Ethanol

CAS RN: 64-17-5

Volatilization

The Henry's Law constant for ethanol is 5.0X10-6 atm-cu m/mole(1). This Henry's Law constant indicates that ethanol is expected to volatilize 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 5 days(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 39 days(SRC). Ethanol's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). Ethanol is expected to volatilize from dry soil surfaces(SRC) based upon an extrapolated vapor pressure of 59.3 mm Hg(3).
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