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EC number: 201-201-8
CAS number: 79-38-9
Aquatic toxicity studies are not proposed by the registrant because
direct or indirect exposure of the aquatic compartment is unlikely to
occur as the substance is a volatile gas 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) which
primarily and rapidly partition the atmosphere where it remains.
The above considerations have been deducted on the following basis:
The Guidance on Information Requirements and Chemical Safety Assessment
Chapter R.7a: Endpoint Specific Guidance, Appendix R.7.1-4 indicates
that substances with a Henry's Law constant of around 1 hPa m3/mole will
rapidly volatilise from water. On the basis of a Henry’s Law constant of
31,500 Pa m3/mol (HENRYWIN v3.20, EPISUITE v1.00), a vapour pressure of
612 kPa at 25°C (ISCS No. 0685, NIOSH) and a moderate water solubility,
CTFE is expected to primarily and rapidly partition to the atmosphere.
The value of water solubility of 380 mg/l was
experimentally determined in a completely sealed system with an
atmosphere saturated with CTFE. Although
the 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 EQC Fugacity III Model (Version 2.02, The Canadian Centre for
Environmental Modelling and Chemistry, May 2003)
The specific properties of the substance, cited above, indicates the
difficulty to properly test CTFE and provide meaningful results of its
aquatic toxicity for this reason any experimental aquatic toxicity data
are available. However, in order to evaluate the aquatic hazard profile
of CTFE despite the fact, that it is expected to rapidly partition to
the atmospheric compartment, the ECOSAR model may be applied.
All ECOSAR results are reported in the specific endpoints of this
section however, the ECOSAR model cannot be
considered reliable for the ECOSAR class of chemicals which CTFE is
assigned to, since the results are either based on a very limited
dataset of substances or, as for the most sensitive and critical group
of the food chain the fish, the coefficient of determination R^2 is low.
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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