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Effect of Sewage Sludge on the Adsorption of Polychlorinated Biphenyls by Three New Mexico Soils
Author(s) -
Fairbanks B. C.,
O'Connor G. A.
Publication year - 1984
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1984.00472425001300020024x
Subject(s) - freundlich equation , loam , adsorption , soil water , sewage sludge , chemistry , environmental chemistry , organic matter , sewage , environmental engineering , environmental science , soil science , organic chemistry
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 ( K oc ) were not constant across treatments.