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Bioavailability of persistent organic pollutants in soils and sediments - a perspective on mechanisms, consequences and assessment.

Reid, Brian J. and Jones, Kevin C. and Semple, Kirk T. (2000) Bioavailability of persistent organic pollutants in soils and sediments - a perspective on mechanisms, consequences and assessment. Environmental Pollution, 108 (1). pp. 103-112. ISSN 0269-7491

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Abstract

It has been observed that as soil-pollutant contact time increases, pollutant bioavailability and extractability decreases. This phenomenon has been termed `ageing'. Decreased chemical extractability with increased soil-chemical contact time is evident where both `harsh' techniques, e.g. dichloromethane Soxhlet extraction, and `non-exhaustive' techniques, e.g. butanol shake extraction, have been used. It has also been observed that the amount of chemical extracted by these techniques varies considerably over time. Similarly, decreases in bioavailability with increased soil-pollutant contact time have been described in bacterial, earthworm and other organism studies. From these investigations, it has been shown that the fraction of pollutant determined to be bioavailable can vary between organisms. Thus, there is an immediate definition problem, what is bioavailability? Additionally, if bioavailability is to be assessed by a chemical means, which organisms should (or can) be mimicked by the extraction procedure? This review provides a background to the processes inherent to ageing, a discussion of its consequences on bioavailability and ends with some reflections on the appropriateness of chemical extraction techniques to mimic bioavailability (C) 2000 Elsevier Science Ltd. All rights reserved.

Item Type: Article
Journal or Publication Title: Environmental Pollution
Uncontrolled Keywords: persistent organic pollutants ; bioavailability ; soils ; sediments
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 18587
Deposited By: Prof Kirk T. Semple
Deposited On: 24 Oct 2008 16:32
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:19
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/18587

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