| Volatilization | The pKa of hexanoic acid is 4.88(1), indicating that this compound will exist predominantly as an anion under environmental conditions. Volatilization will not occur from water and moist soils since anions do not volatilize(SRC). Hexanoic acid is not expected to volatilize from dry soil surfaces(SRC), based upon an extrapolated vapor pressure of 0.0435 mm Hg at 25 deg C(2).
Literature: (1) Riddick, JA et al;. Techniques of Chemistry 4th ed Volume II. Organic Solvents. New York, NY: John Wiley and Sons, pp 372 (1985)(2) Daubert TE, Danner RP; Physical & Thermodynamic Properties of Pure Chemicals: Data Compilation, NY: Hemisphere Pub Corp (1989) |
| Soil Adsorption | Koc values of 26, 24 and 37 have been experimentally measured, for an acidic forest soil (pH 2.8, 4.85% organic carbon), agricultural soil (pH 6.7, 1.25% organic carbon), and a lake sediment (pH 7.1, 1.58% organic carbon), respectively(1). According to a classification scheme(2), these measured Koc values suggest that hexanoic acid is very highly mobile in soil(SRC). In addition, the pKa of hexanoic acid is 4.88(3), indicating that this compound will primarily exist as an anion in the environment, and anions generally possess high mobility in soil(4).
Literature: (1) Von Oepen B et al; Chemosphere 22: 285-304 (1991) (2) Swann RL et al; Res Rev 85: 23 (1983) (3) Riddick, JA et al;. Techniques of Chemistry 4th ed Volume II. Organic Solvents. New York, NY: John Wiley and Sons, pp 372 (1985) (4) Doucette WJ; pp. 141-188 in Handbook of Property Estimation Methods for Chemicals. Boethling RS, Mackay D, eds. Boca Raton, FL: Lewis Publ (2000) |
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