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.
Highlights
Oxalic acid naturally occurs in various organisms, including fungi, plants and animals
Oxalic acid is a metabolite of the advanced oxidation of phenol and its derivates, and of other aromatic substrates of pesticides, herbicides, and fungicides, which are present in many industrial wastewaters
The Exfoliated graphite (EG)-PS composite electrode with 20 % (w/w) exfoliated graphite contains the clusters of graphite gathered in random areas due to the random distribution and orientation of graphite particles in the polystyrene
Summary
Oxalic acid naturally occurs in various organisms, including fungi, plants and animals. It known that oxalic acid may cause digestive tract irritation and kidney damage, and increasing demand for its determination in urine appeared [1,2,3]. Oxalic acid is a metabolite of the advanced oxidation of phenol and its derivates, and of other aromatic substrates of pesticides, herbicides, and fungicides, which are present in many industrial wastewaters. This compound is known to be recalcitrant and resistant to further degradation [4,5,6]. Most of the methods require a preliminary separation of oxalic acid from its matrix, and exhibit lack of the sensitivity, efficiency or simplicity
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