Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/3168
Título: Evaluation of nanometer thick mercury film electrodes for stripping chronopotentiometry
Autor: Rocha, L. S.
Pinheiro, J. P.
Carapuça, H. M.
Palavras-chave: Thin mercury film electrode
Stripping chronopotentiometry
Scanned stripping chronopotentiometry
Trace metal speciation
Latex nanospheres
Data: 15-Nov-2007
Editora: Elsevier
Citação: Rocha, L.S.; Pinheiro, J.P.; Carapuça, H.M.Evaluation of nanometer thick mercury film electrodes for stripping chronopotentiometry, Journal of Electroanalytical Chemistry, 610, 1, 37-45, 2007.
Resumo: In this work, the performance and applicability of the thin mercury film electrode (TMFE) in the heavy metal speciation, by stripping chronopotentiometry (SCP), were exploited. The TMFE thickness was optimized and a 7.6 nm mercury film was selected. This TMFE was mechanically stable and able to perform 60 SCP consecutive measurements, with no significant variation in the analytical signal of lead(II) (RSD less than 2%). Due to the small electrode thickness the measurements were performed under conditions of complete depletion over a wide oxidation current (Is) range, i.e., within the interval [75–500] × 10−9 A. The limit of detection (3σ) for lead(II) was 2.4 × 10−9 M for a deposition time of 40 s and an oxidation current of 75 × 10−9 A. The TMFE was successfully applied to the construction of SSCP experimental waves, which were in conformity to those predicted by the theory. The stability constant calculated (K′) for the Pb(II)-carboxylated latex nanospheres system using a TMFE, agreed with the one obtained using the HMDE, for identical experimental conditions.
Peer review: yes
URI: http://hdl.handle.net/10400.1/3168
DOI: http://dx.doi.org/doi:10.1016/j.jelechem.2007.06.018
ISSN: 1572-6657
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0022072807002963
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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