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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

VDF is not expected to be readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

No biodegradation screening studies have been performed for VDF, however data is available for related gaseous materials (e. g. pentafluoroethane vinylidine chloride). Results with these substances showed ≤ 5% degradation indicating that transformation to metabolites in soil and water may be considered very low (SIDS, 2005 and NITE, 1992). Based on these structural analogues, VDF is not expected to be readily biodegradable (see Annex 4 for the Reporting Format). In addition, calculated data is available from the BIOWIN™ model (U.S. EPA, 2000) the results indicate that VDF will degrade in water and soil (timeframe of days to weeks). Validation of this model showed thatthe prediction “ready biodegradable” is frequently not in agreement with experimental data obtained by the MITI I test. Therefore it is recommended to use the results of the BIOWINmodelonly in a conservative way. If the program predicts fast biodegradation, this estimate should not be taken into consideration. However, if the program predicts slow biodegradation this can be used as a confirmation of not readily biodegradable (Pavan and Worth, 2006). Therefore the results of the BIOWIN™ model were assigned as not reliable.