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RECORD NUMBER: 7 OF 7

OLS Field Name OLS Field Data
Main Title Sorption and Transport of Hydrophobic Organic Chemicals in Aqueous and Mixed Solvent Systems: Model Development and Preliminary Evaluation.
Author Rao, P. S. C. ; Hornsby, A. G. ; Kilcrease, D. P. ; Nkedi-Kizza, P. ;
CORP Author Florida Univ., Gainesville.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Year Published 1985
Report Number EPA/600/J-85/201;
Stock Number PB86-117363
Additional Subjects Organic compounds ; Mathematical models ; Sorption ; Transport properties ; Environmental surveys ; Water pollution ; Solvents ; Solubility ; Sediments ; Soil analysis ; Reprints ; Land disposal ; Hydrophobic organic chemicals
Holdings
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Status
NTIS  PB86-117363 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 9p
Abstract
A theoretical approach, based upon the assumption of predominance of solvophobic interactions, was formulated to quantitatively describe the sorption and transport of hydrophobic organic chemicals (HOC) from aqueous and aqueous-organic-solvent mixtures. In the theoretical approach, solvent-sorbate interactions (solubility) are specifically considered in order to predict sorbate-sorbent interactions (sorption). For HOC sorption from a single solvent, the HOC sorption coefficient was shown to increase loglinearly with the hydrocarbonaceous surface area (HSA) of the sorbate. For HOC sorption from aqueous-organic binary solvent mixtures, the sorption coefficient is predicted to decrease exponentially as the fraction of organic cosolvent increases. This is a direct consequence of increased HOC solubility in the binary solvent. Because sorption and mobility of HOC are inversely related, a decrease in sorption coefficient leads to an enhanced HOC mobility as the fraction of organic cosolvent is increased. A preliminary verification of the theory was performed by an analysis of published data for (i) HOC sorption by soils and sediments from water, (ii) HOC retention by reversed-phase chromatographic sorbents during isocratic elution with methanol-water binary solvent mixture, and (iii) HOC mobility on soil-TLC plates eluted with ethanol-water mixtures.