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Registros recuperados: 5
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A Michaelis–Menten type equation for describing methylmercury dependence on inorganic mercury in aquatic sediments ArchiMer
Cossa, Daniel; Garnier, Cedric; Buscail, Roselyne; Elbaz-poulichet, Francoise; Mikac, Nevenka; Patel-sorrentino, Nathalie; Tessier, Erwan; Rigaud, Sylvain; Lenoble, Veronique; Gobeil, Charles.
Methylation of mercury (Hg) is the crucial process that controls Hg biomagnification along the aquatic food chains. Aquatic sediments are of particular interest because they constitute an essential reservoir where inorganic divalent Hg (HgII) is methylated. Methylmercury (MeHg) concentrations in sediments mainly result from the balance between methylation and demethylation reactions, two opposite natural processes primarily mediated by aquatic microorganisms. Thus, Hg availability and the activity of methylating microbial communities control the MeHg abundance in sediments. Consistently, some studies have reported a significant positive correlation between MeHg and HgII or total Hg (HgT), taken as a proxy for HgII, in aquatic sediments using...
Tipo: Text Palavras-chave: Mercury; Methylmercury; Aquatic sediment; Methylation; Demethylation.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00171/28220/26520.pdf
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A preliminary study of a DGT-labile trace metals distribution in the stratified Krka River estuary (Croatia) ArchiMer
Blataric, Ana-marija; Garnier, Cedric; Omanovic, Dario; Lenoble, Véronique; Cukrov, Neven; Mounier, Stéphane; Gonzalez, Jean-louis; Pizeta, Ivanka.
Tipo: Text
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00077/18854/16427.pdf
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Evidencing the Impact of Coastal Contaminated Sediments on Mussels Through Pb Stable Isotopes Composition ArchiMer
Huy Dang, Duc; Schafer, Jörg; Brach-papa, Christophe; Lenoble, Veronique; Durrieu, Gael; Dutruch, Lionel; Chiffoleau, Jean-francois; Gonzalez, Jean-louis; Blanc, Gerard; Mullot, Jean-ulrich; Mounier, Stephane; Garnier, Cedric.
Heavily contaminated sediments are a serious concern for ecosystem quality, especially in coastal areas, where vulnerability is high due to intense anthropogenic pressure. Surface sediments (54 stations), 50 cm interface cores (five specific stations), river particles, coal and bulk Pb plate from past French Navy activities, seawater and mussels were collected in Toulon Bay (NW Mediterranean Sea). Lead content and Pb stable isotope composition have evidenced the direct impact of sediment pollution stock on both the water column quality and the living organisms, through the specific Pb isotopic signature in these considered compartments. The history of pollution events including past and present contaminant dispersion in Toulon Bay were also demonstrated by...
Tipo: Text
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00288/39884/38624.pdf
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Mobility and fluxes of trace elements and nutrients at the sediment-water interface of a lagoon under contrasting water column oxygenation conditions ArchiMer
Rigaud, Sylvain; Radakovitch, Olivier; Couture, Raoul-marie; Deflandre, Bruno; Cossa, Daniel; Garnier, Cedric; Garnie, Jean-marie.
The early diagenesis of the major carrier phases (Fe and Mn minerals), trace elements (As, Co, Cr, Hg, MeHg, Ni) and nutrients (Sigma NO3, NH4+, Sigma PO4) and their exchange at the sediment water/interface were studied in the Berre Lagoon, a Mediterranean lagoon in France, at one site under two contrasting oxygenation conditions (strictly anoxic and slightly oxic) and at an adjacent site with perennially well-oxygenated water. From the concentration profiles of the primary biogeochemical constituents and trace elements of the pore and bottom waters, as well as the total and reactive particulate phases, it was possible to locate and identify the diagenetic reactions controlling the mobility of trace elements in the sediments and quantify their rates by...
Tipo: Text
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00134/24555/23573.pdf
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Platinum in sediments and mussels from the northwestern Mediterranean coast: temporal and spatial aspects ArchiMer
Abdou, Melina; Schafer, Jorg; Hu, Ruoyu; Gil-diaz, Teba; Garnier, Cedric; Brach-papa, Christophe; Chiffoleau, Jean-francois; Charmasson, Sabine; Giner, Franck; Dutruch, Lionel; Blanc, Gerard.
Platinum (Pt) is considered a Technology Critical Element (TCE) and an emerging metallic contaminant with increasing release into the environment. Gaps in knowledge and understanding of environmental levels, fate and effects of Pt still exist, especially in the marine environment. This work presents Pt concentrations in the northwestern Mediterranean coast including: (i) temporal variability from sediment cores and farmed mussels in the Toulon Bay (historically affected by intense human activities) and (ii) spatial distribution from recent wild mussels collected along ∼ 300 km coastline with contrasting ecosystems (including natural reserves), quantified using voltammetry and inductively coupled plasma-mass spectrometry. The historical (> 100 years)...
Tipo: Text Palavras-chave: Platinum; Sediments; Mussels; Biomonitoring; Mediterranean coast.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00460/57134/59055.pdf
Registros recuperados: 5
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