亚硝酸根在纳米金修饰玻碳电极上的电催化氧化行为及其测定

采用直接电化学沉积法制备出纳米金修饰玻碳电极,研究了其对亚硝酸根的电催化氧化作用。结果表明,亚硝酸根在该修饰电极上于0.8 V处出现了一个良好的氧化峰。在最优实验条件下,亚硝酸根的峰电流与其浓度在2×10-6～2×10-3mol/L范围内呈一定的线性关系,检出限为6.0×10-7(S/N=3),提出了用循环伏安法测定亚硝酸根的方法。纳米金修饰电极用于东莞自来水水样中亚硝酸根的测定,回收率在98.1%～101.4%之间。对比本方法,用分光光度法对东莞自来水样中亚硝酸根进行了测定,结果满意。

Electrochemistry study and determination of nitrite at nano-gold modified glassy carbon electrode

The nano-gold modified glassy carbon electrode(NG/GCE)was prepared by electro-depositon.The electrocatalytic oxidation behavior of nitrite at nano-Au modified glassy carbon electrode was investigated by cyclic voltammetry(CV).The experimental results showed that the resulting electrode exhibited high sensitivity towards the reduction of nitrite.Under the optimal conditions,the cathodic peak current showed a linear relationship with the concentration of nitrite in the range from 2×10-6~2×10-3mol/L with a detection limit of 6.0×10-7 mol/L(S/N=3)and the electrochemical method for the determination of nitrite was established.This method has been applied to the determination of nitrite in water samples in Dongguan City with recoveries of 98.1%~101.4%.The results were in good agreement with those obtained by standard spectrophotometric method.