Lead (II) carbon paste electrode based on derivatized multi-walled carbon nanotubes: Application to lead content determination in environmental samples |
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Authors: | Junxiang GuoAuthor VitaeYaqin ChaiAuthor Vitae Ruo YuanAuthor VitaeZhongju SongAuthor Vitae Zhifen ZouAuthor Vitae |
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Affiliation: | Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China |
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Abstract: | For the first time a novel derivatized multi-walled carbon nanotubes-based Pb2+ carbon paste electrode is reported. The electrode with optimum composition, exhibits an excellent Nernstian response to Pb2+ ion ranging from 5.9 × 10−10 to 1.0 × 10−2 M with a detection limit of 3.2 × 10−10 M and a slope of 29.5 ± 0.3 mV dec−1 over a wide pH range (2.5-6.5) with a fast response time (25 s) at 25 °C. Moreover, it also shows a high selectivity and a long life time (more than 3 months). Importantly, the response mechanism of the proposed electrode was investigated using AC impedance technique. Finally, the electrode was successfully applied for the determination of Pb2+ ion concentration in environmental samples, e.g. soils, waste waters, lead accumulator waste and black tea, and for potentiometric titration of sulfate anion. |
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Keywords: | Carbon paste electrode Lead Multi-walled carbon nanotubes (MWCNTs) Derivates Environmental samples |
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