2-Xylene

CAS RN: 95-47-6

Volatilization

The Henry's Law constant for 2-xylene has been measured as 5.18X10-3 atm-cu m/mole(1). This Henry's Law constant indicates that 2-xylene 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 3.2 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 4.1 days(SRC). 2-Xylene's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). 2-Xylene is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 6.65 mm Hg at 25 deg C(3).
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