Chloroform

CAS RN: 67-66-3

Volatilization

The Henry's Law constant for chloroform is 3.67X10-3 atm-cu m/mole(1). This Henry's Law constant indicates that chloroform 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 3.5 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 4.4 days(SRC). Three laboratory studies of the evaporation of chloroform from water gave half-lives of 3-5.6 hours with moderate mixing conditions(3-5). Chloroform volatilization constants were estimated in chilled (4 deg C) and boiled (100 deg C) water to be 0.88/hour and 1.50/hour, respectively(6). Estimated volatilization constants in experiments at 25 and 30 deg C ranged from 0.055/hour to 0.411/hour depending on the width and liquid level in the glass(6). Chloroform's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). Chloroform is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 197 mm Hg(7).
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