| Volatilization | The Henry's Law constant for eicosane is estimated as 90 atm-cu m/mole(SRC), using a fragment constant estimation method(1). This Henry's Law constant indicates that eicosane may volatilize 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)(3) is estimated as 1.7 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 6.7 days(SRC). However, adsorption to soil is expected to attenuate volatilization(SRC). The estimated volatilization half-life from a model pond is greater than 2 years if adsorption is considered(4). Eicosane is not expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure of 4.62X10-6 mm Hg at 25 deg C(5).
Literature: (1) Meylan WM, Howard PH; Environ Toxicol Chem 10: 1283-93 (1991) (2) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 15-1 to 15-29 (1990) (3) US EPA; Estimation Program Interface (EPI) Suite. Ver. 4.1. Nov, 2012. Available from, as of Nov 17, 2016: http://www2.epa.gov/tsca-screening-tools (4) US EPA; EXAMS II Computer Simulation (1987) (5) Zwolinski BJ, Wilhoit RC; Handbook of Vapor Pressures and Heats of Vaporization of Hydrocarbons and related compounds. API44-TRC101. College Station,TX: Thermodynamcs Research Center (1971) |
| Soil Adsorption | The Koc of eicosane is estimated as 5.9X10+5(SRC), using an estimated log Kow of 10.16(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that eicosane is expected to be immobile in soil.
Literature: (1) US EPA; Estimation Program Interface (EPI) Suite. Ver. 4.1. Nov, 2012. Available from, as of Nov 15, 2016: http://www2.epa.gov/tsca-screening-tools (2) Swann RL et al; Res Rev 85: 17-28 (1983) |
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