| Volatilization | The Henry's Law constant for dodecane is estimated as 8.2 atm-cu m/mole(SRC) derived from its vapor pressure, 0.135 mm Hg(1), and water solubility, 3.7X10-3 mg/L(2). This Henry's Law constant indicates that dodecane 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 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)(3) is estimated as 5 days(SRC). However, volatilization from water surfaces is expected to be attenuated by adsorption to suspended solids and sediment in the water column. The estimated volatilization half-life from a model pond is 32 days if adsorption is considered(4). Dodecane's estimated Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). Dodecane is not expected to volatilize from dry soil surfaces(SRC) based upon its vapor pressure(1).
Literature: (1) Kertes AS; Hydrocarbons with Water and Seawater Part II. Hydrocarbons C8 to C31. Solubility Data Series Vol 38. Shaw PC, ed., London, UK: Pergamon Press, 553 pp (1989) (2) Daubert TE, Danner RP; Physical and Thermodynamic Properties of Pure Chemicals: Data Compilation. Design Inst Phys Prop Data, Amer Inst Chem Eng. New York, NY: Hemisphere Pub Corp 5 Vol (1994) (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) |
| Soil Adsorption | Using a structure estimation method based on molecular connectivity indices(1), the Koc of dodecane can be estimated to be 4800(SRC). According to a classification scheme(2), this estimated Koc value suggests that dodecane is expected to have slight mobility in soil. In a study conducted to mimic a spill of 1.27 L/sq m, dodecane (present in JP-4 jet fuel) was transported to a depth of 10 cm; at the end of the study (134 days), it was no longer detected(3). In another study, it was determined that dodecane is slowly intercalated into well dried montmorillonite clay(4).
Literature: (1) US EPA; Estimation Program Interface (EPI) Suite. Ver. 4.1. Nov, 2012. Available from, as of Aug 25, 2016: http://www2.epa.gov/tsca-screening-tools (2) Swann RL et al; Res Rev 85: 17-28 (1983) (3) Ross WD et al; Environmental Fate and Biological Consequences of Chemicals Related to Air Force Activities. NTIS AD-A121 288/5. Dayton, OH: Monsanto Res Corp. pp. 173 (1982) (4) Eltantawy IM, Arnold PW; Nature (London) Phys Sci 237: 123-25 (1972) |
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