Méthodes électrochimiques pour l'analyse in situ de composés bioactifs en milieu océanique

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Contributeur(s) Paul Sabatier Toulouse III
Identifiant documentaire 9-3921
Identifiant OAI oai:archimer.ifremer.fr:3921
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Auteur(s): Lacombe, Marielle
Mots clés 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
Date de publication 13/12/2007
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Droits de réutilisation info:eu-repo/semantics/openAccess

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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 sensor for in situ measurements. A Drake Passage water masses analysis is also performed using data collected during the Drake ANTIII/3 oceanographic cruise in 2006.
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