Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

2 -Bromo-3,3,3-trifluoropropene was found not to be readily biodegradable in a screening study in water, and was found to be hydrolytically stable in a hydrolysis test at pH 4, 7, and 9; on this basis the substance is not anticipated to degrade rapidly by either biotic or abiotic routes in the environment.

The experimentally derived soil adsorption coefficient (log10Koc) was 2.2.

It should be noted that although the 2-bromo-3,3,3-trifluoropropene is not expected to degrade rapidly, it is unlikely that it will persist in the aquatic environment; the Henry's law constant (H) was calculated to be 14350 Pa.m^3/mol (this calculation was included in Huntingdon life Sciences study WAG0019, 2013; please refer to dossier section 6.1.1 for details). As H is greater than 100 Pa.m^3/mol, more than 50% of the substance would be expected to be lost from the water phase in between 3 and 4 hours. The substance would therefore not be expected to remain in the water phase for long, but rather would be expected to rapidly volatilise and partition into air.

With reference to modelling data published in the Journal of Geophysical Research (volume 116, 2011 - please refer to report included in dossier section 13), 2-bromo-3,3,3-trifluoropropene is expected to react quickly with gas-phase OH radicals in the atmosphere and as such will have a short atmospheric lifetime (7.0 days at latitudes 30°N to 60°N). On the basis of the anticipated rapid partitioning to the atmospheric compartment followed by degradation it is considered that BTP will not persist in the environment.