壳聚糖季铵盐修饰电极对硝基苯的测定

Determination of Nitrobenzene by Quaternized Chitosan Modified Electrode

通过共价键合的方法将壳聚糖季铵盐修饰在玻碳电极表面,制备了一种新型的壳聚糖季铵盐修饰电极,用循环伏安法和脉冲伏安法研究了修饰电极的电化学性能。实验结果表明,修饰电极的比表面积显著增大,用于硝基苯检测时,其峰电流明显增强,而且该电极在测试中表现出良好的稳定性和重复性。在pH1.0的Britton-Robinson缓冲溶液中,硝基苯还原峰峰电流与其质量浓度在3.0～120 mg.L-1范围内呈良好的线性关系,检出限达0.7 mg.L-1。

A new modified electrode was prepared based on the glassy carbon electrode（GCE） coating with a film of 2-hydroxypropyltrimethyl ammonium chloride chitosan （HACC） through covalently binding reaction. The electrochemical performance of the modified electrode（HACC/GCE） was studied by cyclic vohaminetry（CV） and differential pulse vohammetry（DPV）. The specific surface area of the modified electrode was increased greatly compared with that of blank electrode. The peak current of HACC/GCE was increased greatly when it was used to determine nitrobenzene. The HACC/ GCE showed good stability and repeatability. There was an excellent linearity between the reduction peak current and the concentration of nitrobenzene in the range of 3.0 - 120 mg·L^-1（r = 0. 999 4） in a Britton - Robinson buffer solution （ pH 1.0） with the detection limit of 0.7 mg·L^-1.