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The estuarine geochemical reactivity of Zn isotopes and its relevance for the biomonitoring of anthropogenic Zn and Cd contaminations from metallurgical activities: Example of the Gironde fluvial-estuarine system, France

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPETIT, Jerome C.J.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSCHAFER, Jorg
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCOYNEL, Alexandra
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorBLANC, Gérard
hal.structure.identifierInstitut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
dc.contributor.authorCHIFFOLEAU, Jean-François
hal.structure.identifierInstitut Français de Recherche pour l'Exploitation de la Mer [IFREMER]
dc.contributor.authorAUGER, Dominique
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorBOSSY, Cecile
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDERRIENNIC, Herve
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMIKOLACZYK, Mathilde
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDUTRUCH, Lionel
hal.structure.identifierUniversité libre de Bruxelles [ULB]
dc.contributor.authorMATTIELLI, Nadine
dc.date.accessioned2024-06-03T09:48:52Z
dc.date.available2024-06-03T09:48:52Z
dc.date.issued2015-09-14
dc.identifier.issn0016-7037en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/200218
dc.description.abstractEnZinc stable isotopes measurements by MC-ICP-MS, validated by laboratory intercalibrations, were performed on wild oysters, suspended particles and filtered river/estuarine water samples to provide new constraints for the use of Zn isotopes as environmental tracers. The samples selected were representative of the long range (400 km) transport of metal (Zn, Cd, etc.) contamination from former Zn-refining activities at Decazeville (i.e. δ66Zn > 1‰) and its phasing out, recorded during 30 years in wild oysters from the Gironde Estuary mouth (RNO/ROCCH sample bank). The study also addresses additional anthropogenic sources (urban and viticulture) and focuses on geochemical reactivity of Zn in the turbidity gradient and the maximum turbidity zone (MTZ) of the fluvial Gironde Estuary. In this area, dissolved Zn showed a strong removal onto suspended particulate matter (SPM) and progressive enrichment in heavy isotopes with increasing SPM concentrations varying from δ66Zn = −0.02‰ at 2 mg/L to +0.90‰ at 1310 mg/L. These signatures were attributed to kinetically driven adsorption due to strongly increasing sorption sites in the turbidity gradient and MTZ of the estuary. Oysters from the estuary mouth, contaminated sediments from the Lot River and SPM entering the estuary showed parallel historical evolutions (1979–2010) for Zn/Cd ratios but not for δ66Zn values. Oysters had signatures varying from δ66Zn = 1.43‰ in 1983 to 1.18‰ in 2010 and were offset by δ66Zn = 0.6–0.7‰ compared to past (1988) and present SPM from the salinity gradient. Isotopic signatures in river-borne particles entering the Gironde Estuary under contrasting freshwater discharge regimes during 2003–2011 showed similar values (δ66Zn ≈ 0.35 ± 0.03‰; 1SD, n = 15), i.e. they were neither related to former metal refining activities at least for the past decade nor clearly affected by other anthropogenic sources. Therefore, the Zn isotopic signatures in Gironde oysters reflect the geochemical reactivity of Zn in the estuary rather than signatures of past metallurgical contaminations in the watershed as recorded in contaminated river sediments. The study also shows that the isotopic composition of Zn is strongly fractionated by its geochemical reactivity in the Gironde Estuary, representative of meso–macrotidal estuarine systems.
dc.language.isoENen_US
dc.title.enThe estuarine geochemical reactivity of Zn isotopes and its relevance for the biomonitoring of anthropogenic Zn and Cd contaminations from metallurgical activities: Example of the Gironde fluvial-estuarine system, France
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.gca.2015.08.004en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géochimieen_US
dc.subject.halSciences de l'environnementen_US
bordeaux.journalGeochimica et Cosmochimica Actaen_US
bordeaux.page108-125en_US
bordeaux.volume170en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamTGMen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierinsu-04182120
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Geochimica%20et%20Cosmochimica%20Acta&rft.date=2015-09-14&rft.volume=170&rft.spage=108-125&rft.epage=108-125&rft.eissn=0016-7037&rft.issn=0016-7037&rft.au=PETIT,%20Jerome%20C.J.&SCHAFER,%20Jorg&COYNEL,%20Alexandra&BLANC,%20G%C3%A9rard&CHIFFOLEAU,%20Jean-Fran%C3%A7ois&rft.genre=article


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