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Solid and aqueous mercury in remote river sediments (Litany River, French Guyana, South America)

Abstract : Mercury content in river sediments was investigated, in the Haut Maroni river basin (French Guyana, South America), around Antecume-Pata, a village where Wayanas Amerindians are contaminated with mercury. Solid sediment particulate total mercury content indicate a 100 to 150 ng/g Hg geochemical background level. Sediments act as an environmental archive: gold mining contaminated sediments have up to 400 ng/g total mercury. Pore waters from contaminated sediments are enriched in Fe(II) and Hg(II) by a factor 40 compared to uncontaminated sediment pore waters, due to more acute anoxie conditions. They act therefore as a major source of dissolved mercury in remote tropical aquatic ecosystems. Keywords: Mercury, sediment, DGT and DET techniques, pore water, gold mining.
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Submitted on : Saturday, March 12, 2022 - 5:51:30 PM
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L. Charlet, G. Roman-Ross, L. Spadini, G. Rumbach. Solid and aqueous mercury in remote river sediments (Litany River, French Guyana, South America). Journal de Physique IV (Proceedings), 2003, 107, pp.281-284. ⟨10.1051/jp4:20030296⟩. ⟨insu-03607109⟩

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