| Volatilization | The Henry's Law constant for ethyl mercaptan is 4.53X10-3 atm-cu m/mole(1). This Henry's Law constant indicates that ethyl mercaptan is expected to 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)(2) is estimated as 2.4 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)(2) is estimated as 3.2 days(SRC). Ethyl mercaptan's Henry's Law constant indicates that volatilization from moist soil surfaces may occur(SRC). Ethyl mercaptan is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 529 mm Hg(3).
Literature: (1) Vitenberg AG et al; J Chromat 112: 319-27 (1975) (2) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 15-1 to 15-29 (1990) (3) Daubert TE, Danner RP; Physical and Thermodynamic Properties of Pure Chemicals: Data Compilation. Design Inst Phys Prop Data, Amer Inst Chem Eng. NY, NY: Hemisphere Pub Corp. 4 vol (1989) |
| Soil Adsorption | The Koc of ethyl mercaptan is estimated as 22(SRC), using a water solubility of 1.56X10+4 mg/L(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that ethyl mercaptan is expected to have very high mobility in soil.
Literature: (1) Wakita K et al; Chem Pharm Bull 34: 4463-81 (1986) (2) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 4-5 (1990) (3) Swann RL et al; Res Rev 85: 17-28 (1983) |
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