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

Duquesne, S., Newton, L. C., Giusti, L., Marriott, S. B., Stärk, H.-J. and 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). pp. 187-196. ISSN 0269-7491

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Publisher's URL: http://dx.doi.org/10.1016/j.envpol.2005.12.002

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. Heavy-metal contamination in Severn Estuary sediments is declining but shows seasonal variation and depends on location and sediment type.

Item Type:Article
Uncontrolled Keywords:heavy-metal, sediment, grain-size fraction, suspended particulates, contamination
Faculty/Department:Faculty of Health and Applied Sciences > Department of Biological, Biomedical and Analytical Sciences
ID Code:7009
Deposited By: H. Hammond
Deposited On:03 Aug 2010 08:31
Last Modified:12 Aug 2013 07:59

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