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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 an embedded carbon nanotube glassy carbon electrode for the determination of trace lead. Methods: The carbon nanotube film was embedded in the surface of glassy carbon electrode, which was used as a working electrode and bismuth film combined with differential potentiometric stripping method for the determination of trace lead content. Results: Compared with glassy carbon electrode, carbon nanotube modified electrode can significantly improve the sensitivity and stability. Panax, bamboo leaves blue, green bamboo standard contains a certain amount of lead. The minimum detectable concentration was 0.6000μg.L-1, the spiked recoveries ranged from 93.9% to 108.8%, and the RSDs ranged from 2.79% to 8.60%. Conclusion: The carbon nanotube glassy carbon electrode has the characteristics of high accuracy, high sensitivity and stability and can be used for the determination of other trace elements.