Data/hora: 10/06/2024 12:21:54

Provedor de dados: 	5	
País: 	France	
Título: 	Méthodes électrochimiques pour l'analyse in situ de composés bioactifs en milieu océanique	
Autores: 	Lacombe, Marielle.	
Data: 	2007-12-13	
Ano: 	2007	
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.	
Resumo: 	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.	
Tipo: 	Text	
Idioma: 	Francês	
Identificador: 	http://archimer.ifremer.fr/doc/2007/these-3921.pdf	
Editor: 	Paul Sabatier Toulouse III	
Relação: 	http://archimer.ifremer.fr/doc/00000/3921/	
Formato: 	application/pdf