Registration Dossier
Registration Dossier
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EC number: 201-201-8 | CAS number: 79-38-9
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no data: aquatic toxicity unlikely
Marine water
- Hazard assessment conclusion:
- no data: aquatic toxicity unlikely
STP
- Hazard assessment conclusion:
- no data: aquatic toxicity unlikely
Sediment (freshwater)
- Hazard assessment conclusion:
- no exposure of sediment expected
Sediment (marine water)
- Hazard assessment conclusion:
- no exposure of sediment expected
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no exposure of soil expected
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
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 CTFE hence 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 calculated.
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 discussed above.
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., 1991).
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).
Conclusion on classification
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).
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