Record Display for the EPA National Library Catalog

RECORD NUMBER: 20 OF 38

OLS Field Name OLS Field Data
Main Title Macromolecules Facilitate the Transport of Trace Organics.
Author Bengtsson, G. ; Enfield, C. G. ; Lindqvist, R. ;
CORP Author Lund Univ. (Sweden). Lab. of Ecological Chemistry.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Year Published 1987
Report Number EPA/600/J-87/354;
Stock Number PB88-220108
Additional Subjects Organic compounds ; Contaminants ; Transport properties ; Soils ; Reprints ; Environmental transport
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB88-220108 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 12/29/1988
Collation 8p
Abstract
Macromolecules in the pore fluid of a soil may influence the mobility of hydrophobic compounds by their partitioning to the macromolecule, which moves with, or even faster than, the water. The mobility is described mathematically by a chemical transport model. The significance of the model was demonstrated experimentally in a ground-water infiltration microcosm using dextran, a polysaccharide, as the macromolecule added to lake water pumped through soil columns. Breakthrough curves showed that 500mg/l of dextran enhanced the mobility of hexachlorobenzene by approximately 25 percent. With more hydrophobic macromolecules, such as humic acids, the theory predicts a significantly larger mobility enhancement, a phenomenon that may explain the presence of very hydrophobic pollutants in deep ground-water aquifers.