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IN BRIEF – JUNE 2018

IN BRIEF – JUNE 2018

28.05.2018

The very short atmospheric lifetimes (days) means that HFOs do not accumulate in the atmosphere and result in very low global warming potentials (GWPs) (<10, typically 2 or less). TFA (trifluoroacetic acid or acetate), is a breakdown product of only some HFOs, and TFA yield (shown in the table) depends on the atmospheric breakdown pathways. TFA is a naturally occurring substance, which is stable in the environment and resistant to further degradation (breakdown). Over 200 million tonnes are present in the oceans and more than 95% of TFA found in the oceans is naturally produced.

References:

For TFA

Theoretical and experimental studies on the atmospheric degradation of 2-bromo-3,3,3-trifluoropropene, Weiwang Chen, Xiaomeng Zhou and Yajun Han, Phys. Chem. Chem. Phys., 2015, 17, 20543—20550
A three-dimensional model of the atmospheric chemistry of E and ZCF3CH=CHCl (HCFO-1233(zd) (E/Z)) Mads P. Sulbaek Andersena, Johan A. Schmidt, Aleksandra Volkova, Donald J. Wuebbles. Atmospheric Environment 179 (2018) 250–259
Solomon, K.R., Velders, G.J., Wilson, S.R., Madronich, S., Longstreth, J., Aucamp, P.J., Bornman, J.F. (2016): Sources, fates, toxicity, and risks of trifluoroacetic acid and its salts: Relevance to substances regulated under the Montreal and Kyoto Protocols. Journal of Toxicology and Environmental Health Part B, 19, pp 289-304
Wallington, T.J., Sulbaek Andersen, M.P., Nielsen, O.J. (2014): Atmospheric chemistry of sort-chain haloolefins: Photochemical ozone creation potentials (POCPs), global warming potentials (GWPs), and ozone depletion products (ODPs). Chemosphere, 129, pp 135-141

For GWP

AR5 values, except for HBFO-1233xfB: Patten, K. O., V. G. Khamaganov, V. L. Orkin, S. L. Baughcum, and D. J. Wuebbles (2012), Correction to “OH reaction rate constant, IR absorption spectrum, ozone depletion potentials and global warming potentials of 2-bromo-3,3,3-trifluoropropene,” J. Geophys. Res., 117, D22301, doi:10.1029/2012JD01905