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The persistence of polychlorinated biphenyls (PCBs) in sewage sludge amended agricultural soils.

Alcock, Ruth E. and Bacon, J. R. and Bardget, R. D. and Beck, A. J. and Haygarth, P. M. and Lee, R. G. M. and Parker, C. A. and Jones, Kevin C. (1996) The persistence of polychlorinated biphenyls (PCBs) in sewage sludge amended agricultural soils. Environmental Pollution, 93 (1). pp. 83-92. ISSN 0269-7491

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Abstract

Four metal enriched sewage sludges containing different concentrations of polychlorinated biphenyls (PCBs) were applied to two field soils in the UK in 1968. Samples of the sludges, sludge-amended soils and soils from untreated control plots were stored and analysed retrospectively. Sludge concentrations ranged from 1 to 7 mg ∑PCB kg−1. The pattern of PCBs was similar in three of the four sludges, with congeners 14, 18, 28 and 52 present at the highest concentrations. The fourth sludge contained higher amounts of congeners 149, 153, 138 and 180. ∑PCB concentrations in control plot soil have declined over the last 20 years, indicating a reduction in atmospheric deposition inputs of PCBs to the soil. ∑PCB concentrations also declined on the sludge-amended plots, reaching control plot concentrations (30–60 μg ∑PCB kg−1) in the late-1980s. Half-lives ranged from < 1 to 8.5 years for congeners 18, 28 and ∑PCB. Biodegradation and/or the formation of reversibly sorbed soil PCB residues could not account for the losses observed. Volatilisation is implicated as the most important loss process on both the control and sludge-amended plots. Using the fugacity approach, congener concentrations in soils at Luddington were predicted still to have not reached equilibrium with the air. Further losses to the atmosphere are likely.

Item Type: Article
Journal or Publication Title: Environmental Pollution
Uncontrolled Keywords: PCB ; sewage sludge ; soil
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
Faculty of Arts & Social Sciences > Politics & International Relations (Merged into PPR 2010-08-01)
ID Code: 21984
Deposited By: ep_ss_importer
Deposited On: 16 Feb 2009 16:57
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:54
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21984

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