Sulfide determination in hydrothermal seawater samples using a vibrating gold micro-wire electrode in conjunction with stripping chronopotentiometry
|Author(s)||Aumond Virginie1, Waeles Mathieu1, Salaun Pascal2, Gibbon-Walsh Kristoff1, 2, 3, Van Den Berg Constant M. G.2, Sarradin Pierre-Marie4, Riso Ricardo D.1|
|Affiliation(s)||1 : Univ Bretagne Occidentale, IUEM, Lemur UMR CNRS 6539, F-29280 Plouzane, France.
2 : Univ Liverpool, Sch Environm Sci, Liverpool L69 3GP, Merseyside, England.
3 : Univ Toulon & Var, RCMO PROTEE Lab, F-83957 La Garde, France.
4 : IFREMER, Inst Carnot EDROME, F-29280 Plouzane, France.
|Source||Analytica Chimica Acta (0003-2670) (Elsevier Science Bv), 2012-11 , Vol. 753 , P. 42-47|
|WOS© Times Cited||10|
|Keyword(s)||Sulfide, Stripping chronopotentiometry, Vibrating electrode, Gold, Seawater, Hydrothermal|
|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 mu A). 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 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. (C) 2012 Elsevier B.V. All rights reserved.|