铁氰化镍化学修饰电极对亚硫酸根离子的电催化氧化及其应用

The Eletrocalalytic Oxidation of Sulfite at Nickel Hexacyanoferrate Film Modified Electrode and Its Application

本文采用电化学方法在玻碳(GC)基体上制备出性能稳定的铁氰化镍(NiHCF)修饰膜电极,表征了NiHCF膜的电化学行为,研究了其对SO_3^(2-)离子的电催化氧化作用。结果表明,SO_3^(2-)离子在NiHCF/GC上氧化是受NiHCF媒介作用的,属EC平行催化反应。催化峰电流与SO_3^(2-)离子浓度在1.0×10^(-6)～2.0×10^(-2)mol/L范围内呈线性关系,检测限可达5.0×10^(-7)mol/L。用于测定空气中SO_2含量,结果良好。

A nickel hexacyanoferrate （NIHCF） film, modified glassy carbon （GC） electrode was prepared by electrochemical deposition technique. The film is very stable upon voltammetric scanning in the range of 0.0V to+1.0V（vs.SCE）and an oxidation peak occurs at+0.35V （1mol/L NaCl）. The film shows catalytic activity towards electrooxidation of sulfite with a peak potential of +0.35V, for practical application, the electrode can be used for the determination of sulfite in the range from 1. 0×10-6to 2.0×10-2mol/L, the detection limit is 5.0×10-7mol/L.