嵌入式碳纳米管铋膜电极微分电位溶出法测定民族药中微量铅

Determination of lead in ethnic medicine by differential potentiometric stripping analysis using inlaid CNT-modified electrode

目的:建立嵌入式碳纳米管玻碳电极测定微量铅测定中的应用。方法:把碳纳米管膜嵌入到玻碳电极表面,用其作为工作电极并与铋膜法相结合,采用微分电位溶出法测定微量铅的含量。结果:与玻碳电极相比,碳纳米管修饰电极能明显提高灵敏度和稳定性。三七根、竹叶兰、青竹标中均含一定量的铅。方法的最低检出浓度为0.6000μg.L-1,加标回收率93.9%～108.8%,RSD为2.79%～8.60%。结论:嵌入式碳纳米管玻碳电极具有准确、高灵敏度、稳定性更高等特点,能被用于其它微量元素的测定。

Objective：To establish a novel differential potentiometric stripping analysis method to detect trace lead in using inlaid CNT-modified electrode.Methods：Carbon electrode was modified by inlaid CNT-modified electrode and stripping.Results：The sensitivity was improved obviously with inlaid CNT-modified electrode compared with bared carbon electrode,and stability improved obviously.They contains some lead element.The experimental results showed that the detection limits was 0.6000 μg·L-1,the addition standard recovery（ASR）was 93.9%-108.8%,and the RSD was 2.79%-8.60% for Pb.Conclusion：Inlaid CNT-modified electrode is accurate,high sensitivity,stability higher etc,can be used in the determination of trace element.