Trifluoromethane

CAS RN:75-46-7

Volatilization

The Henry's Law constant for trifluoromethane is 0.0952 atm-cu m/mole(1). This Henry's Law constant indicates that trifluoromethane is expected to volatilize rapidly from water surfaces(2). Based on this Henry's Law constant, the volatilization half-life from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec)(2) is estimated as 2.5 hours(SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(2) is estimated as 3.3 days(SRC). Trifluoromethane's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). Trifluoromethane is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 35,300 mm Hg(3).
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