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Environmental fate & pathways

Biodegradation in water: screening tests

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No experimental data on CTFE degradation in water 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 indicate 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 partitioning of CTFE into water. 

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On the grounds of the physico-chemical properties of CTFE and the results on environmental fate obtained from EQC Fugacity III Model (Version 2.02, The Canadian Centre for Environmental Modelling and Chemistry, May 2003), the substance is expected to primarily and rapidly partition to the atmosphere. No release to the aquatic environment is consequently expected. Moreover, according to Appendix R.7.1-4 from the Guidance on Information Requirements and Chemical Safety Assessment Chapter R.7a, the Henry Law Constant estimated for CTFE (31500 Pa m³/mol at 25°C, HENRYWIN, EPI SUITE v. 4.0,US EPA) suggests a rapid volatilization of the substance from water.

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 and soil. Nevertheless a further assessment based on Quantitative Structure Activity Relationships (QSARs) has been however applied.

Particularly, in order to evaluate the biodegradation hazard profile of CTFE, the BIOWIN v.4.10, EPI Suite v.4.0 model has been applied.

The prediction of the BIOWIN model suggests that CTFE is not ready biodegradable. Nevertheless no adverse effects on water and sediment organism are expected because of no partitioning of CTFE into water.