1,1-Dichloroethane

CAS RN:75-34-3

Volatilization

The Henry's Law constant for 1,1-dichloroethane is 5.62X10-3 atm-cu m/mole at 24 deg C(1). This Henry's Law constant indicates that 1,1-dichloroethane is expected to volatilize rapidly 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 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 days(SRC). 1,1-Dichloroethane's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). 1,1-Dichloroethane is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 227 mm Hg(3). Three values of the overall liquid transfer coefficient of 1,1-dichlorethane from water relative to oxygen are 0.55(4), 0.62(5), and 0.71(6).
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