Methanol

CAS RN: 67-56-1

Volatilization

The measured Henry's Law constant for methanol at 25 deg C is 4.55X10-6 atm-cu m/mole(1). This Henry's Law constant indicates that methanol 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 4.6 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 35 days(SRC). Methanol's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). The potential for volatilization of methanol from dry soil surfaces may exist(SRC) based upon a vapor pressure of 127 mm Hg(3).
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