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Antimony in the Lot–Garonne river system: a 14-year record of solid–liquid partitioning and fluxes

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorGIL DIAZ, Teba
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.authorBOSSY, Cecile
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorDUTRUCH, Lionel
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorBLANC, Gerard
dc.date.accessioned2024-04-26T10:48:29Z
dc.date.available2024-04-26T10:48:29Z
dc.date.issued2018
dc.identifier.issn1448-2517en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/199351
dc.description.abstractEnAntimony is a trace element ubiquitously present in the environment, but data are lacking on its spatio-temporal distribution in aquatic environments. Long-term records serve as essential tools to decipher temporal patterns, historical sources and sinks and background concentrations in an area. We characterise the temporal concentrations, transport and behaviour of antimony in the Garonne River watershed, the main tributary to the Gironde Estuary, the largest estuary in south-west Europe. AbstractKnowledge of the environmental chemistry of antimony (Sb) in aquatic systems is limited, and a better understanding of its geochemical behaviour is needed. Based on a fourteen-year survey (2003–2016) with monthly measurements of dissolved and particulate Sb at five sites in the Lot–Garonne river system, combined with daily measurements of water discharge and suspended particulate matter, this work characterises Sb behaviour in the upstream major river watershed of the Gironde Estuary. The survey provides a first regional geochemical Sb background in the Garonne River watershed for dissolved (~0.2 µg L−1) and Th-normalised particulate Sb (Sbp/Thp ~0.25) concentrations. Observed decreasing temporal trends (<1 ng L−1 in dissolved and <0.02 mg kg−1 in particulate concentrations per month) at sites representing natural concentrations probably reflect global atmospheric Sb dynamics at the watershed scale. Regular seasonal cycles of solid/liquid partitioning, with higher solubility in summer (matching high dissolved and low particulate concentrations), reflect water-discharge and suspended particulate matter transport dynamics and possibly seasonal (bio)geochemical processes. Furthermore, this coefficient decreases from the river to the estuarine reaches (from average log10Kd 4.3 to minimum 3.7 L kg−1), suggesting an increased solubility of Sb in estuarine systems. Flux estimates indicate the relevance of the dissolved fraction in Sb transport (with negligible influence of the colloidal fraction) and a total flux (dissolved + particulate) entering the Gironde Estuary of 5.66 ± 2.96 t year−1 (~50 % particulate). These results highlight the importance of timescales and environmental parameters for understanding and prediction of future Sb biogeochemistry.
dc.description.sponsorshipAMORAD1 - ANR-11-RSNR-0002en_US
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.title.enAntimony in the Lot–Garonne river system: a 14-year record of solid–liquid partitioning and fluxes
dc.typeArticle de revueen_US
dc.identifier.doi10.1071/EN17188en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géochimieen_US
bordeaux.journalEnvironmental Chemistryen_US
bordeaux.page121en_US
bordeaux.volume15en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue3en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamTGMen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierinsu-04182113
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&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Environmental%20Chemistry&amp;rft.date=2018&amp;rft.volume=15&amp;rft.issue=3&amp;rft.spage=121&amp;rft.epage=121&amp;rft.eissn=1448-2517&amp;rft.issn=1448-2517&amp;rft.au=GIL%20DIAZ,%20Teba&amp;SCHAFER,%20Jorg&amp;COYNEL,%20Alexandra&amp;BOSSY,%20Cecile&amp;DUTRUCH,%20Lionel&amp;rft.genre=article


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