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Mercury sources and transformations in a man-perturbed tidal estuary; the Sinnamary Estuary, French Guiana ArchiMer
Muresan, B; Cossa, Daniel; Coquery, M; Richard, S.
The distribution, partition and speciation of mercury (Hg) were studied along the redox gradient of an anthropogenically perturbed tropical estuary, the Sinnamary Estuary in French Guiana. This system is a partially mixed estuary characterized by an anoxic freshwater end-member, while the marine end member consists of the Amazon Plume. The set up of an artificial oxygenation system in the anoxic freshwater end-member generates sharp gradients of major chemical species (iron, sulfides, etc.) coupled with intense organic matter (OM) turnover. The coexistence of oxygenated waters and dissolved sulfides in an organic rich environment depicts the Upper Sinnamary Estuary (USE: part of Sinnamary Estuary under the tidal influence but upstream of the salt...
Tipo: Text Palavras-chave: Partitioning; Speciation; Redox; Mercury; Reservoir; Estuary.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4223.pdf
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Methylmercury formation in the anoxic waters of the Petit-Saut reservoir (French Guiana) and its spreading in the adjacent Sinnamary river ArchiMer
Coquery, M; Cossa, Daniel; Azemard, S; Peretyazhko, T; Charlet, L.
The present work was carried out on the hydroelectric reservoir Petit-Saut on the Sinnamary river in French Guiana. Measurements were performed during the wet and dry seasons along a longitudinal gradient, from upstream of the reservoir in two inflow rivers, to the Sinnamary estuary downstream of the dam. Gold extraction has led to a marked increase in suspended matter and total mercury (HgT) in one of the rivers. Dissolved monomethylmercury (MMHg) measured in surface waters were similar for both rivers: 0.03-0.05 ng l(-1) (1.0-1.7% of the dissolved HgT). These results indicate similar methylation efficiency and/or transfer of MMHg into the dissolved fraction of the water column, independently of the amounts of inorganic mercury transported. Dissolved MMHg...
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Ano: 2003 URL: https://archimer.ifremer.fr/doc/2003/publication-5283.pdf
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Position du groupe AQUAREFsur la question de l’utilisation des échantillonneurs intégratifs passifs (eip) pour le prochain cycle de surveillance (2015-2021). Note complementaire au rapport 2014 - Volets Eaux littorales et continentales ArchiMer
Miège, C; Mazzella, N; Yari, A; Coquery, M; Tixier, C; Gonzalez, J-l; Ghestem, J-p; Togola, A; Lardy-fontan, S.
The AQUAREF group of experts has been asked to take position on the use of passive integrative samplers (PIS) in a Water Framework Directive (WFD) context. The main objective of this 2015 present note is to complete (as much as possible) the 2014 report concerning the possibility of using PIS in comparison with current regulatory surveillance, for the WFD reporting in coastal and continental waters. The SBSE extraction technique was also taken into account for hydrophobic organic substances, as this technique limits the drawbacks of water samples transport (substance degradation in water samples, extra-cost induced by sample volume and weight) for remote sites like French overseas territories. The AQUAREF group took in consideration: on the one hand the...
Tipo: Text Palavras-chave: Surveillance DCE; Échantillonneurs intégratifs passifs (EIP); Polar Organic Chemical Integrative Sampler (POCIS); Semi Permeable Membrane Device (SPMD); Diffusive gradient in thin film (DGT); Stir Bar Sorptive Extraction (SBSE); Low Density PolyEthylene (LDPE); Eaux littorales et continentales; WFD surveillance; Passive integrative samplers (PIS); Polar Organic Chemical Integrative Sampler (POCIS); Semi Permeable Membrane Device (SPMD); Diffusive gradient in thin film (DGT); Stir Bar Sorptive Extraction (SBSE); Low Density PolyEthylene (LDPE); Coastal and continental waters.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00619/73079/72220.pdf
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