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Lake sediment mercury biogeochemistry controlled by sulphate input from drainage basin

dc.rights.licenseopenen_US
dc.contributor.authorCANREDON, Axel
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorANSCHUTZ, Pierre
ORCID: 0000-0001-5331-7974
IDREF: 076300331
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorBUQUET, Damien
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCHARBONNIER, Celine
hal.structure.identifierInstitut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]
dc.contributor.authorAMOUROUX, David
hal.structure.identifierInstitut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux [IPREM]
dc.contributor.authorTESSIER, Emmanuel
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorPOIRIER, Dominique
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorBUJAN, Stephane
dc.contributor.authorDEVAUX, Ludovic
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorGOUILLIEUX, Benoit
dc.contributor.authorGENTÈS, Sophie
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorLEGEAY, Alexia
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorFEURTET-MAZEL, Agnes
hal.structure.identifierEnvironnement, Géo-ingénierie et Développement [EGID]
dc.contributor.authorGALAUP, Serge
IDREF: 198352050
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorMAURY-BRACHET, Régine
dc.date.accessioned2024-01-24T14:14:01Z
dc.date.available2024-01-24T14:14:01Z
dc.date.issued2019-05
dc.identifier.issn0883-2927en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/187484
dc.description.abstractEnMercury (Hg) and methyl mercury (MeHg) concentrations have never been measured in sediments of coastal lakes of Aquitaine, although high concentrations of Hg have been measured in fish. Our objective was to characterize benthic biogeochemical processes and the distribution of Hg in lake sediments and to connect these results with fish contamination. For this, we mapped and characterized sediments. We measured sediment Hg and MeHg content, and biogeochemical parameters. We identified organic deposits in deep areas, and sandy sediments in shallow areas. Sediments were anoxic below the sediment–water interface. The average Hg concentration in organic sediment was 213 μg kg−1 dry weight. Sandy sediments had an average Hg concentration of 4 μg kg−1 dw. We measured concentrations below 6 μg kg−1 dw in sediments from streams that drain the catchment. Similar concentrations in the four lakes suggest that the source of total Hg was not a point source in a given lake. The highest MeHg concentrations were found in the upper centimetres of organic sediments, where sulphate reduction occurred. MeHg represented 2.53% of total Hg for Lake Carcans-Hourtin, less in other lakes. The proportion of MeHg in sediment followed lake water sulphate concentrations. High sulphate concentrations resulted from agricultural activity in the Lake Carcans-Hourtin catchment. Our results corroborate the hypothesis that Hg methylation is linked to sulphate-reducing activity. High fluxes of sulphate from a drainage basin may induce large proportions of potentially bioavailable MeHg in lake sediment, even in non-polluted areas. The Hg methylation activity in the sediment reflected the exposure of predatory fish to MeHg.
dc.language.isoENen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nc/
dc.subject.enMercury methylation
dc.subject.enFish contamination
dc.subject.enAquatic sediment
dc.subject.enSulphate
dc.subject.enFreshwater lake
dc.title.enLake sediment mercury biogeochemistry controlled by sulphate input from drainage basin
dc.typeArticle de revueen_US
dc.identifier.doi10.1016/j.apgeochem.2019.03.023en_US
dc.subject.halChimie/Chimie analytiqueen_US
dc.subject.halChimie/Chimie théorique et/ou physiqueen_US
dc.subject.halChimie/Polymèresen_US
dc.subject.halChimie/Matériauxen_US
bordeaux.journalApplied Geochemistryen_US
bordeaux.page135-145en_US
bordeaux.volume104en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamECOBIOCen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-02282515
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=Applied%20Geochemistry&rft.date=2019-05&rft.volume=104&rft.spage=135-145&rft.epage=135-145&rft.eissn=0883-2927&rft.issn=0883-2927&rft.au=CANREDON,%20Axel&ANSCHUTZ,%20Pierre&BUQUET,%20Damien&CHARBONNIER,%20Celine&AMOUROUX,%20David&rft.genre=article


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