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

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.
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Submitted on : Tuesday, December 18, 2012 - 4:07:00 PM
Last modification on : Tuesday, May 10, 2022 - 3:25:40 PM

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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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