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EC number: 201-201-8
CAS number: 79-38-9
Chlorotrifluoroethylene (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) a vapour pressure of 612 kPa at 25°C (ISCS No.
0685, NIOSH) . CTFE is also characterized by a moderate water solubility
of 380 mg/L.
The value of water solubility of 380 mg/l was
experimentally determined in a completely sealed system with an
atmosphere saturated with CTFE. Althoughthe
value of 380 mg/l itself reveals a moderate water solubility, it
represents an overestimation of the actual water solubility of CTFE in
the natural system since the experimental conditions did not represent
the natural conditions.
the Guidance on Information Requirements and Chemical Safety Assessment
Chapter R.7a: Endpoint Specific Guidance, Appendix R.7.1-4 indicating
that substances, with a Henry's Law constant of around 1 hPa m3/mole,
rapidly volatilize from water.
Basing on its physico-chemical properties it is expected that CTFE
primarily and rapidly partitions to the atmosphere. In addition the EQC
Fugacity III Model (Version 2.02, The Canadian Centre for
Environmental Modelling and Chemistry, May 2003)
Due to the gaseous nature of the substance and its partition to the
atmosphere, as well as the consequent difficulty to appropriately test
CTFE and provide meaningful results, no experimental data are reported
for the adsorption/desorption endpoint. However, in order to evaluate
the soil adsorption hazard profile of CTFE despite the fact that it is
expected to rapidly partition to the atmosphere compartment, the results
of the KOCWIN model ( v.2.0, EPI Suite v 4.0) are attached.
As indicated in the Guidance on Information Requirements and Chemical
Safety Assessment Chapter R.7a: Endpoint Specific Guidance, Appendix
R.7.1.15 (Adsorption/Desorption), substances with a Koc below 500 -1,000
L/Kg are generally unlikely to adsorb to sediment. The estimated soil
adsorption coefficient of CTFE ( Koc = 94.94 L/Kg from MCI and Koc =
27.02 L/Kg from log Kow) indicates that the potential adsorption of CTFE
to soil and sediment is expected to be low.
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), Reaction with ozone gives an estimated half-life of
715 days (Meylan W.M, 1993). The primary product of this
reaction is the corresponding carbonyl product (Heicklen J.P.,1975).
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).
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.,
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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