title: 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 -0.25 V (vs Ag/AgCl, KCl 3M) 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 H(2)S volatilization. The limit of detection (LOD) is 30 nM 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.
authors.affiliation: Université de Bretagne Occidentale, IUEM, Lemar UMR CNRS 6539, Plouzané, France.
authors.forename: Virginie
authors.initials: V
authors.lastname: Aumond
authors.forename: Matthieu
authors.initials: M
authors.lastname: Waeles
authors.forename: Pascal
authors.initials: P
authors.lastname: Salaün
authors.forename: Kristoff
authors.initials: K
authors.lastname: Gibbon-Walsh
authors.forename: Constant M G
authors.initials: CM
authors.lastname: van den Berg
authors.forename: Pierre-Marie
authors.initials: PM
authors.lastname: Sarradin
authors.forename: Ricardo D
authors.initials: RD
authors.lastname: Riso