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Electrochemical Oxidation and Determination of Oxalic Acid at an Exfoliated Graphite-Polystyrene Composite Electrode
”Politehnica” University of Timisoara, P-ta Victoriei, nr.2, 300006, Timisoara, Romania
West University of Timisoara, Str.Pestalozzi, nr.16, 300115, Romania
Delft University of Technology, 2600 GA Delft, The Netherlands
* Author to whom correspondence should be addressed.
Received: 13 April 2007 / Accepted: 30 April 2007 / Published: 30 April 2007
Abstract: An exfoliated graphite-polystyrene composite electrode was evaluated as analternative electrode in the oxidation and the determination of oxalic acid in 0.1 M Na2SO4supporting electrolyte. Using CV, LSV, CA procedures, linear dependences I vs. C wereobtained in the concentrations range of oxalic acid between 0.5 to 3 mM, with LOD =0.05mM, and recovery degree of 98%, without need of surface renewing between successiveruns. The accuracy of the methods was evaluated as excellent comparing the detection resultswith that obtained using conventional KMnO4 titration method. In addition, the apparentdiffusion coefficient of oxalic acid D was found to be around 2.89 · 10-8 cm2·s-1 by CA andCV.
Keywords: exfoliated graphite-polystyrene composite electrode; oxalic acid; electrochemical oxidation; electrochemical determination
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MDPI and ACS Style
Manea, F.; Radovan, C.; Corb, I.; Pop, A.; Burtica, G.; Malchev, P.; Picken, S.; Schoonman, J. Electrochemical Oxidation and Determination of Oxalic Acid at an Exfoliated Graphite-Polystyrene Composite Electrode. Sensors 2007, 7, 615-627.
Manea F, Radovan C, Corb I, Pop A, Burtica G, Malchev P, Picken S, Schoonman J. Electrochemical Oxidation and Determination of Oxalic Acid at an Exfoliated Graphite-Polystyrene Composite Electrode. Sensors. 2007; 7(4):615-627.
Manea, Florica; Radovan, Ciprian; Corb, Ioana; Pop, Aniela; Burtica, Georgeta; Malchev, Plamen; Picken, Stephen; Schoonman, Joop. 2007. "Electrochemical Oxidation and Determination of Oxalic Acid at an Exfoliated Graphite-Polystyrene Composite Electrode." Sensors 7, no. 4: 615-627.