摘要
制备了多壁碳纳米管修饰碳黑微电极,研究了多巴胺(DA)和抗坏血酸(AA)在该修饰电极上的电化学行为。实验表明,在pH 7.0的PBS缓冲溶液中,该修饰电极对DA和AA均具有显著的催化氧化作用,AA与DA的氧化电位分别为30 mV和280 mV(vs.SCE)。利用二次导数线性扫描伏安法测定,DA与AA的线性范围分别为6.0×10^(-9)2.0×10^(-4)mol/L和2.0×10^(-7)1.0×10^(-3) mol/L,检出限为2.0×10^(-9)mol/L和1.0×10^(-7)mol/L。方法已用于人工合成样品的分析。
The carbon black microeleetrode modified with the multi-walled carbon nanotube had been prepared and the electrochemical behaviors of dopamine （DA） and ascorbic acid （AA） at the modified electrode were investigated. The experimental results showed that in phosphate buffer solution （PBS pH 7.0） the modified electrode has strong catalytic effect towards the electrochemical oxidation of DA and AA. The oxidation peak potential of AA and DA are 30 mV and 280 mV （vs. SCE）. The linear ranges for the determination of DA and AA were 6.0 ×10^-9 ～ 2.0 ×10^-4 mol/L and 2.0 ×10^-7 ~ 1.0 ×10^-3 mol/L with the detection limits of 2.0 ×10^-9 mol/L and 1.0 ×10^-7 mol/L respectively when the second derivative linear sweep technique was used. The determination of DA and AA in samples was evaluated and the results were satisfactory.
出处
《分析试验室》
CAS
CSCD
北大核心
2009年第1期92-95,共4页
Chinese Journal of Analysis Laboratory
关键词
碳纳米管
修饰电极
多巴胺
抗坏血酸
伏安法
Carbon nanotubes
Modified electrode
Dopamine
Ascorbic acid
Vohammetry
