Nafion-mercury coated film electrode for the adsorptive stripping voltammetric determination of lead and cadmium in the presence of pyrogallol red

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dc.contributor.authorNagles, Edgar
dc.contributor.authorArancibia, Veronica
dc.contributor.authorRojas, Carlos
dc.contributor.authorSegura, Rodrigo
dc.date.accessioned2025-01-20T23:57:07Z
dc.date.available2025-01-20T23:57:07Z
dc.date.issued2012
dc.description.abstractAn adsorptive stripping voltammetric (AdSV) method is presented for the simultaneous determination of Pb(II) and Cd(II) at trace levels in natural waters, based on metal complexation with pyrogallol red (PR) and subsequent adsorptive deposition on a Nation-mercury coated glassy carbon electrode (NHgFE). Pyrogallol red forms complexes with a metal:ligand stoichiometry of 1:1 with Pb(II) and of 1:2 with Cd(II). Optimal analytical conditions were pH 4.0 (acetate buffer); C-PR = 2.8 mu mol L-1; E-ads = -0.40 V vs. Ag/AgCl; t(ads) = 100 s. The linear calibration curves ranged from 1.0 mu g L-1 to 16.0 mu g L-1 for Pb(II) and from 1.0 mu g L-1 to 13.0 mg L-1 for Cd(II). The detection limits (S/N=3) were 0.05 mu g L-1 for Pb(II) and 0.01 mg L-1 for Cd(II). The relative standard deviation was 1.0% and 2.0% (n = 7), respectively, for a solution containing 5.0 mu g L-1 Pb(II) and Cd(II). The method was validated by determining Pb(II) and Cd(II) in certified reference waste water (SPS-WW1). Finally, the method was applied to the determination of Pb(II) and Cd(II) in commercial mineral water samples after UV digestion. (C) 2012 Elsevier B.V. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.talanta.2012.05.028
dc.identifier.eissn1873-3573
dc.identifier.issn0039-9140
dc.identifier.urihttps://doi.org/10.1016/j.talanta.2012.05.028
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95192
dc.identifier.wosidWOS:000309785300017
dc.language.isoen
dc.pagina.final124
dc.pagina.inicio119
dc.revistaTalanta
dc.rightsacceso restringido
dc.subjectNafion-mercury coated glassy carbon electrode
dc.subjectLead and Cadmium
dc.subjectPyrogallol red
dc.subjectAdsorptive stripping voltammetry
dc.titleNafion-mercury coated film electrode for the adsorptive stripping voltammetric determination of lead and cadmium in the presence of pyrogallol red
dc.typeartículo
dc.volumen99
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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