CAS RN: 8006-64-2


Turpentine typically contains alpha-pinene (59%), beta-pinene (24%) and other isomeric terpenes(1). The Henry's Law constant for alpha- and beta-pinene have been measured as 0.134 and 0.0679 atm-cu m/mole respectively at 25 deg C(2). These Henry's Law constants indicate that alpha- and beta-pinene are expected to volatilize rapidly from water surfaces(3). Based on these Henry's Law constants, 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 3.4 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 4.6 days(SRC). alpha- and beta-Pinene's Henry's Law constants indicate that volatilization from moist soil surfaces may occur(SRC). alpha- and beta-Pinene are expected to volatilize from dry soil surfaces(SRC) based upon respective vapor pressures of 4.75 and 2.93 mm Hg at 25 deg C(1).
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