Abstract
We report on a glassy carbon electrode (GCE) modified with a lead ionophore and multiwalled carbon nanotubes. It can be applied to square wave anodic stripping voltammetric determination of Pb(II) ion after preconcentration of Pb(II) at −1.0 V (vs. SCE) for 300 s in pH 4.5 acetate buffer containing 400 μg L−1 of Bi(III). The ionophore-MWCNTs film on the GCE possesses strong and highly selective affinity for Pb(II) as confirmed by quartz crystal microbalance experiments. Under the optimum conditions, a linear response was observed for Pb(II) ion in the range from 0.3 to 50 μg L−1. The limit of detection (at S/N = 3) is 0.1 μg L−1. The method was applied to the determination of Pb(II) in water samples with acceptable recovery.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (90713018, 21075036, 21175042, 20875029), the State Special Scientific Project on Water Treatment (2009ZX07212-001-06), the Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province, and State Key Laboratories of Chemo/Biosensing and Chemometrics (200902) and of Electroanalytical Chemistry.
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He, X., Chen, L., Xie, X. et al. Square wave anodic stripping voltammetric determination of lead(II) using a glassy carbon electrode modified with a lead ionophore and multiwalled carbon nanotubes. Microchim Acta 176, 81–89 (2012). https://doi.org/10.1007/s00604-011-0697-x
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DOI: https://doi.org/10.1007/s00604-011-0697-x