Analytical Sciences

Electrochemistry of a ThinCobalt(II)-Heptacyanonitrosylferrate Film Modified Glassy CarbonElectrode

Zhiqiang GAO* * ,Yimin ZHANG**and Guangqing WANG***

*Department of Chemistry, National University of Singapore, Kent RidgeCrescent, Singapore 119260, Republic of Singapore
**Laboratory of Electronic Microscope, Luoyang TechnologicalInstitute, Luoyang, Henan, People's Republic of China
***Department of Chemistry, Yulin Normal Collage, Yulin, Shanxi,People's Republic of China

The electrochemical behavior of acobalt(II)-heptacyanonitrosylferrate (CoHNF) film on a glassy carbonelectrode has been investigated. Cyclic voltammetry shows a singleelectron-transfer reaction taking place at 0.51 V for the modifiedelectrode. The ion effect of the supporting electrolyte indicates that theion permeability in the CoHNF film is mainly determined by the hydratedradius of cation. The modified electrode catalyzes redox reactions of theFe²⁺/Fe³⁺ couple. It also exhibits a linearpotentiometric response over the range of 3x10^-5 -1x10^-2 M NO₂^- with a near-Nernstian slopein an acidic medium. (Keywords: Cobalt, heptacyanonitrosylferrate, chemically modifiedelectrode, voltammetry, electrochemical impedance, nitrite, iron)

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