Volatilization | The Henry's Law constant for dimethyl ether is estimated as 5.9X10-3 atm-cu m/mole(SRC) from its vapor pressure, 4450 mm Hg(1), and water solubility, 4.6X10+4 mg/l(2). This Henry's Law constant indicates that dimethyl ether is expected to volatilize rapidly from water surfaces(3). Based on this Henry's Law constant, the estimated volatilization half-life from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec)(3) is approximately 2.4 hours(SRC). The estimated volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(3) is approximately 2.8 days(SRC). Dimethyl ether's Henry's Law constant(1,2) indicates that volatilization from moist soil surfaces may occur(SRC). Volatilization of dimethyl ether from dry soil surfaces is expected(SRC) based upon this compound's vapor pressure(1). Literature: (1) Riddick JA et al; Organic Solvents: Physical Properties and Methods of Purification. Techniques of Chemistry. 4th ed. NY, NY: Wiley-Interscience (1986) (2) Hine J, Mookerjee PK; J Org Chem 40: 292-8 (1975) (3)Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 15-1 to 15-29 (1990) |
Soil Adsorption | The Koc of dimethyl ether is estimated as approximately 27(SRC), using a log Kow of 0.10(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that dimethyl ether is expected to have very high mobility in soil(SRC). 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. 5 (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) |
Vapor Pressure | Pressure | Reference |
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4450 mm Hg at 25 deg C | Riddick, J.A., W.B. Bunger, Sakano T.K. Techniques of Chemistry 4th ed., Volume II. Organic Solvents. New York, NY: John Wiley and Sons., 1985., p. 1325 |
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