Abstract
Abstract Indium sulfide (In2S3) nanoparticles with an average size of ca. 20 nm have been successfully prepared by microwave irradiation. Carbon paste electrode (CPE) was modified with In2S3 and used for the electrochemical oxidation of oxalic acid. Cyclic voltammetry study of the modified electrode indicated that the oxidation potential shifted towards a lower potential by approximately 90 mV and the peak current was enhanced by 2.5-fold in comparison to the bare CPE. The electrochemical behavior was further described by characterization studies of scan rate, pH and concentration of oxalic acid. Using the modified electrode, the calibration curve for oxalic acid was linear in the concentration range from 5.0 × 10−5 to 1.0 × 10−2 mol L−1 with a detection limit of 2.4 × 10−5 mol L−1. Finally, with modified electrode, the content of oxalic acid in spinach was determined.
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