多壁碳纳米管修饰电极测定烟酰胺

研究多壁碳纳米管修饰电极的制备及其对烟酰胺的电催化检测。考察支持电解质种类、酸度和扫速等因素对烟酰胺响应的影响。在优化实验条件下，采用示差脉冲伏安法测定烟酰胺，其浓度在5.0×10-5～1.0×10-3mol/L范围内与其还原峰电流呈良好的线性关系，检出限为2.49×10-5mol/L。共存的多种离子、蔗糖、乙醇等不干扰测定。

Determination of Nicotinamide on Glassy Carbon Electrode Modified with Multiwall Carbon Nanotubes

A multi-walled carbon nanotubes modified electrode was fabricated and its electro-catalytic activity for nicotinamide was investigated. The effects of electrolyte type and acidity, scanning rate on the voltammetric behavior of nicotinamide were studied to acquire optimal conditions for detecting nicotinamide. In 0.1 mol/L phosphate buffer (pH 6.8), the differential pulse voltammetric determination displayed excellent linearity between reduction current and nicotinamide concentration in the range of 5.0×10-5 to 1.1×10-3 mol/L with a detection limit of 2.49×10-5 mol/L. Several ions, sugar and ethanol did not interfere with the determination.