摘要
采用微波辅助加热多元醇技术制备了载铂多壁碳纳米管复合材料,并将该复合材料分散在N,N′-二甲基甲酰胺溶液中得到悬浮液,取14μL悬浮液滴涂在玻碳电极表面,制备铂/多壁碳纳米管修饰电极(Pt/MWCNT′s/GCE)。循环伏安法研究了在0.05mol·L^(-1)硫酸支持电解质中,在0.30～0.70V(vs.SCE)电位范围内,左旋多巴在修饰电极上的电化学行为,结果表明:左旋多巴在Pt/MWCNT′s/GCE上于电位0.548V处可见明显的氧化峰,且氧化峰电流显著高于在MWCNT′s/GCE和裸玻碳电极上的氧化峰电流。提出了用微分脉冲伏安法测定左旋多巴的方法。左旋多巴的浓度在8.0×10^(-6)～2.0×10^(-1)mol·L^(-1)范围内与其氧化峰电流呈线性关系,检出限(3S/N)为1.9×10^(-6)mol·L^(-1),平均回收率为102.8%。
Composite of platinum coated multi-wall carbon nanotubes（Pt-MWCNT＇s）was prepared by the technique of microwave assisted heating of polyhydric alcohol,and Pt-MWCNT＇s modified GCE was prepared by addition of 14μL of suspension of Pt-MWCNT＇s in DMF dropwise onto surface of GCE（designated as Pt-MWCNT＇s/GCE）. Electrochemical behavior of levodopa at the modified electrode was studied by cyclic voltammetry in 0.05 mol·L^-1H2SO4 solution as supporting electrolyte in the potential range of 0.30-0.70 V（vs.SCE）.As shown by the experimental results, a significant oxidation peak was observed at 0.548 V,and the oxidation peak current was found to be higher than that obtained at the MWCNT＇s/GCE and bare GCE.Based on these findings,a selective method for determination of levodopa by differential pulse voltammetry was proposed.Linear relationship between values of oxidation peak current and concentration of levodopa was kept in the range of 8.0×10^-6-2.0×10^-4mol·L^-1.Values of detection limit（3S/N） and average recovery found were 1.9×10^-6mol·L^-1and 102.8%respectively.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2011年第4期435-437,441,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
广西自然科学基金(0832062)资助项目
国家自然科学基金(20665001)
作者简介
李利军（1966-），男，湖北黄梅人，教授，博士，主要研究方向为电化学分析。
