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Impact de l'exploitation minière en Guyane française sur les flux de mercure vers les écosystèmes aquatiques.

Abstract : Pedological cover of French Guiana is a storage and transformation compartment for natural and anthropogenic mercury (Hg). Geochemical background of guianese soils is naturally high (0.11-0.50 µg g-1). In the hydromorphic soils of the Combat creek flat, Hg concentrations were high (0.82 ± 0.35 µg g-1) and from former gold mining origin. The study of Hg hydro-geochemical fluxes in the Combat creek watershed has shown that soils act as sinks for inorganic Hg and source of methylmercury (MMHg). Our results demonstrate that gold mining contribute to favor geochemical conditions for Hg methylation. Only the modification of mining practices and post exploitation sites rehabilitation can reduce its impact on hydrosystems and especially on the bioaccumulation of MMHg along the trophic chains.
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https://tel.archives-ouvertes.fr/tel-00264272
Contributor : Stéphane Guédron <>
Submitted on : Friday, March 14, 2008 - 6:05:20 PM
Last modification on : Thursday, November 19, 2020 - 3:54:27 PM
Long-term archiving on: : Thursday, May 20, 2010 - 10:04:51 PM

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Stéphane Guedron. Impact de l'exploitation minière en Guyane française sur les flux de mercure vers les écosystèmes aquatiques.. Géochimie. Université Joseph-Fourier - Grenoble I, 2008. Français. ⟨tel-00264272⟩

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