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Chitosan Modified Screen-Printed Carbon Electrode for Sensitive Analysis of Heavy Metals

机译：壳聚糖修饰的丝网印刷碳电极用于重金属的灵敏分析

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The chitosan-modified screen-printed carbon electrode was used as a working electrode for thedetermination of selected metals: Pb, Cu, Cd and Hg. In 0.1 M HCl/KCl medium. Thechlorocomplexes of these elements form ion-associates with the protonated amino group in thechitosan molecule at the electrode surface, then the resulting accumulated metals were stripped offusing differential pulse anodic stripping voltammetry. The experimental conditions were optimizedwith respect to homemade printing ink composition, chitosan content, preconcentration time and scanrate. With 30 s preconcentration time, limit of detection values were 3.4, 5, 5 and 2 ng mL-1, for Pb,Cu, Cd and Hg, respectively. The relative standard deviation for measuring Pb2+ was 4.1 % (n = 5)using the same electrode and 7 % (n=15) with different electrodes in the same batch. The screen- printed electrodes exhibit adequate shelflife (6 months). There was no interference from Cd, Tl, Zn,Cu, Bi, Sb, Fe, Co, Au, Al, As, Pt, and Mn in Pb2+ determination while Sn showed significantinterference. The developed screen-printed carbon electrodes modified with chitosan were successfullyemployed for the determination of Pb2+ in spiked tape water sample, holding a great promise fordecentralized testing of heavy metals.
机译：壳聚糖改性的丝网印刷碳电极被用作测定所选金属：Pb，Cu，Cd和Hg的工作电极。在0.1 M HCl / KCl介质中。这些元素的氯配合物在电极表面与壳聚糖分子中的质子化的氨基形成离子缔合，然后使用差分脉冲阳极溶出伏安法将所得的累积金属去除。关于自制印刷油墨的组成，壳聚糖含量，预浓缩时间和扫描速度，对实验条件进行了优化。在30 s的预浓缩时间下，铅，铜，镉和汞的检出限分别为3.4、5、5和2 ng mL-1。使用同一电极使用同一批电极测量Pb2 +的相对标准偏差为4.1％（n = 5），使用不同电极测量为7％（n = 15）。丝网印刷的电极具有足够的保质期（6个月）。在测定Pb2 +时，没有Cd，Tl，Zn，Cu，Bi，Sb，Fe，Co，Au，Al，As，Pt和Mn的干扰，而Sn表现出明显的干扰。壳聚糖修饰的已开发的丝网印刷碳电极已成功用于测定加标带状水样品中的Pb2 +，为重金属的分散测试具有广阔的前景。

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