聚三聚氰胺-石墨烯复合膜修饰电极对多巴胺与尿酸的同时测定

采用循环伏安法制备了聚三聚氰胺-石墨烯复合膜修饰电极(poly-(MA)-ERGO/GCE)。研究了抗坏血酸(AA)、尿酸(UA)和多巴胺(DA)在该修饰电极上的电化学行为。结果表明,该修饰电极对AA、UA和DA均有良好的电化学响应,且三者的氧化峰在该修饰电极上可完全分离。据此建立了在大量AA存在下同时测定UA和DA的新方法。在优化条件下,微分脉冲伏安法(DPV)测定UA和DA的线性范围均为1.0×10~(-8)~5.0×10-6mol·L~(-1),检出限(3sb)均为5.0×10~(-9)mol·L~(-1)。

Simultaneous Determination of Dopamine and Uric Acid on Poly-(MA)-ERGO Modified Glassy Carbon Electrode

A poly-(MA)-ERGO hybrid film modified electrode was fabricated by using cyclic voltammommetry.Thc electrochemical behaviors of dopamine (DA),uric acid (UA)and ascorbic acid (AA) were investigated,respectively.The results showed that the modified electrode exhibited an excellent electrocatalytic activity toward the electrooxidation of DA and UA,and had a superior selectivity in the determination of DA,UA in the presence of AA.Under the optimum conditions,the calibration curves for DA and UA were linear in the range of 1.0 × 10-8-5.0 × 10-6 mol · L-1 with the detection limit(3sb)of 5.0 × 10-9 mol · L-1.