1,1,1-trichloro-2,2,2-trifluoroethane
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1,1,1-Trichloro-2,2,2-trifluoroethane, also called Asymmetrical trichlorotrifluoroethane or CFC-113a, is a
chlorofluorocarbon Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) are fully or partly Halogenation, halogenated hydrocarbons that contain carbon (C), hydrogen (H), chlorine (Cl), and fluorine (F). They are produced as volatility (chemistry), volat ...
(CFC) with the formula .


Ozone depletion

A team of researchers at the
University of East Anglia The University of East Anglia (UEA) is a Public university, public research university in Norwich, England. Established in 1963 on a campus university, campus west of the city centre, the university has four faculties and twenty-six schools of ...
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 Anthropogenic ("human" + "generating") is an adjective that may refer to: * Anthropogeny, the study of the origins of humanity Anthropogenic may also refer to things that have been generated by humans, as follows: * Human impact on the enviro ...
sources in the 1960s and that while the abundance of certain CFCs had decreased, owing to the
Montreal Protocol The Montreal Protocol on Substances That Deplete the Ozone Layer is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion. It was agreed on 16 ...
, the abundance of CFC-113a in the atmosphere was still growing. Its main source remained uncertain, but production of
hydrofluorocarbons Hydrofluorocarbons (HFCs) are synthetic organic compounds that contain fluorine and hydrogen atoms, and are the most common type of organofluorine compounds. Most are gases at room temperature and pressure. They are frequently used in air condit ...
in East Asia was suspected. Between 2012 and 2017, concentrations of the gas jumped by 40 percent. 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.


See also

* 1,1,2-Trichloro-1,2,2-trifluoroethane


References

{{DEFAULTSORT:Trichloro-2, 2, 2-Trifluoroethane, 1, 1, 1- Chlorofluorocarbons Greenhouse gases Refrigerants Trifluoromethyl compounds Trichloromethyl compounds Chlorofluoroalkanes