葡萄糖在亚硝基五氰合铁酸铁修饰碳糊电极上的电化学行为研究

Study on the Electrochemical Behavior of the FePCNF Modified Carbon Paste Electrode and Its Application on the Detection of Glucose

采用亚硝基五氰合铁酸铁(FePCNF)粉末与碳粉质量比为2∶3混合,制备了FePCNF修饰碳糊电极。研究了FePCNF修饰碳糊电极在KNO3溶液中的电化学行为和扫速、pH值及不同支持电解质的影响。该电极可用于催化氧化检测葡萄糖。实验表明:FePCNF修饰碳糊电极在0.5mol/L KNO3溶液中有一对灵敏的氧化还原峰,峰电流与扫速呈线性关系。氧化峰电流与葡萄糖的浓度在2.0×10-6～2.4×10-5 mol/L之间有良好的线性关系(r=0.9934),检出限为6.3×10-7 mol/L。该电极具有良好的稳定性和重现性,适合于微量葡萄糖的检测。

A FePCNF modified carbon paste electrode was prepared by mixed ferrous pentacyanonitrosylferrate and carbon podwer（2∶3）.The electrochemical behavior of the FePCNF modified carbon paste electrode in 0.5 mol/L KNO3 solution（pH=7.0） was studied.Determination conditions including scan rates,pH values and supporting electrolytes were optimized and an electrochemical method for the detection of glucose was established.The peak current was significantly improved on the modified electrode.The anoidic peak currents were linear straightly with the concentration of glucose in the range of 2.0×10-6~2.4×10-5 mol/L,and the detection limit was 6.3×10-7 mol/L.