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This article in JEQ

  1. Vol. 13 No. 2, p. 297-300
    Received: Mar 24, 1983

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Effect of Sewage Sludge on the Adsorption of Polychlorinated Biphenyls by Three New Mexico Soils1

  1. B. C. Fairbanks and
  2. G. A. O'Connor2



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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