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	Provedor de dados ArchiMer (2) Autor Aumond, Virginie (2) Gibbon-walsh, Kristoff (1) Riso, Ricardo D. (1) Salaun, Pascal (1) Sarradin, Pierre-marie (1) Van Den Berg, Constant M. G. (1) Waeles, Mathieu (1) Mais... Palavra-chave Hydrothermal (2) Analyse chimique (1) Bouches hydrothermales (1) Cuivre (1) Cuivre -- Spéciation (1) Dorsale Médio-Atlantique (1) Gold (1) Guaymas (1) Lucky Strike (1) Seawater (1) Spéciation (1) Stripping chronopotentiometry (1) Sulfide (1) Sulfures (1) Vibrating electrode (1) Mais... Tipo do documento Text (2) Ano 2013 (1) 2012 (1) País France (2) Idioma Francês (1) Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Spéciation du cuivre en milieu hydrothermal profond et dans les zones de suintements froids ArchiMer Aumond, Virginie. This work presents the copper speciation in the deep ocean and the exchanges existing between different size fractions : particulate, dissolved and colloidal. It focus on the mixing zone between deep sources and seawater. The enhancement of our knowledge and the optimization of instrumentation make possible the development of sampling and analysis strategies accorded with the nature and the accessibility of these extreme environments. A part of this work consisted in the development of effective analysis methods for the quantification of copper and copper’s ligands. Our results showed that physical speciation seems to be essentially controlled by the variations of pH and oxydoreductive caracteristics during the dilution of the hydrothermal fluid by... Tipo: Text Palavras-chave: Analyse chimique; Spéciation; Hydrothermal; Cuivre; Sulfures; Dorsale Médio-Atlantique; Lucky Strike; Guaymas; Cuivre -- Spéciation; Bouches hydrothermales. Ano: 2013 URL: https://archimer.ifremer.fr/doc/00692/80379/83500.pdf Sulfide determination in hydrothermal seawater samples using a vibrating gold micro-wire electrode in conjunction with stripping chronopotentiometry ArchiMer Aumond, Virginie; Waeles, Mathieu; Salaun, Pascal; Gibbon-walsh, Kristoff; Van Den Berg, Constant M. G.; Sarradin, Pierre-marie; Riso, Ricardo D.. A rapid electrochemical stripping chronopotentiometric procedure to determined sulfide in unaltered hydrothermal seawater samples is presented. Sulfide is deposited at -0.25 V (vs Ag/AgCl, KCl 3 M) at a vibrating gold microwire and then stripped through the application of a reductive constant current (typically -2 mu A). The hydrodynamic conditions are modulated by vibration allowing a short deposition step, which is shown here to be necessary to minimize H2S volatilization. The limit of detection (LOD) is 30 nM after a deposition step of 7s. This LOD is in the same range as the most sensitive cathodic voltammetric technique using a mercury drop electrode and is well below those reported previously for other electrodes capable of being implemented in situ.... Tipo: Text Palavras-chave: Sulfide; Stripping chronopotentiometry; Vibrating electrode; Gold; Seawater; Hydrothermal. Ano: 2012 URL: http://archimer.ifremer.fr/doc/00111/22222/20065.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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