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Nafion/2,2'-bipyridyl-modified bismuth film electrode for anodic stripping voltammetry.
Anal Chim Acta. 2008 Jul 07; 619(2):173-82.AC

Abstract

This paper describes the fabrication, characterisation and the application of a Nafion/2,2'-bipyridyl/bismuth composite film-coated glassy carbon electrode (NC(Bpy)BiFE) for the anodic stripping voltammetric determination of trace metal ions (Zn2+, Cd2+ and Pb2+). The NC(Bpy)BiFE electrode is prepared by first applying a 2.5 mm3 drop of a coating solution containing 0.5 wt% Nafion and 0.1% (w/v) 2,2'-bipyridil (Bpy) onto the surface of a glassy carbon electrode, while the Bi film was plated in situ simultaneously with the target metal ions at -1.4V. The main advantage of the polymer coated bismuth film electrode is that the sensitivity of the stripping responses is increased considerably due to the incorporation of the neutral chelating agent of 2,2'-bipyridyl (Bpy) in the Nafion film, while the Nafion coating improved the mechanical stability of the bismuth film and its resistance to the interference of surfactants. The key experimental parameters relevant to both the electrode fabrication and the voltammetric measurement were optimized on the basis of the stripping signals. With a 2 min deposition time in the presence of oxygen, linear calibration curves were obtained in a wide concentration range (about 2-0.001 microM) with detection limits of 8.6 nM (0.56 microg dm(-3)) for Zn2+, 1.1 nM (0.12 microg dm(-3)) for Cd2+ and 0.37 nM (0.077 microg dm(-3)) for Pb(2+). For nine successive preconcentration/determination/electrode renewal experiments the standard deviations were between 3 and 5% at 1.2 microM for zinc and 0.3-0.3 microM concentration level for lead and cadmium, respectively, and the method exhibited excellent selectivity in the presence of the excess of several potential interfering metal ions. The analytical utility of the stripping voltammetric method elaborated was tested in the assay of heavy metals in some real samples and the method was validated by ICP-MS technique.

Authors+Show Affiliations

Research Group for Technical Analytical Chemistry of the Hungarian Academy of Sciences, Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111, Budapest, Hungary.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18558110

Citation

Torma, Ferenc, et al. "Nafion/2,2'-bipyridyl-modified Bismuth Film Electrode for Anodic Stripping Voltammetry." Analytica Chimica Acta, vol. 619, no. 2, 2008, pp. 173-82.
Torma F, Kádár M, Tóth K, et al. Nafion/2,2'-bipyridyl-modified bismuth film electrode for anodic stripping voltammetry. Anal Chim Acta. 2008;619(2):173-82.
Torma, F., Kádár, M., Tóth, K., & Tatár, E. (2008). Nafion/2,2'-bipyridyl-modified bismuth film electrode for anodic stripping voltammetry. Analytica Chimica Acta, 619(2), 173-82. https://doi.org/10.1016/j.aca.2008.05.004
Torma F, et al. Nafion/2,2'-bipyridyl-modified Bismuth Film Electrode for Anodic Stripping Voltammetry. Anal Chim Acta. 2008 Jul 7;619(2):173-82. PubMed PMID: 18558110.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Nafion/2,2'-bipyridyl-modified bismuth film electrode for anodic stripping voltammetry. AU - Torma,Ferenc, AU - Kádár,Mihály, AU - Tóth,Klára, AU - Tatár,Eniko, Y1 - 2008/05/08/ PY - 2007/12/22/received PY - 2008/04/30/revised PY - 2008/05/02/accepted PY - 2008/6/19/pubmed PY - 2008/6/19/medline PY - 2008/6/19/entrez SP - 173 EP - 82 JF - Analytica chimica acta JO - Anal Chim Acta VL - 619 IS - 2 N2 - This paper describes the fabrication, characterisation and the application of a Nafion/2,2'-bipyridyl/bismuth composite film-coated glassy carbon electrode (NC(Bpy)BiFE) for the anodic stripping voltammetric determination of trace metal ions (Zn2+, Cd2+ and Pb2+). The NC(Bpy)BiFE electrode is prepared by first applying a 2.5 mm3 drop of a coating solution containing 0.5 wt% Nafion and 0.1% (w/v) 2,2'-bipyridil (Bpy) onto the surface of a glassy carbon electrode, while the Bi film was plated in situ simultaneously with the target metal ions at -1.4V. The main advantage of the polymer coated bismuth film electrode is that the sensitivity of the stripping responses is increased considerably due to the incorporation of the neutral chelating agent of 2,2'-bipyridyl (Bpy) in the Nafion film, while the Nafion coating improved the mechanical stability of the bismuth film and its resistance to the interference of surfactants. The key experimental parameters relevant to both the electrode fabrication and the voltammetric measurement were optimized on the basis of the stripping signals. With a 2 min deposition time in the presence of oxygen, linear calibration curves were obtained in a wide concentration range (about 2-0.001 microM) with detection limits of 8.6 nM (0.56 microg dm(-3)) for Zn2+, 1.1 nM (0.12 microg dm(-3)) for Cd2+ and 0.37 nM (0.077 microg dm(-3)) for Pb(2+). For nine successive preconcentration/determination/electrode renewal experiments the standard deviations were between 3 and 5% at 1.2 microM for zinc and 0.3-0.3 microM concentration level for lead and cadmium, respectively, and the method exhibited excellent selectivity in the presence of the excess of several potential interfering metal ions. The analytical utility of the stripping voltammetric method elaborated was tested in the assay of heavy metals in some real samples and the method was validated by ICP-MS technique. SN - 1873-4324 UR - https://www.unboundmedicine.com/medline/citation/18558110/Nafion/22'_bipyridyl_modified_bismuth_film_electrode_for_anodic_stripping_voltammetry_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0003-2670(08)00845-3 DB - PRIME DP - Unbound Medicine ER -
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