摘要
在玻碳电极上用循环伏安法电聚合一层聚甲苯胺蓝膜,该膜修饰电极对抗坏血酸(VC)的氧化具有良好的电催化作用,能够降低其过电位约100mV。将该修饰电极应用于流动注射能大大提高VC的检测灵敏度,其线性范围为2.0×10-7～1.2×10-3mol·L-1,检出限为4.8×10-8mol·L-1,连续注射检测,其电流信号能够保持稳定24h。
Poly-toluidine blue (PTB) film was chemically modified on glassy carbon electrode by the cyclic voltammetry in a phosphate buffer solution. The PTB film modified electrode exhibited excellent electrocatalytic effect on the oxidation of ascorbic acid in neutral aqueous solution at the electrode with a decrease of overpotential of more than 100mV as compared with that at an un-modified glassy carbon electrode. When the above mentioned modified electrode was used as a detector in a FIA system for determination of ascorbic acid, the sensitivity was raised remarkably and a detection limit of 4.8×10^(-8)mol·L^(-1) was achieved. Linear relationship was held in the range of 2.0×10^(-7)mol·L^(-1) to 1.2×10^(-3)mol·L^(-1) of ascorbic acid at a constant potential of 0.20V ( vs. Ag/AgCl) in 0.1mol·L^(-1) phosphate buffer solution of pH 6.60. Stable response at the electrode was retained in the FIA system during its continuous detection in a period of 24hrs.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2003年第12期691-693,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
