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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Main Authors:	Manea, Florica, Pop, Aniela, Radovan, Ciprian, Malchev, Plamen, Bebeselea, Adriana, Burtica, Georgeta, Picken, Stephen, Schoonman, Joop
Format:	Online
Language:	English
Published:	Molecular Diversity Preservation International (MDPI) 2008
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705531/

id	pubmed-3705531
recordtype	oai_dc
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 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/).
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Manea, Florica Pop, Aniela Radovan, Ciprian Malchev, Plamen Bebeselea, Adriana Burtica, Georgeta Picken, Stephen Schoonman, Joop
spellingShingle	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
author_facet	Manea, Florica Pop, Aniela Radovan, Ciprian Malchev, Plamen Bebeselea, Adriana Burtica, Georgeta Picken, Stephen Schoonman, Joop
author_sort	Manea, Florica
title	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_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_sort	voltammetric detection of urea on an ag-modified zeolite-expanded graphite-epoxy composite electrode
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.
publisher	Molecular Diversity Preservation International (MDPI)
publishDate	2008
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705531/
_version_	1611993182872010752

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

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