Abstract
Metal foils made of Pt and Ni show amperometric responses to ascorbic acid (H 2A). This study compares the sensitivity of a Pt foil electrode to that of a Ni foil electrode. Both electrodes were highly sensitive to H 2A; the Pt foil electrode was more sensitive at an applied potential of 0.2 V vs. Ag/AgCl in KOH than it was in H 2SO 4 and Na 2SO 4. These electrodes showed excellent selectivity for H 2A over glucose, fructose, sucrose, tartaric acid, citric acid, oxalic acid, and sodium benzoate. Both electrodes displayed rapid responses and good linearity levels in the range from 0.57 to 5.68 mM. Compared to the Ni foil electrode, the Pt foil electrode possessed better long-term stability, because it maintained 99% of its initial sensitivity for more than 67 days.
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