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研究了十六烷基三甲基溴化铵(CTMAB)/多壁碳纳米管修饰玻碳电极的制备以及多巴胺和抗坏血酸在该修饰电极上的电化学行为。在CTMAB和多壁碳纳米管的协同作用下,该修饰电极对多巴胺和抗坏血酸均具有显著的催化氧化作用,多巴胺和抗坏血酸的氧化峰电位分别为223mV和15mV,实现了在抗坏血酸共存时测定多巴胺。在pH7.0的磷酸盐缓冲溶液中,多巴胺和抗坏血酸的线性范围分别为2.0×10-6～2.0×10-3mol/L和4.0×10-5～1.0×10-2mol/L,检出限分别为6.0×10-7mol/L和1.0×10-5mol/L。
The preparation of cetyltrimethylammonium bromide (CTMAB) / multiwalled carbon nanotube modified glassy carbon electrode and the electrochemical behavior of dopamine and ascorbic acid on the modified electrode were studied. Under the synergistic effect of CTMAB and multi-walled carbon nanotubes, the modified electrode has significant catalytic oxidation on both dopamine and ascorbic acid. The oxidation peak potentials of dopamine and ascorbic acid are 223mV and 15mV, respectively. The dopamine can be determined when ascorbic acid coexists. The linear range of dopamine and ascorbic acid was 2.0 × 10-6 ~ 2.0 × 10-3mol / L and 4.0 × 10-5 ~ 1.0 × 10-2mol / L respectively in phosphate buffer solution of pH7.0. The detection limit Respectively 6.0 × 10 -7 mol / L and 1.0 × 10 -5 mol / L.