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EC number: 201-201-8
CAS number: 79-38-9
CTFE is a volatile gas at ambient conditions
with a boiling point in the range of -26.2°C (The Beilstein database.
Reference: Miller - 1951 ) to -26.8°C (The Beilstein database.
Reference: Henne - 1948), in addition, in case of accidental emission,
it is released only to air compartment as indicated from the EQC
Fugacity III Model (v.2.02, The Canadian Centre for Environmental
Modelling and Chemistry, May 2003).
In addition on the basis of its Henry's Law
constant of 31,500 P m^3/mol (HENRYWIN v3.20, EPISUITE v1.00), its
vapour pressure of 612 KPa at 25°C (NIOSH, ICSC No.0685) and
a moderate water solubility (the value of water solubility of 380 mg/l
has been evaluated in a closed system with the atmosphere saturated of
it represents an overestimation of the actual water solubility of CTFE
in the natural system),
it is expected that CTFE rapidly
volatilize from water.
Hence, due to the gaseous nature of the
substance, its partition to the atmosphere, its limited water solubility
as well as the consequent difficulty to appropriately test CTFE and
provide meaningful results, no experimental aquatic toxicity data are
reported, consequently PNECs for aquatic organisms have not been
PNECs for sediment (freshwater or marine)
and soil can't be derived and are technically not feasible, as CTFE is
expected to primarly and rapidly partition to the atmosphere as also
PNEC for air are not calculated since CTFE
is not considered to represent an hazard.
It has been
shown that CTFE, as well as other haloethylenes does not reach the
stratosphere and so does no contribute to the ozone-depletion layer
since its reaction in the troposphere is fast (Abbatt J.P.D et al.,
In the atmosphere CTFE is rapidly
degraded by reaction with photochemically produced hydroxyl radicals
with half-lives, determined from experimentally derived rate constants.
A rate constant for the chlorine-atom initiated oxidation of
chlorotrifluoroethylene in the atmosphere gives CClF2CF(O) as the major
product; the quantum yield of oxidation for this reaction is >1000
relative to the quantum yield for olefin(Sanhueza
E et al.1956, see Section 5.6), Reaction with ozone gives an
estimated half-life of 715 days(Meylan W.M, 1993,see
Section 5.6). The primary product of this reaction is the corresponding
carbonyl product (Heicklen J.P.,1975, see Section 5.6). A
rate constant of 2.7X10-11 cm cu/mol sec is reported for the reaction of
chlorotrifluoroethylene with atomic oxygen (Heicklen J.P.,1975. see
Section 5.6). C2F3Cl is NOT listed in the Scientific Assessment
of Ozone Depletion of the World Metereological Organization/United
nations Environment Programme (WMO/UNEP) or the Montreal Protocol as it
is NOT considered as a substance contributing to the Ozone depletion
(Laube J.C., 2008, see Section 5.6).
Since CTFE is a gas at
ambient conditions (used in sealed systems) and its water solubility is
limited, it does not represent a hazard to aquatic life. For this
reason, no aquatic toxicity testing has been conducted. ECOSAR
predictions for aquatic toxicity are applied however the results are not
considered in this assessment as the
ECOSAR model cannot be considered reliable for the ECOSARclass of
chemicals which CTFE is assigned to.
It can be concluded that CTFE does not pose a toxicity risk to aquatic
or terrestrial organisms in the unlikely event of entering and remaining
in these compartments water or soil long enough to potentially affect
organisms at all.
Based on the above considerations the substance is neither
classifiable for acute nor chronic aquatic toxicity according to CLP
(EC No 1272/2008).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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