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利用在玻碳电极上修饰了TiO2-石墨烯-Nafion复合膜制得的修饰电极进行多巴胺(DA)和尿酸(UA)的同时测定。用循环伏安法(CV)和差分脉冲伏安法(DPV)研究了该修饰电极的电化学行为。在pH为7.0的磷酸盐缓冲液(PBS)中,修饰电极对于DA和UA的电化学氧化具有良好的电催化性能。DA和UA的氧化峰电流分别在2～120和60～300μmol/L浓度范围内呈良好的线性关系,检出限分别为0.066和0.102μmol/L。实验结果表明,TiO2-石墨烯-Nafion复合膜修饰电极显著提高了检测的灵敏度,并表现出良好的选择性和重现性。
Simultaneous determination of dopamine (DA) and uric acid (UA) was carried out using a modified electrode modified with TiO2-graphene-Nafion composite membrane on a glassy carbon electrode. The electrochemical behavior of the modified electrode was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The modified electrode has good electrocatalytic activity for the electrochemical oxidation of DA and UA in phosphate buffer (PBS) at pH 7.0. The oxidation peak current of DA and UA showed a good linearity in the range of 2 ~ 120 and 60 ~ 300μmol / L with the detection limits of 0.066 and 0.102μmol / L, respectively. The experimental results show that the TiO2-graphene-Nafion composite film modified electrode significantly improves the detection sensitivity, and shows good selectivity and reproducibility.