阳极微分脉冲伏安法测定3,4-二氢-2-羟基喹噁啉

3,4-二氢-2-羟基喹(?)啉(简称二氢喹(?)啉)是合成新型有机磷农药及一些喹(?)啉磺胺类药物的中间体.本文根据二氢喹(?)啉可被氧化成2-羟基喹(?)啉的性质,进行了阳极微分脉冲伏安法研究.结果表明,以玻碳电极为工作电极,在甲醇和Britton-Robinson混合液中,二氢喹(?)啉有良好的微分脉冲伏安峰.用此法测定了2-羟基喹(?)啉中二氢喹(?)啉的含量.经循环伏安法验证,电极反应为不可逆反应.

Anodic Differential Pulse Voltammetric Determination of 3,4-Dihydro-2-hydroxyquinoxaline

In Methanol-Britton Robinson buffer solution, 3, 4-dihydro-2-hydroxyquinoxaline showed a definite anodic peak at +0.48 V (vs Ag-AgCl electrode) when a glassy carbon electrode was used as the work electrode.The linear relationship between the peak height and the concentration of 3,4-dihy-dro-2-hydroxyquinoxaline was obtained over the range of 2.8×10^-6～8.0×10^-5 mol/L.The peak potential decreased with decreasing the acidity of the solution.It is proved that the electrode reaction is irreversible.This paper also reports the determination of 3,4-dihydro-2-hydroxyquinoxaline in the intermediate product 2-hydroxyquinoxaline.