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Environmental fate & pathways

Phototransformation in air

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Description of key information

DT50 = 6.2 days calculated using EQUATION R.16-18, kdegair = 0.11 d-1

Key value for chemical safety assessment

Half-life in air:
6.2 d

Additional information

The first order rate constant of 6.2 days for degradation in air was calculated using EQUATION R.16-18, KDEGAIR = kOH • OHCONCAIR • 24 • 3600 where the kOH = specific degradation rate constant with OH-radicals 2.6E-12 cm3.molec-1.s-1(Acerboni, et al., 2001) and OHCONCair = concentration of OH-radicals in atmosphere = 5E5 Atmospheric oxidation in laboratory studies resulted in the formation of carbonyl fluoride and trifluoroacetyl fluoride. These degradates are incorporated into raindrops/aerosols in the atmosphere and in the water phase degraded to trifluoroacetic acid, hydrogen fluoride, and carbon dioxide (Acerboni et al.,2001)