关键词: 维生素B12, 电化学聚合, 电催化, 亚硝酸根离子, 亚硫酸根离子, 肼

Abstract: Preparation of the VB12 modified electrode and its electrochemical characteristics were studied.The results showed that the VB12 after electroactivated is able to electopolymerize on the GC by cyclic voltammetry(CV)in the DMSO solution.Differential pulse voltmmetry(DPV)showed that the VB12 catalyzed the oxidation of NO2-,SO32-and NH2NH2.The catalytic peak for NO2-on the modified electrode was observed at 0.76V(vs.SCE),but on the unmodified GC which at 1.0V.The catalytic currents increased linearly with the concentration of NO2-from 1.6×10-6 to 4.3×10-4 mol·L-1 with a correlation coefficient of 0.9987.The VB12 modified electrode showed excellent stability and high sensitivity to determined the NO2-in the rains and lake waters with a recovery of 92%~107%.

Key words: VitaminB12, lectopolymerization, catalyzed oxidation, NO2-, SO32-, NH2NH2