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RECORD NUMBER: 21 OF 174

OLS Field Name OLS Field Data
Main Title Biosorption of Dichlorodiphenyltrichloroethane and Hexachlorobenzene in Groundwater and Its Implications for Facilitated Transport.
Author Lindqvist, R. ; Enfield, C. G. ;
CORP Author Lund Univ. (Sweden). Dept. of Ecology. ;Rice Univ., Houston, TX. Dept. of Environmental Science and Engineering.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1992
Year Published 1992
Report Number EPA-R-812808; EPA/600/J-92/452;
Stock Number PB93-141497
Additional Subjects Chemical water pollutants ; Hexachlorobenzene ; DDT ; Ground water ; Soil microbiology ; Sewage ; Microbial colony count ; Bacillus ; Liquid chromatography ; Mathematical models ; Reprints ; Chemical transport
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB93-141497 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/12/1993
Collation 10p
Abstract
The potential for enhanced mobility of hydrophobic pollutants by cotransport with bacteria in saturated soils was evaluated from measurements of biosorption of (14)C-labeled hexachlorobenzene and dichlorodiphenyl-trichloroethane (DDT) to five strains of soil and sewage bacteria. The sorption process could be described by a linear partition equation and appeared to be reversible, but desorption kinetics were slow and/or partly irreversible. The DDT partition coefficients varied with equilibration time, possibly reflecting DDT-induced changes in the physiology of the bacteria. The partition coefficients, normalized to the masses of the bacteria, ranged from 250 to 14,000 for live cells, but the largest coefficients were associated with autoclaved cells of a Pseudomonas sp. The sorptive capacity of the bacterial biomass was greater for DDT than for hexachlorobenzene but was not correlated to overall bacterial hydrophobicity, measured by hydrophobic interaction chromatography. In a column study, 1.2 X 10(9) cells of a Bacillus sp. strain per ml enhanced DDT transport about 8-fold, whereas an advective-dispersive-sorptive equilibrium model for two mobile phases, water and free-living bacteria, suggested a 14-fold enhancement, based on the DDT partition coefficient. The disagreement was in part due to a retarded nonequilibrium movement of the bacteria. (Copyright (c) 1992, American Society for Microbiology.)