Data/hora: 16/06/2024 19:44:38

Provedor de dados: | 5
País: | France
Título: | Sulfide determination in hydrothermal seawater samples using a vibrating gold micro-wire electrode in conjunction with stripping chronopotentiometry
Autores: | Aumond, Virginie; Waeles, Mathieu; Salaun, Pascal; Gibbon-walsh, Kristoff; Van Den Berg, Constant M. G.; Sarradin, Pierre-marie; Riso, Ricardo D.
Data: | 2012-11
Ano: | 2012
Palavras-chave: | Sulfide; Stripping chronopotentiometry; Vibrating electrode; Gold; Seawater; Hydrothermal.
Resumo: | 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.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/00111/22222/20065.pdf

DOI:10.1016/j.aca.2012.09.044

Editor: | Elsevier Science Bv
Relação: | http://archimer.ifremer.fr/doc/00111/22222/
Formato: | application/pdf
Fonte: | Analytica Chimica Acta (0003-2670) (Elsevier Science Bv), 2012-11 , Vol. 753 , P. 42-47
Fonte: | 2012 Elsevier B.V. All rights reserved.