The Henry's Law constant for thiophene is estimated as 2.9X10-3 atm-cu m/mole(SRC) from its experimental value for vapor pressure, 79.7 mm Hg(1), and experimental water solubility, 3,020 mg/l(2). This value indicates that thiophene will volatilize from water surfaces(3,SRC). 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) is estimated as approximately 3 hours(3,SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec) is estimated as approximately 89 hours(3,SRC). Thiophene's Henry's Law constant(SRC) and vapor pressure indicates that volatilization from moist and dry soil surfaces is important(SRC).
Literature: (1) Boublik et al; The Vapor Pressures of Pure Substances: Selected Values of the Temperature Dependence of the Vapor Pressures of Some Pure Substances in the Normal and Low Temperature Region. Vol 17. Amsterdam, Netherlands: Elsevier Sci Publ (1984) (2) Yalkowsky SH, Dannenfelser RM; Aquasol Database of Aqueous Solubility Ver 5. Univ Ariz Tucson AR (1992) (3) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington DC: Amer Chem Soc pp. 15-1 to 15-29 (1990)
The Koc of thiophene is estimated as approximately 230(SRC), using a measured log Kow of 1.81(1) and a regression-derived equation(2,SRC). According to a recommended classification scheme(3), this estimated Koc value suggests that thiophene is expected to have moderate mobility in soil(SRC).
Literature: (1) Hansch C et al; Exploring QSAR Hydrophobic, Electronic and Stearic Constants Washington DC: Amer Chem Soc (1995) (2) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington DC: Amer Chem Soc pp. 4-9 (1990) (3) Swann RL et al; Res Rev 85: 23 (1983)
|79.7 mm Hg @ 25 deg C||Boublik, T., Fried, V., and Hala, E., The Vapour Pressures of Pure Substances. Second Revised Edition. Amsterdam: Elsevier, 1984.|