Effect of Sewage Sludge on the Adsorption of Polychlorinated Biphenyls by Three New Mexico Soils
1984
Fairbanks, B. C. | O'Connor, G. A.
The adsorption of polychlorinated biphenyls (PCB's) (54% CI) by three low-organic matter New Mexico soils amended with sewage sludge was determined by batch equilibration. Adsorption isotherm data were described by the Freundlich equation. An increase in adsorption with increased organic C content was observed. However, for a given organic C content, adsorption in soils preconditioned with sewage sludge differed from soils amended with sludge at the time of adsorption analysis. Adsorption was greater in a clay soil than in two sandy loams. Differences in organic C content described 56.5% of the variance in the Freundlich K constants for PCB retention across all treatments. Incorporating the factor of clay content or specific surface area into the regression analysis accounted for 79.1% of the variance in K. Freundlich constants normalized for organic C content (Kₒc) were not constant across treatments.
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