Trifluoro(trifluoromethyl)oxirane

Additional information on environmental fate and behaviour

Administrative data

Endpoint:

additional information on environmental fate and behaviour

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GWP calculation according to standard method, acceptable for assessment

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Principles of method if other than guideline:

IR spectrum obtained according to EPA method 320, integrated according to Pinnock et al (1995) (J. Geophys. Res., 100, 23227-23238) and used to estimate Global warming potential according to IPCC methods.

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

Trifluoro(trifluoromethyl)oxirane

EC Number:

207-050-4

EC Name:

Trifluoro(trifluoromethyl)oxirane

Cas Number:

428-59-1

Molecular formula:

C3F6O

IUPAC Name:

2,2,3-trifluoro-3-(trifluoromethyl)oxirane

Test material form:

gas under pressure: liquefied gas

Details on test material:

- Analytical purity: ca. 99.7% by 19F-NMR and 1H-NMR
- Name of test material (as cited in study report): Hexafluoropropylene oxide (HFPO)
- Substance type: Single-component substance
- Physical state: gas
- Storage condition of test material: as a pressurized liquid

Results and discussion

Any other information on results incl. tables

See attachment for infrared (IR) spectrum of HFPO. Average cross-section in the absorbance range of ozone (1000 - 1100 cm^-1) was >0.148, indicating that the radiative forcing does not need to be corrected for confounding by ozone absorbance. Instantaneous radiative forcing was used directly. The instantaneous radiative forcing is 0.260 W∙m^-2∙ppbV^-1.  Assuming an atmospheric lifetime range of 90 years, the 100-year GWP of HFPO is 6200.

Applicant's summary and conclusion

Conclusions:

The 100-year GWP of HFPO is 6200.

Executive summary:

Potential effects of HFPO on climate were addressed by calculation of 100-year integrated global warming potential (100-year GWP). A high-resolution infrared spectrum was taken using a protocol following EPA method 320. Integrated IR cross-section and radiative forcing were calculated using the approach of Pinnock et al (J. Geophys. Res., 100, 23227-23238). Atmospheric lifetime was determined in this study to be 90 years (reported elsewhere in this dossier, see section "Phototransformation in air"). GWP was calculated for this study summary using the WMO 1998 model with updated CO2 response and forcing. The integrated instantaneous radiative forcing was 0.260 W∙m^-2∙ppbV^-1. The 100-year GWP is 6200. A 20-year GWP of 6400 was also determined.

 

No testing guideline has been promulgated to determine global warming potential. However, the infrared cross-section data were collected according EPA method 320, and the radiative forcing and GWP were calculated by methods accepted by IPCC. Therefore, this study is classified as reliable without restrictions.