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Evidence for declining levels of heavy-metals in the Severn Estuary and Bristol Channel, U.K. and their spatial distribution in sediments

Duquesne, Sabine; Newton, Lyn C.; Giusti, Lorenzo; Marriott, Susan B.; Stärk, Hans Joachim; Bird, David J.

Authors

Sabine Duquesne

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Lynda Newton Lyn.Newton@uwe.ac.uk
Head of Department of Applied Sciences

Lorenzo Giusti lorenzo.giusti@uwe.ac.uk

Susan B. Marriott

Hans Joachim Stärk

David J. Bird david.bird@uwe.ac.uk



Abstract

Levels of heavy-metals (Cd, Cu, Cr, Ni, Pb and Zn) in suspended particulate and in surface and subsurface sediments were determined at seven locations in the Severn Estuary and Bristol Channel. Sediment metal concentrations were highest at sites close to industrial centres but levels have decreased significantly over the last 30 years so that they are now close to, or meet, environmental quality guidelines. The greatest metal concentrations in deposited sediments were usually associated with the finest particulates at locations with muddy sediments, but this was not always true at sites with predominantly sandy sediments. The metals bound to suspended particulates at all sites were remarkably consistent, presumably reflecting the mixing capacity of this macro-tidal estuary. The re-exposure of older, more contaminated sediments could explain the observed differences between deposited and suspended material. Sediment redistribution due to strong seasonal currents might also explain the differences between winter and summer samples. © 2005 Elsevier Ltd. All rights reserved.

Citation

Duquesne, S., Newton, L. C., Giusti, L., Marriott, S. B., Stärk, H. J., & Bird, D. J. (2006). Evidence for declining levels of heavy-metals in the Severn Estuary and Bristol Channel, U.K. and their spatial distribution in sediments. Environmental Pollution, 143(2), 187-196. https://doi.org/10.1016/j.envpol.2005.12.002

Journal Article Type Article
Publication Date Sep 1, 2006
Journal Environmental Pollution
Print ISSN 0269-7491
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 143
Issue 2
Pages 187-196
DOI https://doi.org/10.1016/j.envpol.2005.12.002
Keywords heavy-metal, sediment, grain-size fraction, suspended particulates, contamination
Public URL https://uwe-repository.worktribe.com/output/1043633
Publisher URL http://dx.doi.org/10.1016/j.envpol.2005.12.002