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Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode

In this paper, a modified expanded graphite composite electrode based on natural zeolitic volcanic tuff modified with silver (EG-Ag-Z-Epoxy) was developed. Cyclic voltammetry measurements revealed a reasonably fast electron transfer and a good stability of the electrode in 0.1 M NaOH supporting elec...

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Autores principales: Manea, Florica, Pop, Aniela, Radovan, Ciprian, Malchev, Plamen, Bebeselea, Adriana, Burtica, Georgeta, Picken, Stephen, Schoonman, Joop
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Molecular Diversity Preservation International (MDPI) 2008
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705531/
https://www.ncbi.nlm.nih.gov/pubmed/27873841
http://dx.doi.org/10.3390/s8095806
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author Manea, Florica
Pop, Aniela
Radovan, Ciprian
Malchev, Plamen
Bebeselea, Adriana
Burtica, Georgeta
Picken, Stephen
Schoonman, Joop
author_facet Manea, Florica
Pop, Aniela
Radovan, Ciprian
Malchev, Plamen
Bebeselea, Adriana
Burtica, Georgeta
Picken, Stephen
Schoonman, Joop
author_sort Manea, Florica
collection PubMed
description In this paper, a modified expanded graphite composite electrode based on natural zeolitic volcanic tuff modified with silver (EG-Ag-Z-Epoxy) was developed. Cyclic voltammetry measurements revealed a reasonably fast electron transfer and a good stability of the electrode in 0.1 M NaOH supporting electrolyte. This modified electrode exhibited moderate electrocatalytic effect towards urea oxidation, allowing its determination in aqueous solution. The linear dependence of the current versus urea concentration was reached using square-wave voltammetry in the concentrations range of urea between 0.2 to 1.4 mM, with a relatively low limit of detection of 0.05 mM. A moderate enhancement of electroanalytical sensitivity for the determination of urea at EG-Ag-Z-Epoxy electrode was reached by applying a chemical preconcentration step prior to voltammetric/amperometric quantification.
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spelling pubmed-37055312013-07-09 Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode Manea, Florica Pop, Aniela Radovan, Ciprian Malchev, Plamen Bebeselea, Adriana Burtica, Georgeta Picken, Stephen Schoonman, Joop Sensors (Basel) Article In this paper, a modified expanded graphite composite electrode based on natural zeolitic volcanic tuff modified with silver (EG-Ag-Z-Epoxy) was developed. Cyclic voltammetry measurements revealed a reasonably fast electron transfer and a good stability of the electrode in 0.1 M NaOH supporting electrolyte. This modified electrode exhibited moderate electrocatalytic effect towards urea oxidation, allowing its determination in aqueous solution. The linear dependence of the current versus urea concentration was reached using square-wave voltammetry in the concentrations range of urea between 0.2 to 1.4 mM, with a relatively low limit of detection of 0.05 mM. A moderate enhancement of electroanalytical sensitivity for the determination of urea at EG-Ag-Z-Epoxy electrode was reached by applying a chemical preconcentration step prior to voltammetric/amperometric quantification. Molecular Diversity Preservation International (MDPI) 2008-09-22 /pmc/articles/PMC3705531/ /pubmed/27873841 http://dx.doi.org/10.3390/s8095806 Text en © 2008 by the authors; licensee Molecular Diversity Preservation International, 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
Manea, Florica
Pop, Aniela
Radovan, Ciprian
Malchev, Plamen
Bebeselea, Adriana
Burtica, Georgeta
Picken, Stephen
Schoonman, Joop
Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode
title Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode
title_full Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode
title_fullStr Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode
title_full_unstemmed Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode
title_short Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode
title_sort voltammetric detection of urea on an ag-modified zeolite-expanded graphite-epoxy composite electrode
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705531/
https://www.ncbi.nlm.nih.gov/pubmed/27873841
http://dx.doi.org/10.3390/s8095806
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