Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

HFO-1234ze is phototransformed in the air with ~ 100% degradation observed by 14 days. Based on structure activity analysis, HFO-1234ze would not be expected to hydrolyze in water. HFO-1234ze is expected to be stable in water.

The OH initiated oxidation of trans-CF3CH=CHF gives CF3CHO and HC(O)F in yields of approximately 100%. CF3CHO is removed from the atmosphere via photolysis and, to lesser extents, reaction with OH radicals and addition of water to give the hydrate. Photolysis gives CF3 and 5 HCO radicals while reaction with OH gives CF3CO radicals. CF3 radicals will add O2 to give CF3O2 radicals which are then converted into COF2 which hydrolyzes to give CO2 and HF. CF3CO radicals will add O2 to give CF3C(O)O2 radicals, the majority of which will be converted into COF2, with a small fraction converted into CF3C(O)OH via reaction with 10 HO2 radicals. The hydrate, CF3CH(OH)2 is lost via reaction with OH radicals to give CF3C(O)OH. The available data suggest that while CF3C(O)OH is not a natural component of the freshwater environment, it is a natural component of the background oceanic environment, and any additional burden associated with trans-CF3CH=CHF oxidation will be of negligible environmental significance.

HFO-1234ze has low global warming potential (GWP=6) and will not deplete the ozone (ozone depleting potential = 0).