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Metallo-Graphene Nanocomposite Electrocatalytic Platform for the Determination of Toxic Metal Ions

A Nafion-Graphene (Nafion-G) nanocomposite solution in combination with an in situ plated mercury film electrode was used as a highly sensitive electrochemical platform for the determination of Zn(2+), Cd(2+), Pb(2+) and Cu(2+) in 0.1 M acetate buffer (pH 4.6) by square-wave anodic stripping voltamm...

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Autores principales: Willemse, Chandre M., Tlhomelang, Khotso, Jahed, Nazeem, Baker, Priscilla G., Iwuoha, Emmanuel I.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Molecular Diversity Preservation International (MDPI) 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3231318/
https://www.ncbi.nlm.nih.gov/pubmed/22163831
http://dx.doi.org/10.3390/s110403970
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author Willemse, Chandre M.
Tlhomelang, Khotso
Jahed, Nazeem
Baker, Priscilla G.
Iwuoha, Emmanuel I.
author_facet Willemse, Chandre M.
Tlhomelang, Khotso
Jahed, Nazeem
Baker, Priscilla G.
Iwuoha, Emmanuel I.
author_sort Willemse, Chandre M.
collection PubMed
description A Nafion-Graphene (Nafion-G) nanocomposite solution in combination with an in situ plated mercury film electrode was used as a highly sensitive electrochemical platform for the determination of Zn(2+), Cd(2+), Pb(2+) and Cu(2+) in 0.1 M acetate buffer (pH 4.6) by square-wave anodic stripping voltammetry (SWASV). Various operational parameters such as deposition potential, deposition time and electrode rotation speed were optimized. The Nafion-G nanocomposite sensing platform exhibited improved sensitivity for metal ion detection, in addition to well defined, reproducible and sharp stripping signals. The linear calibration curves ranged from 1 μg L(−1) to 7 μg L(−1) for individual analysis. The detection limits (3σ blank/slope) obtained were 0.07 μg L(−1) for Pb(2+), Zn(2+) and Cu(2+) and 0.08 μg L(−1) for Cd(2+) at a deposition time of 120 s. For practical applications recovery studies was done by spiking test samples with known concentrations and comparing the results with inductively coupled plasma mass spectrometry (ICP-MS) analyses. This was followed by real sample analysis.
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spelling pubmed-32313182011-12-07 Metallo-Graphene Nanocomposite Electrocatalytic Platform for the Determination of Toxic Metal Ions Willemse, Chandre M. Tlhomelang, Khotso Jahed, Nazeem Baker, Priscilla G. Iwuoha, Emmanuel I. Sensors (Basel) Article A Nafion-Graphene (Nafion-G) nanocomposite solution in combination with an in situ plated mercury film electrode was used as a highly sensitive electrochemical platform for the determination of Zn(2+), Cd(2+), Pb(2+) and Cu(2+) in 0.1 M acetate buffer (pH 4.6) by square-wave anodic stripping voltammetry (SWASV). Various operational parameters such as deposition potential, deposition time and electrode rotation speed were optimized. The Nafion-G nanocomposite sensing platform exhibited improved sensitivity for metal ion detection, in addition to well defined, reproducible and sharp stripping signals. The linear calibration curves ranged from 1 μg L(−1) to 7 μg L(−1) for individual analysis. The detection limits (3σ blank/slope) obtained were 0.07 μg L(−1) for Pb(2+), Zn(2+) and Cu(2+) and 0.08 μg L(−1) for Cd(2+) at a deposition time of 120 s. For practical applications recovery studies was done by spiking test samples with known concentrations and comparing the results with inductively coupled plasma mass spectrometry (ICP-MS) analyses. This was followed by real sample analysis. Molecular Diversity Preservation International (MDPI) 2011-04-01 /pmc/articles/PMC3231318/ /pubmed/22163831 http://dx.doi.org/10.3390/s110403970 Text en © 2011 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
Willemse, Chandre M.
Tlhomelang, Khotso
Jahed, Nazeem
Baker, Priscilla G.
Iwuoha, Emmanuel I.
Metallo-Graphene Nanocomposite Electrocatalytic Platform for the Determination of Toxic Metal Ions
title Metallo-Graphene Nanocomposite Electrocatalytic Platform for the Determination of Toxic Metal Ions
title_full Metallo-Graphene Nanocomposite Electrocatalytic Platform for the Determination of Toxic Metal Ions
title_fullStr Metallo-Graphene Nanocomposite Electrocatalytic Platform for the Determination of Toxic Metal Ions
title_full_unstemmed Metallo-Graphene Nanocomposite Electrocatalytic Platform for the Determination of Toxic Metal Ions
title_short Metallo-Graphene Nanocomposite Electrocatalytic Platform for the Determination of Toxic Metal Ions
title_sort metallo-graphene nanocomposite electrocatalytic platform for the determination of toxic metal ions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3231318/
https://www.ncbi.nlm.nih.gov/pubmed/22163831
http://dx.doi.org/10.3390/s110403970
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