Acetaldehyde

The Henry's Law constant for acetaldehyde is 6.67X10-5 atm-cu m/mole(1). This Henry's Law constant indicates that acetaldehyde 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 11 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 5.3 days(SRC). Acetaldehyde's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). Acetaldehyde is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 902 mm Hg(3).