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Environmental fate & pathways

Phototransformation in air

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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: The research was done at reputable laboratories and the results published in a peer reviewed journal

Data source

Reference
Reference Type:
publication
Title:
Unnamed
Year:
2008

Materials and methods

Principles of method if other than guideline:
The products of Cl and OH radical initiated oxidation of CF3CF=CH2 were studied in a 700 Torr of N2/O2 diluent at 296 +/- 1K.
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
>99.9%
purity >99.9%
sample supplied by Honeywell

Study design

Light source:
other: fluorescent backlamps

Results and discussion

% Degradation
% Degr.:
ca. 100
Sampling time:
10 d

Any other information on results incl. tables

The OH initiated oxidation of CF3CF=CH2 gives CF3C(O)F and HCHO in almost quantitative yields. CF3C(O)F is removed from the atmosphere via hydrolysis that occurs at a time scale of about 10 days to give CF3C(O)OH, just like 134a (CF3CH2F) does. The available data suggest that while CF3C(O)OH is not a natural component of the freshwater environment, it is a natural component of the background oceanic environment, and any additional burden associated with CF3CF=CH2 oxidation will be of negligible environmental significance.

Similarly HC(O)H decomposes to H2O and CO, the latter oxidizing to CO2 in the atmosphere.

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Conclusions:
The atmospheric decomposition of CF3CF=CH2 will have negligible environmental impact.
Executive summary:

The atmospheric lifetime of CF3CF=CH2, dictated by its reaction with OH radicals, is approximately 11 days. The major atmospheric oxidation product of CF3CF=CH2 is CF3C(O)F. The atmospheric fate of CF3C(O)F is hydrolysis which occurs

We show here that is the major atmospheric oxidation product of CF3CF=CH2. The atmospheric fate of CF3C(O)F is hydrolysis which occurs on a time scale of approximately 10 days to give CF3C(O)OH. While CF3C(O)OH is not a natural component of the freshwater environment, it is a natural component of the background oceanic environment, and any additional burden associated with CF3CF=CH2 oxidation will be of negligible environmental significance. We conclude that the products of the atmospheric oxidation of CF3CF=CH2 have negligible environmental impact.