Simultaneous electrochemical determination of trace amounts of Cd2+ and Pb2+ ions using thiolated polyaniline nanofiber modified glassy carbon electrodes

Huang Hui; Wang Chunlei; Zhu Wencai; Ma Houyi

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Simultaneous electrochemical determination of trace amounts of Cd2+ and Pb2+ ions using thiolated polyaniline nanofiber modified glassy carbon electrodes

Huang Hui,Wang Chunlei,Zhu Wencai,Ma Houyi *

School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100, China

*Correspondence author

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Funding: National Research Foundation for the Doctoral Program of Higher Education of China （No.20120131110009）, National Science Foundation of China（No.21373129, 21175059）

Opened online:13 June 2016

Accepted by: none

Citation: Huang Hui,Wang Chunlei,Zhu Wencai.Simultaneous electrochemical determination of trace amounts of Cd2+ and Pb2+ ions using thiolated polyaniline nanofiber modified glassy carbon electrodes[OL]. [13 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4696479

Stable and highly dispersed polyaniline (PANI) nanofiber aqueous colloids prepared via a facile chemical method were used to modify glassy carbon electrodes (GCEs), with the help of mercaptosuccinic acid (MSA). Due to the effective combination of the good conductivity and network structure of PANI nanofibers with the complexing capacity of MSA, the resulting modified electrodes could be used to sensitively and simultaneously determine trace amounts of Cd2+ and Pb2+ ions by means of differential pulse anodic stripping voltammetry (DPASV), with the outstanding preconcentration efficiency and detection sensitivity. The linear calibration curve for Pb2+ ions ranged from 0.2 to 50 μg L-1 and that for Cd2+ions from 1.0 to 100 μg L-1; the corresponding detection limits (S/N = 3) were 0.1 μg L-1 for Pb2+ and 0.5 μg L-1 for Cd2+ respectively. In particular, the thiolated PANI nanofiber modified GCEs were successfully applied to the simultaneous detection of Cd2+ and Pb2+ ions in waste water samples. The present study provides a new path for fabricating high performance modified electrodes suitable for the highly sensitive and simultaneous determination of trace amounts of heavy metal ions in aqueous solutions.

Keywords:Polyaniline nanofibers; Cadmium ion; Lead ion; Electrochemical detection; Modified electrode

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