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METHODES ELECTROCHIMIQUES POUR L'ANALYSE IN SITU DE COMPOSES BIOACTIFS EN MILIEU OCEANIQUE

Marielle Lacombe 1
1 DYNBIO LEGOS
LEGOS - Laboratoire d'études en Géophysique et océanographie spatiales
Abstract : The implementation of in situ autonomous observatories for biogeochemical studies 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 analytical developments 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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Submitted on : Monday, February 18, 2008 - 9:59:47 AM
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Marielle Lacombe. METHODES ELECTROCHIMIQUES POUR L'ANALYSE IN SITU DE COMPOSES BIOACTIFS EN MILIEU OCEANIQUE. Océan, Atmosphère. Université Paul Sabatier - Toulouse III, 2007. Français. ⟨tel-00256800⟩

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