Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/3166
Título: Evaluation of poly(sodium 4-styrenesulfonate) film coating in thin mercury film electrodes for lead determination
Autor: Silva, C. P.
Carapuça, H. M.
Rocha, L. S.
Pinheiro, J. P.
Palavras-chave: Chemically modified electrodes
Poly(sodium 4-styrenesulfonate)
Ion-exchange voltammetry
Mercury film electrodes
Lead(II)
Data: 15-Mar-2009
Editora: Elsevier
Citação: Silva, C.P.; Carapuça, H.M.; Rocha, L.S.; Pinheiro, J.P.Evaluation of poly(sodium 4-styrenesulfonate) film coating in thin mercury film electrodes for lead determination, Journal of Electroanalytical Chemistry, 626, 1-2, 192-196, 2009.
Resumo: In this work, polyelectrolyte coatings assembled on glassy carbon/thin mercury film electrodes, as an adsorbed layer of poly(sodium 4-styrenesulfonate) (PSS), were studied. The goal was to search for the best conditions for the production of stable PSS-coated electrodes that could present high negative charge densities within the thin polymeric film, providing a fast and significant electrostatic cation accumulation. Square-wave anodic stripping voltammetry was applied to measure the amount of incorporated lead used as the reference cation. The influence of the composition of the PSS solution, the amount of deposited PSS, molecular weight and of the ionic strength of the electrolyte solution, on the features of the PSS coatings for ion-exchange voltammetry was studied. The PSS films morphology was assessed by SEM. The best PSS coating performance was found for the electrodes prepared from water solutions with a molecular weight of at least 70,000, and a mass loading of ca. 8 μg mm−2. In these conditions a three fold increase was observed in low ionic strength (0.0032 M) media. However, this improvement was not sufficient for the application of direct ion-exchange voltammetry, thus different strategies to obtain polymer films with higher charge densities have to be envisaged.
Peer review: yes
URI: http://hdl.handle.net/10400.1/3166
DOI: http://dx.doi.org/doi:10.1016/j.jelechem.2008.11.001
ISSN: 1572-6657
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0022072808004385
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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