水杨酸在多壁碳纳米管修饰电极上的电化学行为及其测定

Electrochemical Behavior of Salicylic Acid at Multi-wall Carbon Nanotube Modified Electrode and Its Determination

用循环伏安法（CV）研究了水杨酸（SA）在多壁碳纳米管修饰玻碳电极上的电化学行为，并初步探讨了反应机理。实验结果表明，水杨酸在该电极上为一个2e／H^＋的完全不可逆过程。在pH=5．0的磷酸盐缓冲溶液（PBS）中，用循环伏安法在该电极上测定了水杨酸。方法线性范围为2．0×10^-5～1．0×10^-3mol／L，检出限为8．93×10^-6mol／L。将该电极用于药品分析，结果令人满意。

The electrochemical behavior of salicylic acid（SA） at a multi-wall corbon nanotube modified electrode was investigated by cyclic voltammetry in 0. 1 mol/L KH2PO4-NaOH buffer solution. The results showed that SA under went an irreversible reaction involving two electrons and possibly one proton. The linear range for SA was 2 × 10^-5 to 1 × 10^-3 mol/L. The detection limit was 8.93 × 10^-6 mol/L. The electrode was applied to medicine analysis with satisfactory results.