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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

Referenceopen allclose all

Reference Type:
publication
Title:
Unnamed
Year:
2008
Reference Type:
publication
Title:
Unnamed
Year:
2007

Materials and methods

Principles of method if other than guideline:
The products of Cl and OH radical initiated oxidation of trans-CF3CH=CHF 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:
purity >99.9%
sample supplied by Honeywell

Study design

Light source:
other: fluorescent backlamps

Results and discussion

% Degradation
% Degr.:
ca. 100
Sampling time:
2 wk

Any other information on results incl. tables

Hydroxyl radical initiated oxidation leads to the formation of CF3CHO and HC(O)F in yields which were indistinguishable from 100% and were not dependent on the O2 partial pressure. Chlorine atom initiated oxidation gives HC(O)F, CF3CHO, CF3C(O)Cl, and CF3C(O)CHFCl. The yields of CF3C(O)Cl and CF3C(O)CHFCl increased at the expense of HC(O)F and CF3CHO as the O2 partial pressure was increased over the range 5–700 Torr.

Long path length FTIR-smog chamber techniques were used to measure k(Cl + t-CF3CH=CHF) = (4.64 ± 0.59) x 10 e-11, k(OH + t- CF3CH=CHF) = (9.25 ± 1.72) · 10e-13, and k(O3 + t-CF3CH=CHF) = (2.81 ± 0.21) · 10e-21 cm3/molecule/sin 700 Torr of air diluent at 296 K. The atmospheric lifetime of t-CF3CH=CHF is determined by its reaction with OH and is approximately two weeks. t-CF3CH=CHF has an integrated IR absorption cross section (650–2000 cm-1) of (1.94 ± 0.10) · 10e-16 cm/molecule and a global warming potential of approximately 6 (100-year time horizon). As part of this work the reaction of ozone with C2H4 was determined to proceed with a rate constant of (1.46 ± 0.13) · 10e-18 cm3 /molecule/sin 700 Torr of air at 296 K.

Applicant's summary and conclusion

Conclusions:
The atmospheric decomposition of HFO-1234ze will have negligible environmental impact.
Executive summary:

Hydroxyl radical initiated oxidation leads to the formation 5 of CF3CHO and HC(O)F in yields which were indistinguishable from 100% and were not dependent on the O2 partial pressure. Chlorine atom initiated oxidation gives HC(O)F, CF3CHO, CF3C(O)Cl, and CF3C(O)CHFCl. The yields of CF3C(O)Cl and CF3C(O)CHFCl increased at the expense of HC(O)F and CF3CHO as the O2 partial pressure was increased over the range 5–700 Torr.