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| Registros recuperados: 54 | |
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| Chiffoleau, Jean-francois. |
| Le ROCCH (Réseau d’Observatoire de la Contamination CHimique) est un observatoire de la contamination chimique du milieu marin littoral mis en place par le ministère chargé de l’Environnement à la fin des années 70 et mis en œuvre par IFREMER. Son objectif est de décrire les distributions de contaminants chimiques sélectionnés sur les côtes de France métropolitaine et certaines régions ultra-marines, et de suivre leur évolution temporelle. La stratégie consiste à mesurer ces contaminants dans des matrices intégratrices, tissus d’organismes inféodés à ces régions ou sédiments de surface. Depuis la fin des années 80, le ROCCH fournit des données environnementales aux conventions des mers régionales (convention OSPAR pour la Manche et l’Atlantique, convention... |
| Tipo: Text |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00405/51617/52170.pdf |
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| Abdou, M.; Schaefer, J.; Cobelo-garcia, A.; Neira, P.; Petit, J. C. J.; Auger, Dominique; Chiffoleau, Jean-francois; Blanc, Gerard. |
| Platinum Group Metals (PGM) are modern, technologically relevant elements for which (i) the anthropogenic cycle has outcompeted the natural cycles and (ii) environmental behavior, fate and impact are still widely unknown. Stripping voltammetry was used for accurate determinations of platinum (Pt) in historical records of river sediments and estuarine oysters from the Gironde fluvial-estuarine continuum (SW France) comprising the Lot River. Sediment cores from the Lot River, dated from 1952 to 2001, showed past Pt contamination due to former industrial (smelter) activities in the Lot River watershed. These samples revealed the phasing-out of a historical Pt contamination with Pt/Th (Thorium) values of 11 × 10− 5 ± 0.79 × 10− 5 for the deepest part of the... |
| Tipo: Text |
Palavras-chave: Platinum; Sediments; Wild oysters; Bioaccumulation. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00311/42177/41478.pdf |
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| Cossa, Daniel; Buscail, R.; Puig, P.; Chiffoleau, Jean-francois; Radakovitch, Olivier; Jeanty, G.; Heussner, S.. |
| Continental margins receive natural and anthropogenic trace elements (TEs) from direct atmospheric deposition of aerosols onto the sea surface and from advection of riverine suspended particles and/or resuspended sediments from the continental shelf/slope. When the margin is incised by submarine canyons, as for example in the Northwestern Mediterranean Sea, most of these particles are preferentially transferred via these topographic features towards their final repositories in the abyssal plain. The Gulf of Lions (GoL) shelf receives the largest particulate riverine input to the Western Mediterranean, with its associated chemical contaminants originating from the industrialized and urbanized Rhone Valley. Sediments samples (grabs, cores and moored traps)... |
| Tipo: Text |
Palavras-chave: Trace-element; Sediment; Canyon; Continental margin; Mediterranean. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00188/29971/28424.pdf |
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| Idardare, Zaina; Chiffoleau, Jean-francois; Moukrim, A; Alla, A; Auger, Dominique; Lefrere, L; Rozuel, Emmanuelle. |
| Metal concentrations were measured monthly during an annual cycle (December 2004 to January 2006) in the tissues of Nereis diversicolor ragworms and sediment from two Moroccan Atlantic coastal lagoons: Oualidia in the north, situated in a highly industrialised urban area and Khnifiss in the south, far from anthropogenic influences. Relatively high levels of Zn, Ag and Cd were found in the sediment of Oualidia lagoon, while Ni concentrations were shown to be high at Khnifiss. The significant metal levels at Oualidia are a result of industrial and urban discharges, coupled with discharges from adjacent phosphate ore processing plants. Trace metal concentrations in worms vary according to season; they are usually high in winter and spring, in relation to the... |
| Tipo: Text |
Palavras-chave: Morocco; Coastal lagoons; Sediments; Nereis diversicolor; Metals. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6127.pdf |
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| Briant, Nicolas; Chouvelon, Tiphaine; Martinez, Laura; Brach-papa, Christophe; Chiffoleau, Jean-francois; Savoye, N.; Sonke, J.; Knoery, Joel. |
| Marine mercury (Hg) concentrations have been monitored in the French coastline for the last half a century using bivalves. The analyses presented in this study concerned 192 samples of bivalves (mussels: Mytilus edulis and Mytilus galloprovincialis and oysters: Crassostrea gigas and Isognomon alatus) from 77 sampling stations along the French coast and in the French Antilles sea. The goals of this study were to assess MeHg levels in various common bivalves from French coastline, and to identify possible geographic, taxonomic or temporal variations of concentrations. We show that the evolution of methylmercury (MeHg) concentrations covary with total mercury (HgT) concentrations. Moreover, in most of the study sites, HgT concentrations have not decreased... |
| Tipo: Text |
Palavras-chave: Mercury; Methylmercury; France; Bivalves; Speciation. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00353/46465/46398.pdf |
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| Boutier, Bernard; Chiffoleau, Jean-francois. |
| La répartition du cadmium dans l'eau, le sédiment et la matière en suspension de la Gironde, du proche plateau cohtinental et de la baie de Marennes-Oléron a été étudiée lors de trois campagnes réalisées en conditions de débits moyens ou d'étiage de la Garonne et de la Dordogne. Des apports anormaux de cadmium particulaire par la Garonne ont été mis en évidence. Après désorption ou solubilisation, ils sont expulsés sous forme dissoute, formant un panache très net mais peu étendu en dehors duquel les concentrations en cadmium dissous sont conformes aux valeurs habituellement observées en milieu côtier. Les teneurs en cadmium dissous du bas estuaire expliquent les fortes concentrations relevées dans les huîtres de ce secteur. Le caractère récent de la... |
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| Ano: 1986 |
URL: http://archimer.ifremer.fr/doc/00105/21583/19163.pdf |
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| Cossa, Daniel; Fanget, Anne-sophie; Chiffoleau, Jean-francois; Bassetti, M-a; Buscail, R.; Dennielou, Bernard; Briggs, K.; Arnaud, M; Guedron, S.; Berne, Serge. |
| The Rhône pro-delta sediments receive the particulate inputs from the Rhône River, the largest freshwater discharge of the Western Mediterranean Sea. Trace element (TEs: Ag, Cd, Co, Cr, Cu, Ni, Pb, and Zn) concentrations and stable Pb isotope ratios were determined along a 7.7-meter-long sediment core collected from the Rhône prodeltaic lobe, archiving the deposits of the last 400 years. Trace element mean concentrations during the pre-industrialized era (before 1850 AD) were no different from the average composition of Earth’s upper crust, except for Cr. Principal component analysis, performed on TEs and tracers, suggests three origins for TEs that we identified as (i) marine biogenic material (Ag, Cd), (ii) ultramafic rocks (Li, Cr, Ni), and (iii) other... |
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| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00371/48209/48323.pdf |
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| Briant, Nicolas; Chouvelon, Tiphaine; Brach-papa, Christophe; Chiffoleau, Jean-francois; Savoye, Nicolas; Sonke, Jeroen; Knoery, Joel. |
| Mercury (Hg) is a natural element toxic to all living organisms. Its ocean biogeochemical cycle is dominated by atmospheric deposition, which human activities contribute to disrupt signi cantly, and to a lesser extent by riverine discharge. This element is bioamplifed and bioaccumulated in marine food webs. since mercury concentrations in some coastal animal species of high trophic level approach sanitary thresholds, understanding biogeochemical processes and mechanisms leading to these elevated Hg concentrations becomes important. The stable isotopic geochemistry of metal is indeed a very promising way to trace processes and transfers from one mercury biogeochemical reservoir to another (Sonke and Blum, 2013). The stable isotopes of Hg undergo... |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00394/50561/51253.pdf |
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| Petit, Jerome C. J.; Schafer, Jörg; Coynel, Alexandra; Blanc, Gerard; Chiffoleau, Jean-francois; Auger, Dominique; Bossy, Cecile; Derriennic, Herve; Mikolaczyk, Mathilde; Dutruch, Lionel; Mattielli, Nadine. |
| Zinc stable isotopes measurements by MC-ICP-MS, validated by laboratory intercalibrations, were performed on wild oysters, suspended particles and filtered river/estuarine water samples to provide new constraints for the use of Zn isotopes as environmental tracers. The samples selected were representative of the long range (400 km) transport of metal (Zn, Cd, etc.) contamination from former Zn-refining activities at Decazeville (i.e. δ66Zn > 1 ‰) and its phasing out, recorded during 30 years in wild oysters from the Gironde Estuary mouth (RNO/ROCCH sample bank). The study also addresses additional anthropogenic sources (urban and viticulture) and focuses on geochemical reactivity of Zn in the turbidity gradient and the maximum turbidity zone (MTZ) of... |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00277/38852/37390.pdf |
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| Chiffoleau, Jean-francois; Crochet, Sylvette; Rozuel, Emmanuelle; Claisse, Didier. |
| A la demande de la Direction Générale de l'alimentation (DGAL) du Ministère de l'Agriculture, de l'Alimentation et de la Pêche, l'Ifremer a mené une étude sur les teneurs en cadmium, plomb et mercure de pectinidés (coquilles Saint-Jacques et pétoncles) provenant des principales zones de pêche françaises. Ce rapport présente et analyse les résultats acquis dans les différents organes des mollusques (muscles, gonades, glande digestive, reste des tissus mous). En particulier, il indique la part respective de chaque organe dans le contenu total en métal des mollusques. Il a ensuite été procédé à une reconstitution des animaux entiers pour évaluer une concentration globale de ces trois métaux réglementés. Les résultats sont ensuite comparés aux valeurs limites... |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00016/12693/9612.pdf |
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| Lahbib, Youssef; Abidli, Sami; Chiffoleau, Jean-francois; Averty, Bernard; El Menif, Najoua Trigui. |
| We have assessed for the first time the current status of tributyltin (TBT) contamination in Hexaplex trunculus along Tunisian coastal waters. Two sampling campaigns have been performed in July 2004 and July 2007 at seven different sites. The snails were analyzed for imposex status, i.e. Imposex incidence, Relative Penis Length Index (RPLI) and Vas Deferens Sequence Index (VDSI), followed by the quantification of butyltins in their tissues. Imposex was detected in six populations from the 2004 samples and in five populations from the 2007 samples. The imposex incidence ranged from 0 (no imposex) to 100%, the RPLI from 0 to 56.7 and the VDSI from 0 to 4.4. TBT was also detected in six populations in 2004 and five populations in 2007. The concentrations... |
| Tipo: Text |
Palavras-chave: Tunisia; Imposex; Hexaplex trunculus; TBT; Tributyltin. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6499.pdf |
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| Menet-nedelec, Florence; Riou, Philippe; Chiffoleau, Jean-francois; Maheux, Frank; Pierre-duplessix, Olivier; Rabiller, Emilie; Simon, Benjamin. |
| In coastal areas where monitoring data show that fine sediments contain contaminants, remobilization of these materials during aggregate extractions, which create a turbidity plume, might influence water quality. The eastern bay of Seine (France) is under the influence of the Seine plume, one of the most contaminated rivers in Europe. This study aimed at investigating remobilization of metals and organics from sediments in surface water during and after an aggregate dredging, through their behavior between total and dissolved phases. In this study area located 20 kilometers off Le Havre, sediments where sampled to identify potential contaminants. Unfiltered and filtered (< 0,2 µm) surface seawater samples were collected at different stages of the... |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00310/42077/41380.pdf |
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| Registros recuperados: 54 | |
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