Electrochemical Oxidation and Determination of Oxalic Acid at an Exfoliated Graphite-Polystyrene Composite Electrode

Sensors

Florica Manea³  Ciprian Radovan¹  Ioana Corb³  Aniela Pop³  Georgeta Burtica³  Plamen Malchev²  Stephen Picken² 

[1] West University of Timisoara, Str.Pestalozzi, nr.16, 300115, Romania E-mail:;Delft University of Technology, 2600 GA Delft, The Netherlands; E-mail:;”Politehnica” University of Timisoara, P-ta Victoriei, nr.2, 300006, Timisoara, Romania; E-mail:

关键词: exfoliated graphite-polystyrene composite electrode;    oxalic acid;    electrochemical oxidation;    electrochemical determination;   

DOI  :  10.3390/s7040615

来源: mdpi

【 摘 要 】

An exfoliated graphite-polystyrene composite electrode was evaluated as an alternative electrode in the oxidation and the determination of oxalic acid in 0.1 M Na₂SO₄ supporting electrolyte. Using CV, LSV, CA procedures, linear dependences I vs. C were obtained in the concentrations range of oxalic acid between 0.5 to 3 mM, with LOD =0.05 mM, and recovery degree of 98%, without need of surface renewing between successive runs. The accuracy of the methods was evaluated as excellent comparing the detection results with that obtained using conventional KMnO₄ titration method. In addition, the apparent diffusion coefficient of oxalic acid D was found to be around 2.89 · 10^-8 cm²·s^-1 by CA and CV.

【 授权许可】

Unknown   
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