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	Provedor de dados OceanDocs (3) Autor Benítez, R. (1) Dartige, A.Y. (1) Hamed, M.A. (1) Montoya, W. (1) Peña, E.J. (1) Palavra-chave Copper (3) Http://aims.fao.org/aos/agrovoc/c_1868 (3) Algae (1) Bioaccumulation (1) Biological stress (1) Chemical analysis (1) Efficiency (1) Environment (1) Environmental conditions (1) Environments (1) Estuaries (1) Heavy metals (1) Http://aims.fao.org/aos/agrovoc/c_16061 (1) Http://aims.fao.org/aos/agrovoc/c_2223 (1) Http://aims.fao.org/aos/agrovoc/c_2491 (1) Http://aims.fao.org/aos/agrovoc/c_258 (1) Http://aims.fao.org/aos/agrovoc/c_2593 (1) Http://aims.fao.org/aos/agrovoc/c_2673 (1) Http://aims.fao.org/aos/agrovoc/c_32389 (1) Http://aims.fao.org/aos/agrovoc/c_32980 (1) Mais... Tipo do documento Conference Material (1) Journal Contribution (1) Other (1) Ano 2006 (1) 2005 (1) 1999 (1) País Belgium (3) Idioma Espanhol (1) Francês (1) Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Evaluación de la tasa fotosintética del alga verde Rhizoclonium riparium (Roth) Kützing ex Harvey, expuesta a cobre y su uso como indicador de contaminación por metales en aguas estuarinas OceanDocs Montoya, W.; Peña, E.J.; Benítez, R.. Algae have been used as bioindicators by having several advantages such as they have short life cycles, they can take up nutrients directly from water, they are generally easy to collect in sufficient amounts from various habitats; and they readily accumulate compounds present in seawater, making tissue analyses reliable indicators of water quality. In order to evaluate the bioremoval capability of the green alga Rhizoclonium riparium, the photosynthetic responses to heavy metal pollution under different sublethal concentrations of copper was assessed. Photosynthetic rates were significantly low (p <0.05) at low copper concentrations, between (0.01 y 10 mg/l). Maximum photosynthetic values were shown at 30 y 60 mg/l and almost cero at 150 mg/ l of Cu.... Tipo: Conference Material Palavras-chave: Heavy metals; Biological stress; Algae; Indicator species; Pollution; Bioaccumulation; Copper; Water quality; Estuaries; Heavy metals; Pollution; Bioaccumulation; Copper; Water quality; Estuaries; Algae; Indicator species; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6077; Http://aims.fao.org/aos/agrovoc/c_32389; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_16061; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_35790. Ano: 2006 URL: http://hdl.handle.net/1834/2256 Etude des polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans les moules (<Perna perna>) prélevées au niveau de la baie du Lévrier. OceanDocs Dartige, A.Y.. Ce travail a pour objectif de déterminer le niveau de contamination des produits halieutiques mauritaniens. Pour cela, nous avons étudié les polluants chimiques (Cu, Fe, Zn, Cd et Hg) dans des moules (<Perna perna>) prélevées au niveau de la baie du Lévrier en Mauritanie sur une période de quatre mois (novembre 1998 à février 1999). Sur les 400 échantillons analysés les moyennes de concentrations trouvées restent faibles par rapports à celles trouvées dans d'autres zones peu polluées (Amiard et al. 1986b). Ce qui n'est pas le cas du cadmium qui présente des valeurs plus élevées, phénomène fréquemment rencontré le long de la côte ouest africaine (Sidoumou et al. 1992). Par ailleurs, dans cette présente étude il apparaît que les moules de petites... Tipo: Other Palavras-chave: Chemical analysis; Copper; Environmental conditions; Iron; Mercury; Size; Zinc; Copper; Iron; Environmental conditions; Mercury; Size; Zinc; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_3950; Http://aims.fao.org/aos/agrovoc/c_32980; Http://aims.fao.org/aos/agrovoc/c_4751; Http://aims.fao.org/aos/agrovoc/c_7093; Http://aims.fao.org/aos/agrovoc/c_8517. Ano: 1999 URL: http://hdl.handle.net/1834/1225 Pre-concentration and separation of Fe (III), Co (II), Ni (II) and Zn (II) by solid-phase extraction using silica modified with N-propylsalicylaldimine OceanDocs Hamed, M.A.. N- propylsalicylaldimine based on porous silica, as ion exchanger, was used for the separation and preconcentration of Fe3+, Co2+, Ni2+ and Zn2+ from surface water samples collected from eleven locations at Nile river, Mediterranean and Red seas as well as tap water of Mansoura city. The effects of pH value, time of stirring, concentration of eluting acids and some common ionic species on the separation and preconcentration of the investigated metal ions in synthetic aqueous solutions were studied. The results indicate that the optimum conditions for separation are pH = 9.0-9.5 and time of stirring = 30 min. HCl is better eluent for the investigated metal ions than HNO3 except for Fe3+. Citrate and EDTA gave severe interference on the recovery of the metal... Tipo: Journal Contribution Palavras-chave: Copper; Efficiency; Environments; Copper; Efficiency; Environment; Http://aims.fao.org/aos/agrovoc/c_1868; Http://aims.fao.org/aos/agrovoc/c_2491; Http://aims.fao.org/aos/agrovoc/c_2593. Ano: 2005 URL: http://hdl.handle.net/1834/1148 Registros recuperados: 3 Primeira ... 1 ... Última

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