摘要
用羧基化碳纳米管修饰玻碳电极制备了一种新型的碳纳米管修饰电极(A)。利用循环伏安,交流阻抗法对A进行了表征。用线性扫描伏安(LSV)法研究了A对Vc的电催化行为,结果表明,在0.1 mol.L-1的醋酸缓冲液(pH5.8)中,当Vc在A表面于-1.0 V电位下富集30 s,电位扫速为100 mV.s-1时,Vc在LSV图上能出现一灵敏的电催化氧化峰,峰电位约为0.149 V;利用该氧化峰可以进行痕量Vc的测定;峰电流与Vc浓度在1.0×10-5mol.L-1～1.0×10-3mol.L-1内成良好线关系,其相关系数为0.996,检出限达1.0×10-6mol.L-1;A稳定性较好,可用于水果和蔬菜中Vc的现场快速检测,回收率96.0%～103.0%。
A novel carboxylic carbon nanotubes modified electrode（A） was prepared by carboxylic multi-walled carbon nanotubes modified glass carbon electrode.A was characterized by cyclic voltammetry and alternating current impedance.The electrocatalytic property of A on Vc was investigated by linear sweep voltammetry.The experimental results showed that there was a sensitive oxidation peak on voltammogram and the peak potential was about 0.149 V when accumulation time of Vc at A surface was 30 s at-1.0 V and potential scan rate was 100 mV·s^-1 in 0.1 mol·L^-1 acetic acid buffer solution（pH 5.8）.The trace Vc could be determined by this peak.There was a good linear relationship between the peak current and Vc concentration in 1.0×10^-5 mol·L^-1～ 1.0×10^-3 mol·L^-1 with a correlation coefficient of 0.996,and the detection limit was 1.0×10^-6 mol·L^-1.A had better stability and could be applied to the quick determination of Vc in fruit and vegetable samples,and the recovery was from 96.0% to 103.0%.
出处
《合成化学》
CAS
CSCD
北大核心
2010年第4期437-440,共4页
Chinese Journal of Synthetic Chemistry
基金
湖南省"十一五"重点学科资助项目(2006180)
湖南省重点实验室开放基金资助项目
衡阳市科技局工业科技支持项目(2009KG23
2009KG50)
关键词
碳纳米管
修饰电极
伏安法
VC
carbon nanotubes
modified electrode
voltammetry
Vc
