Low-potential reduction of sulfite at a ruthenium-oxide hexacyanoferrate modified electrode

被引：23
|
作者：
Montes, Rodrigo H. O. [1 ]
Richter, Eduardo M. [1 ]
Munoz, Rodrigo A. A. [1 ]
机构：
[1] Univ Fed Uberlandia, Inst Quim, Uberlandia, MG, Brazil
来源：
ELECTROCHEMISTRY COMMUNICATIONS | 2012年 / 21卷
关键词：
Sulfite; Ruthenium-oxide hexacyanoferrate; Thin-layer diffusion; Electrocatalysis; FLOW-INJECTION ANALYSIS; THIN-LAYER DIFFUSION; CARBON NANOTUBES; FILMS; BEVERAGES; OXIDATION; KINETICS; FOOD;
D O I：
10.1016/j.elecom.2012.05.005
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The low-potential reduction of sulfite at a ruthenium-oxide hexacyanoferrate (RuOHCF)-modified electrode is reported. A decrease (200 mV) in the overpotential of the sulfite reduction reaction and a substantial current increase (compared to the bare glassy-carbon electrode) were verified. Evidence is found for a mass transport regime which includes a thin-layer diffusional process (sulfite species trapped within the RuOHCF film) responsible for the lowered reductive potential (rather than electrocatalytic properties of the film). The low-potential (-0.2 V vs. Ag/AgCl/saturated KCl) amperometric detection of sulfite in 0.25 mol L-1 HCl was free of interferences from substances typically found in food samples. (C) 2012 Elsevier B.V. All rights reserved.
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页码：26 / 29
页数：4
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