Record Display for the EPA National Library Catalog


Main Title Sorption of Hydrophobic Organic Compounds by Sediments.
Author Curtis, G. P. ; Reinhard, M. ; Roberts, P. V. ;
CORP Author Stanford Univ., CA. Dept. of Civil Engineering.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Year Published 1986
Report Number EPA-R-812462; EPA/600/D-87-049;
Stock Number PB87-145538
Additional Subjects Sorption ; Sediments ; Water ; Contaminants ; Organic compounds ; Solubility ; Mathematical models ; Reprints ; Fate of pollutants
Library Call Number Additional Info Location Last
NTIS  PB87-145538 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 16p
Thermodynamic and kinetic principles which govern the uptake of nonionic, hydrophobic organic chemicals by sediments in aqueous systems are summarized. Sorption onto organic-rich sediments can be modeled as a process where the hydrophobic compound partitions into the organic matter associated with the sediments analogous to the partitioning in the octanol water system resulting in a linear free energy relationship between the two partition coefficients. The influence of dissolved organic matter can be accounted for by considering a binding isotherm between the hydrophobic solute and dissolved macromolecules. Adsorption at the mineral-water interface becomes important when the adsorbate contains polar functional groups and/or when the adsorbate contains quite small concentrations of organic matter. Sorption can require more than a month to reach equilibrium for highly hydrophobic compounds, but can be adequately described by a radial diffusion model accompanied by the retarding influence of sorption.