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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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| Authors: | Virginie Aumond Matthieu Waeles Pascal Salaün Kristoff Gibbon-Walsh Constant MG van den Berg Pierre-Marie Sarradin Ricardo D Riso |
| Institution: | 1. Université de Bretagne Occidentale, IUEM, Lemar UMR CNRS 6539, Place Copernic, F-29280 Plouzané, France;2. Ocean Sciences, School of Environmental Sciences, University of Liverpool, Liverpool L69 3GP, UK;3. RCMO-PROTEE Laboratory, University of Toulon and Var, BP 132, 83957 La Garde, France;4. Ifremer, Institut Carnot EDROME, REM/EEP BP 70, F-29280 Plouzané, France |
| Abstract: | A rapid electrochemical stripping chronopotentiometric procedure to determined sulfide in unaltered hydrothermal seawater samples is presented. Sulfide is deposited at −0.25 V (vs Ag/AgCl, KCl 3 M) at a vibrating gold microwire and then stripped through the application of a reductive constant current (typically −2 μA). The hydrodynamic conditions are modulated by vibration allowing a short deposition step, which is shown here to be necessary to minimize H2S volatilization. The limit of detection (LOD) is 30 nM after a deposition step of 7 s. 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: | Sulfide Stripping chronopotentiometry Vibrating electrode Gold Seawater Hydrothermal |
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