The use of various methods for the study of metal pollution in marine sediments,the case of Euvoikos Gulf,Greece |
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| Affiliation: | 1. Laboratoire Mer Molécules Santé, EA2160, 2 rue de la Houssinière, Université de Nantes, 44322 Nantes Cedex 3, France;2. UMR CNRS 6112 LPG-BIAF, Laboratoire des Bio-Indicateurs Actuels et Fossiles, Université d''Angers, 2 Bd Lavoisier, 49045 Angers Cedex 1, France;3. University of Lisboa, Faculty of Sciences, BioISI – Biosystems & Integrative Sciences Institute, Campo Grande, 1749-016 Lisboa, Portugal;4. UMR CNRS 7266 LIENSs, Institut Littoral Environnement et Sociétés, Université de La Rochelle, La Rochelle, France;1. University of Kentucky, Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, USA;2. University of Michigan, Department of Civil & Environmental Engineering, Ann Arbor, MI 48109, USA;3. University of Kentucky, Department of Earth & Environmental Sciences, Lexington, KY 40506, USA;1. IPMA - Portuguese Institute of Sea and Atmosphere, Rua Alfredo Magalhães Ramalho, 6, 1495-006 Lisbon, Portugal;2. CIIMAR, Marine and Environmental Research Center, Rua dos Bragas, 289, 4050-123 Porto, Portugal;1. Department of Renewable Resources, University of Alberta, 348B South Academic Building, Edmonton, Alberta T6G 2H1, Canada;2. Department of Renewable Resources, University of Alberta, Canada;3. University of Alberta, Augustana Campus, Camrose, Alberta, Canada |
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| Abstract: | This study presents the results on heavy metal (Mn, Fe, Cu, Zn) analyses of sediments taken from Euvoikos Gulf, Greece, which is a semi-enclosed system receiving pollution loads from several urban and industrial sources and is affected by a strong tidal current. A sequential extraction schema and two single-step methods were used for the determination of trace metals. The data of the 1997 period are compared with data from previous studies carried out in the authors' laboratory in the area (1980, 1993) using various analytical techniques, in an attempt to evaluate both the evolution of pollution in the area and the effectiveness of analytical methods. It has been confirmed that a significant part of the pollution load remains in coastal localities in the vicinity of the land based pollution sources, whereas there are also some more remote sites where small polluted particles are transported, deposited and accumulated. The sedimentology regime of the area affects the concentration of metals in a rather complex way depending also on its content of carbonates, organic C and clay minerals. The study of sediment cores has indicated elevated metal concentrations in recent surface sediments. On the other hand, some environmentally positive trends were also observed (i.e. the reduction of mobile metals). A systematic monitoring is needed in the marine environment coupled with some reduction in pollution inputs and integrated management on the coastal zone because the overall hydrological characteristics of the area favour its rapid self-restoration. |
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