||Cosolvent Effects on Sorption and Mobility of Organic Contaminants in Soils.
Wood, A. L. ;
Bouchard, D. C. ;
Brusseau, M. L. ;
Rao, P. S. C. ;
||Florida Univ., Gainesville.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Transport properties ;
Land pollution ;
Ground water ;
Thermodynamic properties ;
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Batch equilibrium and column miscible displacement techniques were used to investigate the influence of an organic cosolvent (methanol) on the sorption and transport of three hydrophobic organic chemicals (HOCs) - naphthalene, phenanthrene, and diuron herbicide - in a sandy surface soil (Eustis fine sand). Equilibrium sorption constant (K) values calculated from batch and column data exhibited an inverse log-linear dependence on the volume fraction (fc) of methanol in the mixed solvent. The slope of the log-linear plot was approximately equal to the logarithm of the ratio of the HOC solubilities in neat cosolvent and water. K values obtained from breakthrough curves were comparable to those estimated from equilibrium sorption isotherms. Long-term exposure to methanol-water mixtures had little effect on sorption and transport properties of the soil, but column retardation factors were influenced by the short-term solvent exposure history prior to solute elution.