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Spatial distribution of trace elements in the surface sediments of a major European estuary (Loire Estuary, France): Source identification and evaluation of anthropogenic contribution

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCOYNEL, Alexandra
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorGORSE, Laureline
hal.structure.identifierLIttoral ENvironnement et Sociétés [LIENSs]
dc.contributor.authorCURTI, Cécile
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSCHAFER, Jorg
hal.structure.identifierGéoHydrosystèmes COntinentaux [GéHCO EA6293]
dc.contributor.authorGROSBOIS, Cécile
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMORELLI, Guia
dc.contributor.authorDUCASSOU, Emmanuelle
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorBLANC, Gerard
hal.structure.identifierLaboratoire de Planétologie et Géodynamique - Angers [LPG-ANGERS]
dc.contributor.authorMAILLET, Grégoire
hal.structure.identifierLaboratoire de Planétologie et Géodynamique - Angers [LPG-ANGERS]
dc.contributor.authorMOJTAHID, Meryem
dc.date.accessioned2024-04-03T15:25:06Z
dc.date.available2024-04-03T15:25:06Z
dc.date.issued2016-12
dc.identifier.issn1385-1101en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/189174
dc.description.abstractEnAssessing the extent of metal contamination in estuarine surface sediments is hampered by the high heterogeneity of sediment characteristics, the spatial variability of trace element sources, sedimentary dynamics and geochemical processes in addition to the need of accurate reference values for deciphering natural to anthropogenic contribution. Based on 285 surface sediment samples from the Loire Estuary, the first high-resolution spatial distributions are presented for grain-size, particulate organic carbon (POC) and the eight metals/metalloids identified as priority contaminants (Cd, Zn, Pb, Cu, As, Cr, Ni, Hg) plus Ag (an urban tracer). Grain-size and/or POC are major factors controlling the spatial distribution of trace element concentrations. The V-normalized trace metal concentrations divided by the V-normalized concentrations in the basin geochemical background showed the highest Enrichment Factors for Ag and Hg (EF; up to 34 and 140, respectively). These results suggest a severe contamination in the Loire Estuary for both elements. Intra-estuarine Ag and Hg anomalies were identified by comparison between respective normalized concentrations in the Loire Estuary surface sediments and those measured in the surface sediments at the outlet of the Loire River System (watershed-derived). Anthropogenic intra-estuarine Ag and Hg stocks in the uppermost centimetre of the sediment compared with rough annual fluvial flux estimates suggest that the overall strong Enrichment Factors for Ag (EFAg) and and Hg (EFHg) in the Loire Estuary sediments are mainly due to watershed-derived inputs, highlighting the need of high temporal hydro-geochemical monitoring to establish reliable incoming fluxes. Significant correlations obtained between EFCd and EFAg, EFCu and POC and EFHg and POC revealed common behavior and/or sources. Comparison of trace element concentrations with ecotoxicological indices (Sediment Quality Guidelines) provides first standardized information on the sediment quality in the Loire Estuary. The overall mean Effect Range Median quotients (m-ERM-q) results suggested that the Loire Estuary is mainly characterized by slightly toxic sediments even if ecotoxicological impacts have been previously reported on biota.
dc.description.sponsorshipPour une gestion intégrée et durable des ressources en eau de bassins soumis à des pollutions industrielles et urbaines: étude comparative du Lot (France) et du Danshuei (Taiwan) - ANR-11-IS56-0003en_US
dc.language.isoENen_US
dc.subject.enEnrichment factors
dc.subject.enm-ERM-q
dc.subject.enMetal pollution
dc.subject.enMercury
dc.subject.enSilver
dc.subject.enHotspot
dc.subject.enLoire Estuary
dc.title.enSpatial distribution of trace elements in the surface sediments of a major European estuary (Loire Estuary, France): Source identification and evaluation of anthropogenic contribution
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.seares.2016.08.005en_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalJournal of Sea Research (JSR)en_US
bordeaux.page77-91en_US
bordeaux.volume118en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-03771972
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
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