期刊
JOURNAL OF COORDINATION CHEMISTRY
卷 62, 期 1, 页码 130-140出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958970802474839
关键词
Reduction of sulfur compounds; Co(II) porphyrin; Modified electrodes; Electrochemical sensor; Electrocatalysts
资金
- PBCT-Conicyt ACT 24 project
- CONICYT
This article describes the electrochemical reduction of sulfite in water-ethanol mixtures under acidic conditions on a glassy carbon electrode modified with a conducting film formed by Co(II) tetra-3-aminophenyl porphyrin. Rotating disc electrode experiments show a kinetic limitation related with the formation of an adduct between the reduced porphyrin and the sulfur compound. UV-Visible spectroelectrochemical data suggest that Co(I) is not stabilized; thus the adduct should involve a radical species of the porphyrin. However, the resulting modified electrode is stable and shows a linear relationship between current and concentration of the sulfur species at pH 1. The detection range of sulfite by the modified electrode goes from 12 to 150 mg L-1. The detection limit is 4.15 mg L-1.
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