Registration Dossier

Administrative data

Endpoint:
phototransformation in air
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Data source is authoritative.

Data source

Reference
Reference Type:
publication
Title:
Unnamed
Year:
2002

Materials and methods

Test guideline
Qualifier:
no guideline followed
GLP compliance:
not specified

Test material

Constituent 1
Chemical structure
Reference substance name:
1,1,2-trichloro-1,2-difluoroethane
EC Number:
940-543-9
Cas Number:
354-15-4
Molecular formula:
C2HCl3F2
IUPAC Name:
1,1,2-trichloro-1,2-difluoroethane
Test material form:
other: liquid
Details on test material:
- Name of test material (as cited in study report): CHFCl–CFCl2
Two samples from two different sources were analized:

Sample 1:
- Analytical purity: >99.7 %

Sample 2:
- Analytical purity: >98.3%
- Impurities (identity and concentrations): CHCl2CF2Cl as main impurities

Results and discussion

Any other information on results incl. tables

Atmospheric lifetime = 3.4 years

Relative radiative forcing (RRFi CFC-11) = 0.91

HGWP = 0.051

 

HGWP at 20 years = 0.15

HGWP at 100 years = 0.059

HGWP at 500 years = 0.051

 

GWP at 20 years = 770

GWP at 100 years = 240

GWP at 500 years = 71

In the attached table the integrated band intensities of HCFC-122a.

Applicant's summary and conclusion

Conclusions:
Atmospheric lifetime = 3.4 years
Relative radiative forcing (RRFi CFC-11) = 0.91
HGWP = 0.051
 
HGWP at 20 years = 0.15
HGWP at 100 years = 0.059
HGWP at 500 years = 0.051
 
GWP at 20 years = 770
GWP at 100 years = 240
GWP at 500 years = 71
Executive summary:

In the study the infrared absorption cross-sections and integrated band intensities (IBIs) for 21 haloalkanes, including HCFC 122a, were measured over thewavenumber range 400–1600 cm1 atT=295 K. The effect of air pressure on measured spectra was also investigated. These results were used to demonstrate a simple calculational approach for estimating the direct global warming potentials (GWPs) of such chemicals.

Direct GWPs were determined using these measured spectra and a simple numerical procedure based on the measured spectrum of the Earth’s outgoing radiation. The results obtained with this procedure agree with those from elaborate modeling calculations.

 

The following values for HCFC 122a are reported:

 

Atmospheric lifetime = 3.4 years

Relative radiative forcing (RRFi CFC-11) = 0.91

HGWP = 0.051

 

HGWP at 20 years = 0.15

HGWP at 100 years = 0.059

HGWP at 500 years = 0.051

 

GWP at 20 years = 770

GWP at 100 years = 240

GWP at 500 years = 71