Quantifying the impacts of artisanal gold mining on a tropical river system using mercury isotopes
| dc.rights.license | open | en_US |
| hal.structure.identifier | Laboratoire Ecologie Fonctionnelle et Environnement [LEFE] | |
| hal.structure.identifier | Institut Ecocitoyen pour la Connaissance des Pollutions [Fos-sur-Mer] | |
| dc.contributor.author | GOIX, Sylvaine | |
| hal.structure.identifier | Laboratoire des Mécanismes et Transfert en Géologie [LMTG] | |
| hal.structure.identifier | Géosciences Environnement Toulouse [GET] | |
| dc.contributor.author | MAURICE, Laurence | |
| hal.structure.identifier | Géosciences Environnement Toulouse [GET] | |
| dc.contributor.author | LAFFONT, Laure | |
| hal.structure.identifier | Parc Amazonien de Guyane | |
| dc.contributor.author | RINALDO, Raphaelle | |
| hal.structure.identifier | Géosciences Environnement Toulouse [GET] | |
| dc.contributor.author | LAGANE, Christelle | |
| hal.structure.identifier | Laboratoire Magmas et Volcans [LMV] | |
| dc.contributor.author | CHMELEFF, Jérôme | |
| hal.structure.identifier | Géosciences Environnement Toulouse [GET] | |
| hal.structure.identifier | German Research Centre for Geosciences - Helmholtz-Centre Potsdam [GFZ] | |
| dc.contributor.author | MENGES, Johanna | |
| hal.structure.identifier | Institut méditerranéen d'océanologie [MIO] | |
| hal.structure.identifier | Géosciences Environnement Toulouse [GET] | |
| dc.contributor.author | HEIMBÜRGER-BOAVIDA, Lars-Eric | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | MAURY-BRACHET, Régine | |
| hal.structure.identifier | Géochimie des Isotopes Stables [GIS] | |
| dc.contributor.author | SONKE, Jeroen | |
| dc.date.accessioned | 2024-01-24T15:10:06Z | |
| dc.date.available | 2024-01-24T15:10:06Z | |
| dc.date.issued | 2019-03 | |
| dc.identifier.issn | 0045-6535 | en_US |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/187497 | |
| dc.description.abstractEn | Total mercury (Hg) concentrations, speciation and isotopic composition were analyzed in soils and sediments along the Oyapock River (French Guiana), subjected to intense artisanal and small-scale gold-mining (ASGM). As a large part of these mining activities is illegal, amalgamation of gold with liquid Hg(0) is the main exploitation process. Further chemical analyses were performed along the same river, in bedrocks, waters, suspended matter, sediments and soils in both pristine and gold-mining areas. Physico-chemical parameters and Hg isotopic composition measured in the different matrices of the pristine area allowed us to trace the origin and fate of the natural Hg. We find that Hg in tropical topsoils preferentially originates from gaseous Hg(0) uptake by plants rather than from wet deposition. A strong negative mass independent fractionation (MIF) between topsoils and deeper horizons was attributed to pre-anthropogenic atmospheric Hg deposition with low MIF that leached to deeper horizons. Hg isotopic composition in pristine sediments confirmed that Hg in river sediments mainly originates from deep soil erosion and is subjected to aquatic photochemical reduction. Combining a Hg-isotope binary mixing model with a multiple linear regression based on physico-chemical parameters, we determined that the currently mined creek sediments are contaminated in Hg. This excess of Hg, which can represent more than half of the total Hg concentration, mainly originates from liquid | |
| dc.language.iso | EN | en_US |
| dc.subject.en | French Guiana | |
| dc.subject.en | sediment | |
| dc.subject.en | mercury isotopes | |
| dc.subject.en | soil | |
| dc.subject.en | water | |
| dc.subject.en | gold mining | |
| dc.title.en | Quantifying the impacts of artisanal gold mining on a tropical river system using mercury isotopes | |
| dc.type | Article de revue | en_US |
| dc.identifier.doi | 10.1016/j.chemosphere.2018.12.036 | en_US |
| dc.subject.hal | Sciences de l'environnement/Milieux et Changements globaux | en_US |
| dc.subject.hal | Sciences du Vivant [q-bio]/Ecologie, Environnement | en_US |
| bordeaux.journal | Chemosphere | en_US |
| bordeaux.page | 684-694 | en_US |
| bordeaux.volume | 219 | en_US |
| bordeaux.hal.laboratories | EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805 | en_US |
| bordeaux.institution | Université de Bordeaux | en_US |
| bordeaux.institution | CNRS | en_US |
| bordeaux.team | EA | en_US |
| bordeaux.peerReviewed | oui | en_US |
| bordeaux.inpress | non | en_US |
| bordeaux.import.source | hal | |
| hal.identifier | hal-02107221 | |
| hal.version | 1 | |
| hal.popular | non | en_US |
| hal.audience | Internationale | en_US |
| hal.export | false | |
| workflow.import.source | hal | |
| dc.rights.cc | Pas de Licence CC | en_US |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Chemosphere&rft.date=2019-03&rft.volume=219&rft.spage=684-694&rft.epage=684-694&rft.eissn=0045-6535&rft.issn=0045-6535&rft.au=GOIX,%20Sylvaine&MAURICE,%20Laurence&LAFFONT,%20Laure&RINALDO,%20Raphaelle&LAGANE,%20Christelle&rft.genre=article |
