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EC number: 201-201-8
CAS number: 79-38-9
No experimental data on CTFE biodegradation in water and sediment are available. In fact, on the grounds of the physico-chemical properties and environmental fate assessments of the substance, no release to the aquatic environment is expected. Moreover the substance profile itself indicates the difficulty to properly test CTFE and provide meaningful results of its biodegradation in aqueous systems as well as in sediment. Nevertheless, in order to evaluate the biodegradation hazard profile of CTFE, the BIOWIN v. 4.10 model has been applied. The prediction obtained from the model suggests that CTFE is not ready biodegradable. However, no adverse effects on aquatic organisms are expected because of no partitioningof CTFE into water.
The biodegradation studies in surface water and in sediment
(required in sections 184.108.40.206 and 220.127.116.11, respectively) of REACH
(Regulation (EC) No 1907/2006) Annex IX, are not proposed by the
registrant as CTFE
is a gas at ambient condition with a limited water solubility and an
rapidly volatilise from water to the air.
The value of water solubility of 380 mg/l was
experimentally determined in a completely sealed system with an
atmosphere saturated with CTFEE. 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 Henry’s Law constant of CTFE was
calculated to be 31.500 Pa m3/mol (HENRYWIN v3.20, EPI Suite v4.0),
suggesting that the substance is expected to rapidly volatilise from
water to the air.
On the basis of its physico-chemical properties, CTFE is expected
to primarily and rapidly partition to the atmosphere. This tendency is
also confirmed by the results from the EQC Fugacity III Model (Version
2.02, The Canadian Centre for Environmental Modelling and Chemistry, May
2003) which makes absolutely remote the possibility of a CTFE
partitioning into water and sediments.
Moreover the substance profile itself
indicates the difficulty to properly test CTFE and provide meaningful
results of its biodegradation in aqueous systems as well as in sediment.
Nevertheless an assessment based on Quantitative Structure
Activity Relationships (QSARs) has been however applied as far as
biodegradation is concerned.
on water and sediment organism are
expected because of no partitioning of CTFE into water.
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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