1,1,1-Trichloro-2,2,2-trifluoroethane explained

1,1,1-Trichloro-2,2,2-trifluoroethane, also called Asymmetrical trichlorotrifluoroethane or CFC-113a, is a chlorofluorocarbon (CFC) with the formula .

Ozone depletion

A team of researchers at the University of East Anglia analysed unpolluted air samples from Tasmania dating from the period 1978 to 2012. They concluded that the CFCs they studied had started entering the atmosphere from anthropogenic sources in the 1960s and that while the abundance of certain CFCs had decreased, owing to the Montreal Protocol, the abundance of CFC-113a in the atmosphere was still growing.^[1] Its main source remained uncertain, but production of hydrofluorocarbons in East Asia was suspected.^[2] Between 2012 and 2017, concentrations of the gas jumped by 40 percent.^[3] In 2020, the global mean concentration of CFC-113a was 1.02 parts per trillion with global emissions of 2.5 ± 0.4 ODP-Gg yr⁻¹.^[4]

See also

• 1,1,2-Trichloro-1,2,2-trifluoroethane

Notes and References

1. Laube. Johannes C.. Mike J. . Newland . Christopher . Hogan . Carl A. M. . Brenninkmeijer . Paul J. . Fraser . Patricia . Martinerie . David E. . Oram . Claire E. . Reeves . Thomas . Röckmann . Jakob . Schwander . Emmanuel . Witrant . William T. . Sturges. Newly detected ozone-depleting substances in the atmosphere. Nature Geoscience. 7. 4. 266–269. 9 March 2014. 10.1038/ngeo2109. 2014NatGe...7..266L. 140544959 .
2. News: McGrath. Matt. Mysterious new man-made gases pose threat to ozone layer. BBC News. 9 March 2014. 10 March 2014.
3. Adcock. Karina . Claire . Reeves . Lauren . Gooch . Emma . Leedham Elvidge . Matthew . Ashfold . Carl . Brenninkmeijer . Charles . Chou . Paul . Fraser . Ray . Langenfelds . Norfazrin . Mohd Hanif . Simon . O'Doherty . David . Oram. Chang-Feng . Ou-Yang . Siew Moi . Phang . Azizan Abu . Samah . Thomas . Röckmann . William . Sturges . Johannes . Laube . Continued increase of CFC-113a (CCl3CF3) mixing ratios in the global atmosphere: emissions, occurrence and potential sources . Atmospheric Chemistry and Physics . 18 . 7 . 4737–4751 . 9 April 2018. 10.5194/acp-18-4737-2018 . 2018ACP....18.4737A . free .
4. Western . Luke M. . Vollmer . Martin K. . Global increase of ozone-depleting chlorofluorocarbons from 2010 to 2020 . Nature Geoscience . 3 April 2023 . 309–313 . 16 . 4 . 10.1038/s41561-023-01147-w . 2023NatGe..16..309W . 1983/9e103fef-e61c-49c7-a1a3-902540ec1d7c . 257941769 . 1. free .