Liquid chromatography with electrocatalytic detection of oxalic acid by a palladium-based glassy carbon electrode
1999; Elsevier BV; Volume: 833; Issue: 1 Linguagem: Inglês
10.1016/s0021-9673(98)00998-4
ISSN1873-3778
AutoresInnocenzo G. Casella, Carlo Zambonin, Fabrizio Prete,
Tópico(s)Electrochemical sensors and biosensors
ResumoAbstract Cyclic voltammetry, flow injection analysis and liquid chromatography experiments were performed to characterise a palladium-modified glassy carbon electrode as an amperometric sensor for the determination of oxalic acid in perchloric acid solutions. The effects of several common interferents on the amperometric signal were also evaluated. The electrode stability, precision, limit of detection and linear range were evaluated at a constant applied potential of 1.1 V vs. Ag/AgCl. Calibration plots, obtained using liquid chromatography, were linear from 0.2 μ M to 1.2 m M ( r 2 =0.9986) and the detection limit was 0.15 μ M for a 50-μl injection. An example of analytical application, which includes the chromatographic separation and detection of oxalic acid in human urine, is given.
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