【摘要】 研究了碳纳米管修饰玻碳电极 (NTCME)的制备方法及对多巴胺 (DA)和抗坏血酸 (AA)的电催化氧化作用。在磷酸盐缓冲溶液 (PBSpH 7.4)中 ,以NTCME为工作电极时 ,DA与AA的氧化电位分别为 0 .2 6和 0 .0 1V(vs.SCE) ,比在裸玻碳电极 (GC)上分别降低了 0 .0 7和 0 .6 2V。NTCME能消除DA与AA共存时测定的相互干扰。利用二阶导数卷积伏安法测定 ,DA与AA分别在 2 .0 0× 10 - 6～ 3.84× 10 - 4 和 7.99× 10 - 5～ 3.6 6× 10 - 3 mol L浓度范围内 ,峰高与浓度呈线性关系 ;检出限分别为 1.90× 10 - 7和 5 .96× 10 - 5mol L。更多还原

【Abstract】 The carbon nanotube modified electrode (NTCME) has been prepared and shown significantly electrocatalytic activity to the oxidation of dopamine (DA) and ascorbic acid (AA). On NTCME, the oxidation peak potential of DA and AA are 0.26 V and 0.01 V (vs.SCE) in phosphate buffer solution (PBS pH 7.4) and decreased about 0.07 V and 0.62 V respectively, in comparison with a bare glassy carbon electrode. DA and AA can be simultaneously determined by the second derivative convolution voltammetry. The oxidation peak current of DA and AA were proportional to their concentration in the range 2.00×10 -6 to 3.84×10 -4 mol/L and 7. 99×10 -5 to 3.66×10 -3 mol/L with the detection limit of 1.90×10 -7 mol/L and 5.96×10 -5 mol/L, respectively.更多还原