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Sensors 2008, 8(9), 5806-5819; doi:10.3390/s8095806

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

1
“Politehnica” University of Timisoara, P-ta Victoriei, nr.2, 300006, Timisoara, Romania
2
West University of Timisoara, Laboratory of Electrochemistry, Str. Pestalozzi nr.16, 300115 Timisoara, Romania
3
Delft University of Technology, 2600 GA Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 23 August 2008 / Revised: 13 September 2008 / Accepted: 18 September 2008 / Published: 22 September 2008
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Abstract

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. View Full-Text
Keywords: Urea determination; expanded graphite-Ag-zeolite-epoxy composite electrode; electrocatalytic effect Urea determination; expanded graphite-Ag-zeolite-epoxy composite electrode; electrocatalytic effect
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Manea, F.; Pop, A.; Radovan, C.; Malchev, P.; Bebeselea, A.; Burtica, G.; Picken, S.; Schoonman, J. Voltammetric Detection of Urea on an Ag-Modified Zeolite-Expanded Graphite-Epoxy Composite Electrode. Sensors 2008, 8, 5806-5819.

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