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

Abstract

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 Na 2 SO 4 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 KMnO 4 titration method. In addition, the apparent diffusion coefficient of oxalic acid D was found to be around 2.89 · 10 -8 cm 2 ·s -1 by CA and CV.

Electrocatalytic applications of a sol–gel derived cobalt phthalocyanine–dispersed carbon–ceramic electrode

“…Although the results obtained are very promising for analytical applications, a major effort must be made in order to improve the detection limit for these analytes by optimizing the experimental conditions. The performance of SiO 2 /SnO 2 /C-graphite/ (SiPy + ) 4 CoPcTs À4 toward oxalic acid oxidation is comparable with other electrode materials previously reported [33,34], but for nitrite two orders of magnitude higher was observed as it is showed in Table 2 [35,36].…”

Simultaneous Determination of 4‐Chlorophenol and Oxalic Acid Using an Expanded Graphite‐Epoxy Composite Electrode

“…The oxidation mechanism of 4-CP and OA on the graphite electrode [10,25] indicated an irreversible and diffusioncontrolled process, which pointed out the slow electron transfer rates for the oxidation of these compounds at the EG-Epoxy electrode. Such slow electron transfer kinetics may be related to the electrode fouling caused by the adsorption of 4-CP and OA, and their oxidation products on the electrode surface, with electropolymerization.…”

Bioelectroanalysis of pharmaceutical compounds

“…An exfoliated graphite-polystyrene composite electrode was used in the determination of oxalic acid in DPV, linear sweep voltammetry and chronoamperometry procedures [230]. Oxalic acid voltammograms were obtained in 0.1 M Na 2 SO 4 , appropriate conditions for each technique.…”