Microchimica Acta

, Volume 177, Issue 3–4, pp 449–456 | Cite as

Iodide-induced adsorption of lead(II) ion on a glassy carbon electrode modified with ferroferric oxide nanoparticles

Original Paper
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Abstract

Spherical Fe3O4 nanoparticles (NPs) were prepared by hydrothermal synthesis and characterized by scanning electron microscopy and X-ray diffraction. A glassy carbon electrode was modified with such NPs to result in a sensor for Pb(II) that is based on the strong inducing adsorption ability of iodide. The electrode gives a pair of well-defined redox peaks for Pb(II) in pH 5.0 buffer containing 10 mM concentrations of potassium iodide, with anodic and cathodic peak potentials at −487 mV and −622 mV (vs. Ag/AgCl), respectively. The amperometric response to Pb(II) is linear in the range from 0.10 to 44 nM, and the detection limit is 40 pM at an SNR of 3. The sensor exhibits high selectivity and reproducibility.

Figure

An electrochemical sensor for Pb2+ was fabricated based on the glassy carbon electrode modified with Fe3O4 NPs and the strong inducing adsorption ability of I−. The sensor had excellent stability, high sensitivity, ease of construction and utilization for Pb(II) determination

Keywords

Pb2+ I− Fe3O4 nanoparticles Inducing adsorption Amperometric sensor 
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Notes

Acknowledgments

We thank the National Natural Science Foundation of China (grant no. 20775002) for financial support. The work was supported by Program for Innovative Research Team in Anhui Normal University

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.College of Chemistry and Materials Science, Anhui Key Laboratory of chemo-BiosensingAnhui Normal UniversityWuhuPeople’s Republic of China

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