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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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biodegradation in water: simulation testing on ultimate degradation in surface water
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other justification
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A degradation rate of 2% was observed for 2,3,3,3-Tetrafluoropropene in a ready biodegradability test following OECD 301D. The substance 2,3,3,3-Tetrafluoropropene is a gas and the calculated Henrys Law Constant indicates that the substance will evaporate from the water surfaces into the atmosphere. Biodegradation in water and sediment or soil is therefore not expected and simulation tests are thus not proposed. Furthermore, biodegradation is unlikely to contribute to the overall degradation in the environment because the substance is gaseous and the primary environmental compartment to which it partition is air and a half-life of 46 hours was obtained for the reaction in air (EPI Suite v4.11, AOPWIN v1.92). It can be concluded that the substance will not persist in air, the most important compartment to which the substance would partition after emission under normal foreseeable conditions of use.

 

Furthermore binding to the solid soil phase (e. g. clay) is not expected due to low the log Koc of < 1.26. In accordance with Annex IX, column 2, 9.2. of Regulation (EC) No. 1907/2006, testing is not required since the chemical safety assessment according to Annex I indicates no need to investigate further the degradation of the substance.