摘要
构建了一种基于纳米三氧化二铁修饰玻碳电极的电化学传感器,采用差分脉冲溶出伏安法研究痕量Hg^(2+)在该传感器上的电化学响应行为。实验结果表明,在0.1 mol/L的KCl中,纳米三氧化二铁修饰电极在+0.144 V出现一个强而尖锐的溶出峰,说明修饰电极能有效增强Hg^(2+)的溶出伏安信号。在富集电位-1.2 V,富集时间300 s的最优测试条件下,Hg^(2+)溶出峰电流与其浓度在3~13μg/L的范围内,呈现良好线性关系,线性相关系数r^2=0.993 6,检测限为0.18μg/L。将该电极用于青提汁中的检测,回收率为95.2%~100.7%,表明该制备简单的修饰电极灵敏度高、操作方便,具有良好的实际应用价值。
A nano-Fe2O3 modified glassy carbon electrode was fabricated and the Differential pulse stripping voltammetry behavior of Hg2＋ on this modified electrode was developed.The results indicated the presence of Fe2O3 nanoparticles can effectively enhance the stripping voltammetric response, when a remarkable sharp anodic peak was appeared at 0.144 V in 0.1 mol/L potassium chloride solution. Under the optimum conditions（deposition potential： -1.2 V, deposition time： 300 s）, the stripping peak current was linear with Hg2＋ concentrations in the range of 3 to 13 μg/L, with a respective correlation coefficient of 0.993 6, and a detection limit of 0.18 μg/L. The method could be used to detect Hg2＋ in grape juice, and the recovery was in the range of 95.2~100.7%. The electrode with simple preparation is highly sensitive, and suitable for practical application.
作者
郭佩佩
黄家怿
孟祥宝
唐观荣
Guo Peipei;Huang Jiayi;Meng Xiangbao;Tang Guanrong(Guangzhou Joinken Network Technology Development Co., Ltd., Guangzhou 510630;Guangdong Institute of Modern Agricultural Equipment, Guangzhou 510630)
出处
《现代农业装备》
2018年第2期58-62,共5页
Modern Agricultural Equipment
基金
广州市科技计划项目(201704030023
201604046004)
