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

Virginie Aumond; Matthieu Waeles; Pascal Salaün; Kristoff Gibbon-Walsh; Constant M G Van den Berg; Pierre-Marie Sarradin; Ricardo D Riso

doi:10.1016/j.aca.2012.09.044

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〉

Domaine :

Sciences de l'environnement

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

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

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