摘要:
硝基苯在碳纳米管修饰电极上的电化学行为表明,硝基苯在-0.50V有一灵敏的还原峰,为硝基苯得到四个电子还原为苯胲所形成,电位继续负移,苯胲能继续还原为苯胺.在扫描速度为100mV·s-1,pH=5.0和富集时间为2min的条件下,-0.50V处的还原峰电流与硝基苯在1.5—150mg·l-1范围内线性关系良好,线性系数为0.99992,检测限为0.3mg·l-1.应用于实际废水中硝基苯的测定,相对标准偏差小于5%(n=10),相对误差为-5%—+5%.
Abstract:
The electrochemical behavior of nitrobenzene at multi-wall carbon nanotubes modified carbon paste electrode was studied.Asensitive cathodic peak of nitrobenzene at multi-wall carbon nanotubes modified electrode was obtained at around -0.50V,due to four-electron reduction of nitrobenzene to phenylhydroxylamine. Phenylhydroxylamine was reduced to aniline via a two-electron process, with the potential being more negative. The optimized analytical conditions were obtained, with scan rate 100mV·s-1, pH =5 and accumulation time 2 min. Under the optimized conditions the cathodic peak current (at –0.50V)was linearly proportional to the concentration of nitrobenzene in the range of 1.5—150mg·l-1, and a detection limit of 0.3mg·l-1 was obtained.The satifying precision with RSD5% and accurcy with relative error range of -5%—+5% were obtained by using the method to determine nitrobenzene in wastewater.
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