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| Registros recuperados: 32 | |
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| Michel, Pierre. |
| Introduction: Measuring the chemical oxygen demand (COD) is a way of determining the organic matter in water based on its oxidisibility by bichromate. The presence of organic matter in sea water is one of the factors that determines the productivity of the oceans: whether this organic matter will be absorbed directly or must first be transformed into nutritive substances by bacteria. This beneficial action also has its limits. On the one hand, consumption of organic matter remains limited; when it exceeds a certain rate, there is no longer any increase in productivity. On the other hand, the excess organic matter deteriorates by consuming the dissolved oxygen and thus competes with marine life. In extreme cases, this excess can cause the eutrophication of... |
| Tipo: Text |
Palavras-chave: Methodology; Organic matter; Oxygen demand; Seawater. |
| Ano: 1972 |
URL: http://archimer.ifremer.fr/doc/1972/publication-2060.pdf |
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| Donard, Ofx; Michel, Pierre. |
| The fate of trace metals in the environment and their impact have been a major concern for more than 20 years. Most previous studies have been limited to total metal determination. in general organometallic forms of metals are much more toxic than their inorganic counterparts. Today, the linking of gas or liquid separation techniques with atomic spectrometry detectors will help improve our understanding of the intricate and critical cycles of organometallic forms of metals and metalloids throughout the environment. |
| Tipo: Text |
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| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00190/30167/28750.pdf |
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| Alzieu, Claude; Andral, Bruno; Bassoullet, Philippe; Boutier, Bernard; Gonzalez, Jean-louis; Huet, Martial; Jestin, Herve; L'Yavanc, Jacky; Michel, Pierre; Paulet, Yves-marie; Quiniou, Francoise; Silva Jacinto, Ricardo. |
| Le projet à pour but de modéliser la dispersion des immersions des boues de dragage, à partir de modèles numériques de manière à pouvoir évaluer le devenir de la charge particulaire et des contaminants associés. Les résultats des expérimentations en laboratoire montrent, qu'à l'échelle représentative du temps de séjour des particules dans la colonne d'eau du champ proche (quelques heures), on ne constate pas de solubilisation des métaux. La libération de la fraction associée aux eaux interstitielles et les flux à l'interface eau-sédiment (diagenèse précoce) après dépôt des sédiments rejetés, sont les processus qui pourraient être la cause d'un apport important de Cd (ou autre contaminant) dissous dans le milieu. Les hypothèses retenues pour l'élaboration... |
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| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00075/18621/16172.pdf |
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| Gouygou, Jean-paul; Michel, Pierre. |
| L'accident de l'"Amoco-Cadiz"le 16 mars 1978 est venu compromettre gravement les activites ostréicoles implantées en Bretagne nord et plus spécialement dans l'Aber Benoît, l'Aber Wrac'h et la baie de Morlaix. Malgré l'importance de la contamination, il est vite apparu que sur les huîtres les mortalites dues au petrole étaient insignifiantes et les consequences sur la physiologie des animaux restaient mineures. Par contre, du fait de l'aptitude de ces coquillages à concentrer les hydrocarbures presents dans l'eau et les matières solides en suspension, on a très vite atteint des concentrations en petrole interdisant la commercialisation de ces produits avec toutes les consequences économiques qui en resultent. En baie de Morlaix, soumise à l'action directe... |
| Tipo: Text |
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| Ano: 1981 |
URL: http://archimer.ifremer.fr/doc/00046/15686/13088.pdf |
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| 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 |
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| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00101/21185/18802.pdf |
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| Registros recuperados: 32 | |
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