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| Registros recuperados: 42 | |
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| Luyten, S.; Smeyers-Verbeke, J.; Massart, D.L.. |
| In clinical chemistry it can be very useful to have a rapid method for the determination of trace elements in biological material available. Because the classical wet digestion method which is generally used for the destruction of biological materials requires much attention, two procedures were tried which should be less time consuming or require less attention. The two new procedures which are the soluene (a quaternary ammonium hydroxide) method of Jackson (1) and the method of Adrian (2) utilizing pressure were applied to the determination of Cu and Zn in human brain tissue and in fish meal by atomic absorption spectroscopy. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chemical analysis; Trace metals. |
| Ano: 1973 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3474 |
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| Luoma, S. |
| It has been established that direct uptake of (at least some) trace metals from sediments contributes to metal concentrations in benthic organisms. Important controls on metal uptake from sediment are the concentration of the exposure, the partitioning of the metals among components of the sediment, and the redox potential of the sediment. Important problems in ecology, physiology, geochemistry and biogeochemistry remain unresolved, however, and a concentrated interdisciplinary research effort will be necessary before a complete understanding of the fate and impact of sediment-bound metals will be possible. |
| Tipo: Text |
Palavras-chave: Bioaccumulation; Benthos; Food webs; Biogeochemical cycle; Sediments; Availability; Trace metals. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/acte-1302.pdf |
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| Nozaki, Y; Yamada, M; Nakanishi, T; Nagaya, Y; Nakamura, K; Shitashima, K; Tsubota, H. |
| Presented here is the first detailed geochemical data set on the U/Th series Th, Pa, Ac, and Pb isotopes and artificial fallout radionuclides (Sr-90, Cs-137, and Pu isotopes), and some trace elements (V, Zn, Cd, Cu, Mn, and Ni) in two water columns of the Japan and Bonin trenches down to the bottom depths of 7585 m and 9750 m, respectively. Hydrographic properties such as temperature, salinity, dissolved oxygen, and nutrient content within the trench valley remain constant at the same levels as those in the bottom water of the Northwest Pacific basin (typically similar to 6000 m in depth). The radionuclide activities and most trace metal concentrations are also not very different from those in the overlying water at depths of around 5000-6000 m. This means... |
| Tipo: Text |
Palavras-chave: Uranium - thorium; Nucléide artificiel; Balayage; Métal-trace; Temps de résidence; U/Th series nuclides; Artificial radionuclides; Scavenging; Trace metals; Renewal of trench water. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00326/43669/43201.pdf |
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| Migon, C; Gentili, B; Journel, B. |
| A correlation analysis based on the concept of singular-value decomposition of a matrix is applied here to an atmospheric aerosol data set, for twelve metals (Al, Ca, Cd, Co, Cu, Fe, Mg, Mn, Na, Ni, Pb and Zn),in the Ligurian Sea coastal environment. An iterative procedure allows atypical samples to be discarded, i.e. samples with characteristics significantly different to those of the whole data set. After five atypical samples have been objectively discarded, the general characteristics of the data set are better described and some features are enhanced according to a decreasing order of importance, For example, the mineral dust character of almost every metal is shown, which points out that the marine recycling component is negligible. Marine (Mg, Na)... |
| Tipo: Text |
Palavras-chave: Mer Ligure; Aérosol atmosphérique; Métaux-traces; Analyse statistique; Ligurian Sea; Atmospheric aerosol; Trace metals; Statistical analysis. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00325/43576/44044.pdf |
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| Dange, Catherine. |
| Most of trace elements have a non conservative behavior in estuarine environments. It is the case of cadmium, cobalt and caesium for which the fate in estuarine and coastal zones is largely controlled by their distribution between water and suspended particles, which generally have high residence times or can be definitely deposited in these areas. Metallic contaminants and radionuclides can be present under various species : dissolved (mineral and organic complexes), colloidal and particulate forms (adsorbed, precipitated) or integrated by various mechanisms in the organisms. Such distributions are the result of processes (physical, chemical, biological) which are controlled by many factors (ionic strengh, pH, Eh, major cations concentration, nature and... |
| Tipo: Text |
Palavras-chave: Modeling; French estuaries; Caesium; Cobalt; Cadmium; Radionuclides; Trace metals; Speciation; Modélisation; Estuaires français; Cesium; Cobalt; Cadmium; Radionucléides; Métal trace; Speciation. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/these-183.pdf |
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| Casas, Stellio. |
| Monitoring coastal contamination of trace metals using bivalve molluscs as quantitative bioindicators is widely used in many international monitoring programs. The bioaccumulation of metal within an organism results from the interaction between physiological (growth, loss of weight, absorption, accumulation), chemical (metal concentration, speciation, bioavailability) and environmental factors (temperature, SPM, chlorophyll). By utilizing the parameters above in this study, it appears that modeling metal dynamics in marine mussels is a reliable tool. The model allows understanding the bioaccumulation process which results from the interactions between biological, chemical and environmental factors. One of the objective of this study was to couple a... |
| Tipo: Text |
Palavras-chave: Biomonitoring; Dynamic Energy Budget; Model; Trace metals; Bioaccumulation; Mytilus galloprovincialis; Mussel; Bioindicator; Surveillance; Budget énergétique dynamique; Modèle; Métaux traces; Bioaccumulation; Mytilus galloprovincialis; Moule; Bioindicateur. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/these-356.pdf |
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| Fishar, M.R.A.; Ali, M.H.H.. |
| Concentrations of major metals (Na, K, Ca, Mg) and some trace metals (Fe, Zn, Mn, Ni, Cu, Co, Pb, Cr, Cd) were determined in water, sediment, benthos and some common fish species from Lake Qarun. Water and sediment samples were collected from seven stations where, the benthos and fish species were collected from three sites representing east, middle and west of the lake. Distribution of studied metals showed that, east part generally had higher contamination than west one which may be attributed to the impact of pollution sources in this area which coming from El-Batts Drain and pumping station in the east part. Mollusca and Crustacea especially Barnacles have the highest concentrations of most heavy metals measured more than Polychaeta which make them... |
| Tipo: Journal Contribution |
Palavras-chave: Lake Qarun; Trace metals; Benthos; Fish SEDIMENTS Absorption coefficient Accumulation Biochemical analysis Benthic fish Trace metals Absorption http://aims.fao.org/aos/agrovoc/c_27. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1215 |
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| Chouba, L.; Mzougui-Aguir, N.. |
| Dans l’objectif de déterminer l’état de la contamination organique et inorganique des sédiments superficiels de la frange côtière du golfe de Gabès, nous avons évalué les concentrations en hydrocarbures aromatiques totaux, en cadmium (Cd), en plomb (Pb) et en mercure (Hg). L’échantillonnage a été effectué à bord d’une barque motorisée, à l’aide d’une benne Van Veen au niveau de 25 stations. Les concentrations du Cadmium et du Plomb ont été déterminées par Spectrométrie d’Absorption Atomique à Four Graphite (Varian 220Z) alors que pour le Mercure les analyses ont été réalisées par Spectrométrie d’Absorption Atomique à vapeur froide. Les hydrocarbures totaux ont été analysés par UV-Fluorescence (UV-F). Les concentrations du Cadmium et du Mercure dans la... |
| Tipo: Journal Contribution |
Palavras-chave: Cadmium; Coastal waters; Hydrocarbons; Lead; Marine pollution; Mercury; Pollution monitoring; Sediments; Trace metals. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/4275 |
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| Tissaoui, Ch.; Chouba, L.; El Abed, O.. |
| La Tunisie dispose d’une ressource importante en coquillages, plusieurs espèces sont commercialisées et elles ont fait l’objet de programmes de qualité pour la sauvegarde de la santé humaine. Dans ce contexte, nous avons réalisé un suivi saisonnier de la concentration de trois métaux traces toxiques, le cadmium (Cd), le plomb (Pb), et le mercure (Hg) dans la totalité de la masse molle, dans le pied et dans les viscères d’un Mollusque Gastéropode, l’Hexaplex trunculus communément appelé en Tunisie « Bakouma ». Les Hexaplex proviennent des golfes de Tunis et de Gabès et des lagunes de Bizerte et de Tunis durant la période 2003 - 2004. Les échantillons sont analysés par spectrométrie d’absorption atomique (SAA) à four graphite et à correction Zeeman (Varian... |
| Tipo: Journal Contribution |
Palavras-chave: Pollution monitoring; Trace metals; Pollution control; Http://aims.fao.org/aos/agrovoc/c_6078. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/4153 |
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| Chouba, L.; Tissaoui, Ch.; El Abed, A.. |
| La Tunisie dispose d’une ressource importante en coquillages, plusieurs espèces sont commercialisées et elles ont fait l’objet de programmes de qualité pour la sauvegarde de la santé humaine. Dans ce contexte, nous avons réalisé un suivi saisonnier de la concentration de trois métaux traces toxiques, le cadmium (Cd), le plomb (Pb), et le mercure (Hg) dans la totalité de la masse molle, dans le pied et dans les viscères d’un Mollusque Gastéropode, l’Hexaplex trunculus communément appelé en Tunisie « Bakouma ». Les Hexaplex proviennent des golfes de Tunis et de Gabès et des lagunes de Bizerte et de Tunis durant la période 2003 - 2004. Les échantillons sont analysés par spectrométrie d’absorption atomique (SAA) à four graphite et à correction Zeeman (Varian... |
| Tipo: Journal Contribution |
Palavras-chave: Hexaplex trunculus; Pollution monitoring; Trace metals; Marine molluscs. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/3777 |
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| Registros recuperados: 42 | |
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