The Henry's Law constant for 1-octene is estimated as 0.627 atm-cu m/mole(SRC) from its vapor pressure, 17.4 mm Hg(1), and water solubility, 4.1 mg/l(2). This Henry's Law constant indicates that 1-octene is expected to volatilize rapidly from water surfaces(3). 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)(3) is estimated as 3.1 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)(3) is estimated as 4.2 days(SRC). The volatilization half-life from a model pond 2 m deep is estimated to be 37 hrs ignoring adsorption; when considering maximum adsorption, the volatilization half-life increases to 95 hrs(4). 1-Octene's estimated Henry's Law constant(1,2) indicates that volatilization from moist soil surfaces may occur(SRC). The potential for volatilization of 1-octene from dry soil surfaces may exist(SRC) based upon a vapor pressure of 17.4 mm Hg(1).
Literature: (1) Yaws CL; Handbook of Vapor Pressures, Vol 3, C8 to C28 Compound. Houston, TX: Gulf Publ Co. pp. 382-7 (1994) (2) Yalkowsky SH, Dannenfelser RM; Aquasol Data Base of Water Solubility Ver 5, Tuscon, AZ: Univ Arizona, College of Pharmacy (1992) (3) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 15-1 to 15-29 (1990) (4) US EPA; EXAMS II Computer Simulation (1987)
Using a structure estimation method based on molecular connectivity indices(1), the Koc for 1-octene can be estimated to be 510(SRC). According to a classification scheme(2), this estimated Koc value suggests that 1-octene is expected to have a low to moderate mobility in soil.
Literature: (1) Meylan WM et al; Environ Sci Technol 26: 1560-67 (1992) (2) Swann RL et al; Res Rev 85: 17-28 (1983)