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Goix S., Maurice Laurence, Laffont L., Rinaldo R., Lagane Christelle, Chmeleff J., Menges J., Heimburger L. E., Maury-Brachet R., Sonke J. E. (2019). Quantifying the impacts of artisanal gold mining on a tropical river system using mercury isotopes. Chemosphere, 219, 684-694. ISSN 0045-6535

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Lien direct chez l'éditeur doi:10.1016/j.chemosphere.2018.12.036

Titre
Quantifying the impacts of artisanal gold mining on a tropical river system using mercury isotopes
Année de publication2019
Type de documentArticle référencé dans le Web of Science WOS:000457511700075
AuteursGoix S., Maurice Laurence, Laffont L., Rinaldo R., Lagane Christelle, Chmeleff J., Menges J., Heimburger L. E., Maury-Brachet R., Sonke J. E.
SourceChemosphere, 2019, 219, p. 684-694. ISSN 0045-6535
RésuméIn some locations, artisanal and small-scale gold-mining (ASGM) represents a significant source of anthropogenic Hg to freshwater environments. The Hg released from ASGM can contaminate aquatic fauna and pose health risks to downstream populations. Total Hg (THg) concentrations, speciation, and isotopic compositions were analyzed in water, suspended particulate matter, soil, and bottom sediment samples from pristine areas and in places of active and legacy gold mining along the Oyapock River (French Guiana) and its tributaries. Mass-independent fractionation (MIF) of even Hg isotopes in top soils (Delta Hg-200 = -0.06 +/- 0.02 parts per thousand, n = 10) implied the uptake of gaseous Hg(0) by plants, rather than wet deposition, as the primary Hg source. Odd isotope MIF was lower in deep soils (Delta Hg-199 = -0.75 +/- 0.03 parts per thousand, n = 7) than in top soils (Delta Hg-199 = -0.55 +/- 0.15 parts per thousand, n = 3). This variation could be attributed to differences between the isotopic signatures of modern and pre-industrial atmospheric Hg. Combining a Hg-isotope binary mixing model with a multiple linear regression based on physicochemical parameters measured in the sediment samples, we determined that active mined creek sediments are contaminated by ASGM activities, with up to 78% of THg being anthropogenic. Of this anthropogenic Hg, more than half (66-74%) originates from liquid Hg(0) that is released during ASGM. The remaining anthropogenic Hg comes from the ASGM-driven erosion of Hg-rich soils into the river. The isotope signatures of anthropogenic Hg in bottom sediments were no longer traceable in formerly mined rivers and creeks.
Plan de classementGéologie et formations superficielles [064] ; Hydrologie [062] ; Pollution [038]
Descr. géo.GUYANE FRANCAISE
LocalisationFonds IRD [F B010075107]
Identifiant IRDfdi:010075107
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010075107

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