| Volatilization | A pKa of 4.90(1) indicates decanoic acid will exist almost entirely in the anion form at pH values of 5 to 9 and therefore volatilization from water surfaces and moist soil is not expected to be an important fate process(2). Decanoic acid is not expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 3.66X10-4 mm Hg(3).
Literature: (1) Barratt MD; Toxicol In Vitro 10:85-94 (1996) (2) Doucette WJ; pp. 141-188 in Handbook of Property Estimation Methods for Chemicals. Boethling RS, Mackay D, eds. Boca Raton, FL: Lewis Publ (2000) (3) Baccanari DP et al; Trans Faraday Soc 64: 1201-5 (1968) |
| Soil Adsorption | The Koc of undissociated decanoic acid is estimated as 4,000 forthe free acid Kow of 4.09(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that undissociated decanoic acid is expected to have slight mobility in soil. The pKa of decanoic acid is 4.90(4), indicating that this compound will exist almost entirely in anion form in the environment and anions generally do not adsorb more strongly to soils containing organic carbon and clay than their neutral counterparts(5).
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. 81 (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: 17-28 (1983) (4) Barratt MD; Toxicol In Vitro 10:85-94 (1996) (5) 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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