123

Study design

Light source:
not specified
Details on light source:
Relative intensity based on intensity of sunlight.

Results and discussion

Any other information on results incl. tables

The calculated atmospheric lifetime for HCFC-123 ranges from 1.2-2.4 years (Fisher et al., 1990; Carasiti et al., 1997). Experimental rate constants for the gas-phase reaction of HCFC-123 with photochemically produced hydroxyl radicals of 1.4x10-14 cm3/molec-sec (Cohen and Benson, 1987a; 1987b) and 5.9x10-14 cm3/molec-sec at 303 K (Brown et al., 1990) have been reported. The recommended value of 3.35x10-14 cm3/molec-sec (Atkinson, 1989) translates to an atmospheric half-life of 479 days using an average hydroxyl radical concentration of 5x105 molecules/cm3 (Atkinson, 1989). HCFC-123 is removed predominately in the lower troposphere due to the reaction with the hydroxyl radical (Rattigan et al., 1993).

Applicant's summary and conclusion

Validity criteria fulfilled:
not applicable
Conclusions:
The calculated atmospheric lifetime for HCFC-123 ranges from 1.2-2.4 years (Fisher et al., 1990; Carasiti et al., 1997). Experimental rate constants for the gas-phase reaction of HCFC-123 with photochemically produced hydroxyl radicals of 1.4E-14 cm3/molec-sec (Cohen and Benson, 1987a; 1987b) and 5.9E-14 cm3/molec-sec at 303 degrees K (Brown et al., 1990) have been reported. The recommended value of 3.35E-14 cm3/molec-sec (Atkinson, 1989) translates to an atmospheric half-life of 479 days using an average hydroxyl radical concentration of 5E5 molecules/cm3 (Atkinson, 1989). HCFC-123 is removed predominately in the lower troposphere due to the reaction with the hydroxyl radical (Rattigan et al., 1993).