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INFLUENCE OF MACROMOLECULES ON CHEMICAL TRANSPORT
Citation:
Enfield*, C G., G. Bengtsson, AND R. Lindquist. INFLUENCE OF MACROMOLECULES ON CHEMICAL TRANSPORT. ENVIRONMENTAL SCIENCE & TECHNOLOGY 23(10):1278-1286, (1989).
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Description:
Macromolecules in the pore fluid influence the mobility of hydrophobic compounds through soils. his study evaluated the significance of macromolecules in facilitating chemical transport under laboratory conditions. Partition coefficients between 14C-labeled hexachlorobenzene and three macromolecules [dextran, humic acid, and roundwater dissolved oranic carbon (DOC)] were determined in a three-phase (water-macromolecule-soil) system. There were significant differences between the macromolecule: water partition coefficients, which ranged from 1 x 103 to 1 x 106. oil:water partitioning for humic acid was demonstratod by using column breakthrough curves where the breakthrough curve for humic acid was retarded behind 3H2). reakthrough curves for dextran and groundwater DOC demonstrated apparent exclusion, as these compounds eluted from the soil column before the 3H2). he impact of the dextran was demonstrated under dynamic by use of hexachlorobenzene, anthracene, and with and without macromolecules in replicated, biologically inhibited (sodium azide), saturated soil columns. The results may help explain the mechanism by which hydrophobic pollutants appear in deep groundwater aquifers.
