Cyclic voltammetry, how 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 mu M to 1.2 mM (r(2) = 0.9986) and the detection limit was 0.15 mu M for a 50-mu l injection. An example of analytical application, which includes the chromatographic separation and detection of oxalic acid in human urine, is given.
LIQUID CHROMATOGRAPHY WITH ELRECTROCATALYTIC DETECTION OF OXALIC ACID BY A PALLADIUM-BASED GLASSY CARBON ELECTRODE.
CASELLA, Innocenzo Giuseppe;
1999-01-01
Abstract
Cyclic voltammetry, how 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 mu M to 1.2 mM (r(2) = 0.9986) and the detection limit was 0.15 mu M for a 50-mu l injection. An example of analytical application, which includes the chromatographic separation and detection of oxalic acid in human urine, is given.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
