1,4-Dioxane

CAS RN: 123-91-1

Volatilization

The Henry's Law constant for 1,4-dioxane is 4.8X10-6 atm-cu m/mole(1). This Henry's Law constant indicates that 1,4-dioxane 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 7.3 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 56 days(SRC). 1,4-Dioxane's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). 1,4-Dioxane is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 38.1 mm Hg(3).
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