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Méthodes électrochimiques pour l'analyse in situ de composés bioactifs en milieu océanique ArchiMer
Lacombe, Marielle.
The implementation of in situ autonomous observatories for biogeochemicalstudies in the open ocean water column and in deep-sea chemosynthetic environments is crucial for the understanding of these ecosystems. We focussed this study on silicate and sulphide, two key compounds of the marine food chain. A voltammetric method for sulphide measurements on silver electrode is presented, and a new method for quantitative determination based on the solubility difference between silver chloride and silver sulphide is proposed. A completely reagentless method for silicate measurements is developed using molybdate and protons produced during molybdenum oxidation. These analyticaldevelopments allowed us to validate a submersible potentiostat, first step toward a new...
Tipo: Text Palavras-chave: Water masses; Drake Passage; Sensor; Electrochemistry; Sulphide; Silicate; Deep sea chemosynthetic environments; Open ocean; In situ autonomous observatories; Masses d'eau; Passage de Drake; Capteur; Voltammétrie; Électrochimie; Sulfure; Acide silicique; Écosystèmes profonds; Océan ouvert; Observatoires in situ autonomes.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-3921.pdf
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Cadmium voltametric quantification in table chocolate produced in Chiquinquira-Boyaca, Colombia Acta Agron. (Palmira)
Chaparro-Acuña,Sandra Patricia; Vargas-Moreno,Paola Andrea; Silva-Gómez,Leonardo Andrés; Cárdenas,Oswaldo Eliécer.
Abstract: Bioaccumulation of heavy metals such as cadmium has been a major concern in scientific communities and international food organizations, given the great toxicological risk to the consumer, and in many places there is no detailed record of its actual content. In this way, the need arises to carry out a study and registration of the concentration of this metal in products such as table chocolate, of great consumption at regional and national level. Likewise, we seek to have effective quantification tools and a reliable and affordable method to achieve the aim of this research. In this research, Cadmium content in powdered and granulated table chocolate was determined, elaborated and commercialized in the municipality of Chiquinquira,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Food; Cocoa; Electrochemistry; Heavy metals; Validation.
Ano: 2017 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000200172
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