用循环伏安法研究了不同支持电解质溶液中烟酸的电化学行为。烟酸在玻碳电极表面有良好的电化学响应信号。在碱性介质中，烟酸被不可逆氧化，氧化产物具有电活性，可发生准可逆氧化还原反应；在酸性介质中，烟酸发生两步准可逆氧化还原反应。结合红外、紫外光谱分析，提出了烟酸在不同酸度的介质中的电化学反应历程。并根据－０．１３Ｖ处的氧化峰电流与烟酸浓度的关系，提出了电化学测定烟酸的新方法 Cyclic voltammetry was used to study the electrochemical behavior of niacin in different support electrolytes. Niacin has a good electrochemical response at the glassy carbon electrode surface. In alkaline medium, nicotinic acid is irreversibly oxidized, the products of oxidation are electrically active, and quasi-reversible redox reactions can occur. In acid medium, nicotinic acid undergoes two steps of quasi-reversible redox reactions. Combined with infrared and ultraviolet spectroscopy, the electrochemical reaction of nicotinic acid in different acidity media was proposed. Based on the relationship between the oxidation peak current and nicotinic acid concentration at -0.13V, a new electrochemical method for the determination of nicotinic acid