摘要
采用电化学沉积法在酸性溶液中制备核固红（NFR）修饰玻碳电极,循环伏安法研究核固红膜的电化学性质,核固红膜在PBS（pH=2.45）中,Epa=-0.31 V,Epc=-0.36 V;当扫描速度v〈200 mV.s^-1时,核固红膜峰电流与v呈线性关系,且Ipa/Ipc≈1,符合可逆过程的特征。核固红修饰电极对抗坏血酸（AA）、多巴胺（DA）和尿酸（UA）具有显著的电催化作用,差分脉冲伏安结果表明,AA、DA和UA浓度分别在6.5×10^-5-2×10^-3mol.L^-1,5×10^-7-2×10^-5mol.L^-1和6×10^-5-1×10^-3mol.L^-1范围内其氧化峰电流与各自的浓度呈线性关系,而且AA、DA和UA混合物在核固红修饰电极表现出良好的分离伏安峰,可实现对三种物质的同时测定。
A stably modified glassy carbon electrode in acidic solution has been fabricated by electrodeposition of nuclear fast red （ NFR）, and its electrochemical behaviors were investigated by cyclic vohammetry. In the PBS with pH = 2.45, cyclic vohammogram of the nuclear fast red film modified glassy carbon electrode exhibited a pair of redox peaks at Epa=-0.31 V,Epc=-0.36 V under the scan rate of 200 mV · s^-1, and the ratio of redox peak currents Ipa/Ipc≈1, which indicates that the redox process is reversible. The nuclear fast red film modified glassy carbon electrode exhibited excellent electrocatalytic activities towards the oxidation of ascorbic acid （ AA）, dopamine （ DA）, and uric acid （UA） in PBS （ pH = 6.86）. The differential pulse vohammetry （DPV） peak currents obtained increased linearly with the concentrations of AA,DA and UA in the range of 6.5×10^-5to2×10^-3mol.L^-1 ,5×10^-7-2×10^-5mol.L^-1and 6×10^-5-1×10^-3mol.L^-1 ,respectively. This modified electrode was quite effective to detect AA,DA and UA in simultaneous determination of these species in a mixture.
出处
《济南大学学报（自然科学版）》
CAS
北大核心
2009年第4期393-397,共5页
Journal of University of Jinan(Science and Technology)
基金
济南大学科研基金(Y0412)
关键词
核固红
化学修饰电极
抗坏血酸
多巴胺
尿酸
nuclear fast red
chemical modified electrode
ascorbic acid （AA）
dopamine （ DA ）
uric acid （UA）
作者简介
杨秋霞（1965-），女，山东阳谷人，副教授，硕士。
