Chlorotrifluoromethane

CAS RN: 75-72-9

Volatilization

The Henry's Law constant for chlorotrifluoromethane was measured as 1.38 atm-cu m/mole(1). This value indicates that chlorotrifluoromethane will volatilize rapidly from water surfaces(2,SRC). 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) is estimated as approximately 3 hours(2,SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec) is estimated as approximately 97 hours(2,SRC). Chlorotrifluoromethane's Henry's Law constant(1) indicates that volatilization from moist soil surfaces is expected to occur(SRC). Chlorotrifluoromethane is expected to volatilize rapidly from dry soil surfaces based on the measured vapor pressure of 2.14X10+4 mm Hg at 25 deg C(3).
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