JEQ Journal of Natural Resources and Life Sciences Education
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Published in J Environ Qual 13:297-300 (1984)
© 1984 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Sewage Sludge on the Adsorption of Polychlorinated Biphenyls by Three New Mexico Soils1

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

ABSTRACT

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.

Key Words: toxic organic sorption • chlorinated hydrocarbon sorption • PCB retention • Koc • Freundlich equation

NOTES

1 Journal article 999, Agric. Exp. Stn., New Mexico State Univ., Las Cruces, NM 88003. This study was supported by funds from the Dep. of Energy under contract no. DE-AC04-76ET 33626.

2 Research Specialist and Professor, respectively, Dep. of Crop and Soil Sci., New Mexico State Univ.

Received for publication March 24, 1983.




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