|
|
|
| Registros recuperados: 69 | |
|
| |
|
| |
|
|
| Cossa, Daniel; Maggi, Pierre. |
| In this research, biodegradation associated with evaluation of the variations of acute toxicity of 5 anionic detergents towards Anguilla anguilla is described. It appears that the process of anionic detergent biodegradation in sea water is similar to the results obtained by many authors working on fresh water. The experimentation shows 2 different kinds of behavior among the 5 anionic detergents tested: (a) the first category is composed of syndets, without aryl group in their formulation, which are promptly oxidized by bacteria and do not reveal variation of acute toxicity during their biodegradation; (b) the other group includes LAS; those syndets need a quite long bacterial acclimation. On the other hand, their toxicity is reduced whilst they are... |
| Tipo: Text |
Palavras-chave: Anguilla anguilla; Toxicity; Biodegradation; Anionic detergent. |
| Ano: 1973 |
URL: http://archimer.ifremer.fr/doc/1973/publication-2155.pdf |
| |
|
| |
|
| |
|
| |
|
|
| Bombled, Bruno; Cossa, Daniel. |
| Le présent rapport constitue une première présentation des résultats de l'Etude pilote des apports en contaminants par la Seine. Il est consacré aux métaux et à l'arsenic et traite de leurs niveaux de concentration, de leurs variations saisonnières et des flux à l'estuaire. Il comporte des fiches-annexes qui contiennent les méthodes de prélèvement, de filtration et de dosage ainsi que des résumés des résultats. A partir des conclusions, des recommandations sont faites quant aux méthodes à privilégier pour tirer les meilleurs enseignements du suivi des contaminants métalliques et de l'arsenic à la limite amont de l'estuaire de la Seine. Les données contenues dans ce rapport ont été produites par la Cellule de lutte contre la pollution (Service de navigation... |
| Tipo: Text |
|
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00131/24272/22270.pdf |
| |
|
|
| Cossa, Daniel; Michel, Pierre; Noel, Joelle; Auger, Dominique. |
| Mercury (total mercury), arsenic, cadmium, copper and nutrient concentration profiles (fourteen depths) were obtained at the ICES (International Council for the Exploration of the Sea) reference station (46-degrees-N; 6-degrees-W) in 4 680 m of water in the northeastern Atlantic Ocean. Concentrations of mercury generally ranged from 0.4 to 10 pM. The main feature of the vertical mercury profile was a broad peak between 150 and 1 500 m. Examination of the mercury profile in relation to water mass structure and comparison with nutrient and other elemental distributions suggested that its shape results from a remobilization of mercury during mineralization of sinking organic detritus combined with its intense scavenging in deeper waters. |
| Tipo: Text |
|
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00101/21185/18802.pdf |
| |
|
| |
|
| |
|
|
| Cossa, Daniel. |
| Le mercure, principalement le méthylmercure, s'accumule dans les organismes marins à des taux supérieurs à ceux mesurés pour les autres métaux. D'après les données épidémiologiques, la présence de fortes quantités de mercure méthylé dans la chair de poisson peut occasionner des problèmes de santé chez les consommateurs. |
| Tipo: Text |
|
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/publication-7481.pdf |
| |
|
|
| Idlafkih, Z.; Cossa, Daniel; Meybeck, M.. |
| From january 1990 to may 1992, 70 samples have been taken on the River Seine at Poses (75 000 km2, the most downstream station, within a water quality pilot study. lnorganic pollutants (As, Cd, Cu, Hg, Pb, Zn) presented here have been sampled, pretreated and analysed in ultra-clean conditions to avoid any contamination. Dissolved levels are somewhat lower than early 80's survey : As = 990, Cd = 27, Hg = 3, Pb = 500, Cu = 1700, Zn = 9200 (in ng/l). The river pollution is more attested by contents in suspended matter : As = 8.5, Cd = 4.9, Hg = 1.2, Pb = 184, Cu = 174, Zn = 161 (in μ g/g). Metals are essentially linked to the particulate matter While arsenic is more present in dissolved fraction excepted during floods when TSS exceed 100 mg/l, and is... |
| Tipo: Text |
|
| Ano: 1995 |
URL: https://archimer.ifremer.fr/doc/00480/59135/61763.pdf |
| |
|
|
| Cossa, Daniel; Abarnou, Alain; Andral, Bruno; Bougrier, Serge; Buestel, Dominique; Claisse, Didier; Hatt, Philippe-jacques; Stanisiere, Jean-yves. |
| Ce rapport fait suite à la création par les directions DEL et DRV de l'IFREMER d'un groupe de travail, dit RlNBIO, chargé d'étudier les implications de l'usage des transplants de populations de moules pour évaluer la contamination chimiques des zones côtières méditerranéennes. L'objectif du Réseau Intégrateurs Biologiques (RlNBIO) est en effet d'obtenir une évaluation des niveaux de la contamination chimique à l'échelle du bassin méditerranéen français. La méthodologie s'appuie sur la mesure des concentrations en contaminants métalliques et organiques bioaccumulés dans les tissus de moules transplantées (Mytilus galloprovincialis) pendant plusieurs dans les zones à étudier. Or, la phase exploratoire a mis en évidence une interdépendance entre les niveaux... |
| Tipo: Text |
|
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00086/19715/17356.pdf |
| |
|
|
| Laurier, Fabien; Cossa, Daniel; Gonzalez, Jean-louis; Breviere, Emily; Sarazin, G. |
| The speciation and partition of mercury in a macrotidal estuary (Seine estuary, France) was studied in order to explore the role of the high turbidity zone (HTZ) in mercury transfer to the adjacent coastal waters. Water and particles were analyzed to determine the concentrations of various mercury species, including monomethylmercury and the inorganic fraction. The exchangeable particulate mercury, which varies with salinity, and the mercury fraction associated with the amorphous oxyhydroxides were evaluated. The distribution of dissolved mercury species during early mixing suggests non-conservative behavior of organically bound mercury at the head of the estuary. Mercury in the particles covaried positively with suspended particulate matter concentrations... |
| Tipo: Text |
Palavras-chave: Sediments; Biogenic thiols; Fluorescence detection; Seine estuary; Mercury. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/2003/publication-425.pdf |
| |
|
|
| 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... |
| Tipo: Text |
|
| Ano: 2003 |
URL: https://archimer.ifremer.fr/doc/2003/publication-5283.pdf |
| |
|
|
| Melieres, Ma; Pourchet, M; Cossa, Daniel; Charles-dominique, P; Gaucher, P. |
| We present results obtained from a pristine site of French Guiana (South America), at the Pic Matecho, a region far from gold mining activity. This area contains a small permanent lake, a rare situation in French Guiana. Tree canopy, soils and Lake Matecho sediments were analysed in total Hg and Pb-210. The annual deposit of litterfall is estimated at 40 mug (Hg)/m(2)/y. The top sediment content of 0.2 mug (Hg)/g indicates a large contribution of the atmospheric deposit. In sediment, the decrease of total Hg with depth is neither due to local human influence, nor to increase of atmospheric background during this century. It is attributed to remineralization of organic matter in the upper part of the sediment : the majority of the total Hg deposited at the... |
| Tipo: Text |
|
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00000/10630/9348.pdf |
| |
|
| |
|
|
| Cossa, Daniel; Cotte Krief, Marie-hélène; Mason, Robert P.; Bretaudeau-sanjuan, Jane. |
| The purpose of this paper is to investigate the distribution and the relative importance of processes that affect mercury distribution in the water column at the shelf edge of the Celtic Sea, on the western European continental margin. The water column, down to 4500 m, was sampled during two cruises, one in winter 1994 and the other in June 1995, on eight stations. Total mercury concentrations ranged from 0.29 to 9.37 pM with the extreme values in the first 200 m. The highly variable concentrations in the surface layers are attributed to intense atmospheric-sea water exchange processes. The low concentrations encountered in the shelf water prelude any significant influence of continental waters in this area. In the mixed layer, biological uptake and... |
| Tipo: Text |
Palavras-chave: Regeneration; Atmospheric deposition; Deep profile; Upwelling; Atlantic ocean; Celtic Sea; Shelf break; Continental margin; Mercury. |
| Ano: 2004 |
URL: https://archimer.ifremer.fr/doc/2004/publication-660.pdf |
| |
|
| |
|
|
| Laubier, Lucien; Le Moigne, Morgan; Flammarion, Patrick; Thybaud, Eric; Cossa, Daniel. |
| On December 11, 1999, Erika, an oil tanker flying the Maltese flag and loaded with 31 000 t of heavy fuel oil, was making its way from Dunkirk to Livorno when it encountered difficult weather conditions Southwest of the Brittany coast gale force winds 8 to 9 and 6 mwaves). On the morning of 12th December, the captain broadcast an SOS; his vessel was breaking in two, approximately 30 nautical miles to south of Penmarc'h Point (Fig. 1; Finistère, France). The fore section of the vessel sank during the night of the 12-13 December and the aft section was taken in tow on the morning December 13, but subsequently sank in the early afternoon. Both parts lay in 120 m of water and were located 10 km apart. Approximately, 19 000 t of heavy fuel oil were spilled into... |
| Tipo: Text |
Palavras-chave: Atlantique; France; Monitoring programme; Hydrocarbon; Erika; Marine pollution; Ecotoxicology; Ecology. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/publication-1390.pdf |
| |
| Registros recuperados: 69 | |
|
|
|
