摘要
将全氟代磺酸脂、石墨烯(graphene)和苯并-18-冠醚-6(B18C6)修饰在玻碳电极(GCE)表面制备出Nafion/石墨烯/苯并-18-冠醚-6复合膜修饰玻碳电极(NA/GN/B18C6/GCE),通过方波阳极溶出伏安法选择性测定蒲公英中草药中痕量Pb^(2+)。在0.1 M pH为4.5的醋酸-醋酸钠缓冲液中对溶液pH值、沉积电位和沉积时间等实验参数进行了优化。NA/GN/B18C6/GCE电极呈现出明晰、可重复和尖锐的溶出峰,在5~60μg/L浓度范围内峰值电流随金属浓度增加呈线性响应,在S/N=3倍条件下Pb^(2+)的检测限为0.04μg/L。将NA/GN/B18C6/GCE电极成功应用于实际蒲公英样品中Pb^(2+)的测定,结果与电感耦合等离子体质谱法(ICP-MS)测定的结果相吻合,表明该电极在电化学分析应用中可有效替代传统铋膜电极。
A glassy carbon electrode(GCE)was modified with Nafion(NA),graphene(GN)and benzo-18-crown-6 to give an electrode(NA/GN/B18C6/GCE)for the selective determination of trace of Pb^(2+) in Chinese medicinal herb dandelion via square wave anodic stripping voltammetry(SWASV).Operational parameters such as solution pH value,deposition potential and deposition time were optimized with respect to the determination of Pb^(2+) in 0.1 M HAc-NaAc buffer solution(pH 4.5).The NA/GN/B18C6/GCE electrode gave well-defined,reproducible and sharp stripping peaks,and the peak current response increased linearly with the metal concentration in a range of 5~60μg/L,with a detection limit of 0.04μg/L under S/N=3 condition.The NA/GN/B18C6/GCE electrode was successfully applied to analysis onPb^(2+) in real dandelion sample and the result was well consistent with determination by inductively coupled plasma mass spectrometer(ICP-MS)technique,suggesting that the electrode can be considered as an effective alternative to the conventional bismuth film electrode for practical use in electrochemical analysis studies.
作者
王艳坤
WANG Yankun(College of Environment Economic, Henan Finance University, Zhengzhou 450046, China)
出处
《河南教育学院学报(自然科学版)》
2022年第1期19-24,共6页
Journal of Henan Institute of Education(Natural Science Edition)
基金
河南省科技攻关项目(212102311111)
河南省高等学校重点科研项目(22B430005)。