The Henry's Law constant for benzyl cyanide is estimated as 1.4X10-4 atm-cu m/mole(SRC) derived from its vapor pressure, 8.9X10-2 mm Hg(1), and water solubility, 100 mg/L(2). This Henry's Law constant indicates that benzyl cyanide is expected to volatilize 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 5.7 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 6.4 days(SRC). Benzyl cyanide's estimated Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). Benzyl cyanide is not expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(1).
Literature: (1) O'Neil MJ, ed; The Merck Index. 13th ed Whitehouse Station, NJ: Merck and Co., Inc., p.194 (2001) (2) Chemicals Inspection and Testing Institute; Biodegradation and bioaccumulation data of existing chemicals based on the CSCL Japan. Japan Chemical Industry Ecology - Toxicology and Information Center. ISBN 4-89074-101-1 (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 benzyl cyanide is estimated as 170(SRC), using a log Kow of 1.56(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that benzyl cyanide is expected to have moderate mobility in soil.
Literature: (1) Hansch C et al; Exploring QSAR. Hydrophobic, Electronic, and Steric Constants. ACS Prof Ref Book. Heller SR, consult. ed., Washington, DC: Amer Chem Soc p. 39 (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: 17-28 (1983)
|0.089 mm Hg at 25 deg C /Extrapolated/||O'Neil, M.J. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. 13th Edition, Whitehouse Station, NJ: Merck and Co., Inc., 2001., p. 194|