Sulfide determination in hydrothermal seawater samples using a vibrating gold micro-wire electrode in conjunction with stripping chronopotentiometry.

Virginie Aumond 1 Matthieu Waeles 1, * Pascal Salaün 2 Kristoff Gibbon-Walsh 1, 2, 3 Constant M G Van den Berg 2 Pierre-Marie Sarradin 4 Ricardo D Riso 1
* Auteur correspondant
1 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)
2 Scholl of Environmental Sciences
3 PROTEE - PROcessus de Transfert et d'Echanges dans l'Environnement - EA 3819
4 DEEP/LEP - IFREMER- Département Etude des Ecosystèmes Profonds
Abstract : A rapid electrochemical stripping chronopotentiometric procedure to determined sulfide in unaltered hydrothermal seawater samples is presented. Sulfide is deposited at -0.25V (vs Ag/AgCl, KCl 3M) at a vibrating gold microwire and then stripped through the application of a reductive constant current (typically -2μA). The hydrodynamic conditions are modulated by vibration allowing a short deposition step, which is shown here to be necessary to minimize H(2)S volatilization. The limit of detection (LOD) is 30nM 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.
Keywords : Hydrothermal Seawater Stripping chronopotentiometry Vibrating electrode Gold Sulfide
Type de document :
Article dans une revue
Analytica Chimica Acta, Elsevier Masson, 2012, 753, pp.42-7. 〈10.1016/j.aca.2012.09.044〉
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http://hal.univ-brest.fr/hal-00766675
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Soumis le : mardi 18 décembre 2012 - 16:07:00
Dernière modification le : jeudi 15 mars 2018 - 16:56:04

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Virginie Aumond, Matthieu Waeles, Pascal Salaün, Kristoff Gibbon-Walsh, Constant M G Van den Berg, et al.. Sulfide determination in hydrothermal seawater samples using a vibrating gold micro-wire electrode in conjunction with stripping chronopotentiometry.. Analytica Chimica Acta, Elsevier Masson, 2012, 753, pp.42-7. 〈10.1016/j.aca.2012.09.044〉. 〈hal-00766675〉

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