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Disposable Screen-printed Bismuth Electrode Modified with Multi-walled Carbon Nanotubes for Electrochemical Stripping Measurements

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Abstract

Integrating the advantages of screen printing technology with the encouraging electroanalytical characteristic of metallic bismuth, we developed an ultrasensitive and disposable screen-printed bismuth electrode (SPBE) modified with multi-walled carbon nanotubes (MWCNTs) for electrochemical stripping measurements. Metallic bismuth powders and MWCNTs were homogeneously mixed with graphite-carbon ink to mass-prepare screen-printed bismuth electrode doped with multi-walled carbon nanotubes (SPBE/MWCNT). The electroanalytical performance of the prepared SPBE/MWCNT was intensively evaluated by measuring trace Hg(II) with square-wave anodic stripping voltammetry (SWASV). The results indicated that the SPBE modified with 2 wt% MWCNTs could offer a more sensitive response to trace Hg(II) than the bare SPBE. The stripping current obtained at SPBE/MWCNT was linear with Hg(II) concentration in the range from 0.2 to 40 µg/L (R2 = 0.9976), with a detection limit of 0.09 µg/L (S/N = 3) under 180 s accumulation. The proposed “mercury-free” electrode, with extremely simple preparation and ultrahigh sensitivity, holds wide application prospects in both environmental and industrial monitoring.

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Correspondence to Minbo Lan.

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Niu, X., Zhao, H. & Lan, M. Disposable Screen-printed Bismuth Electrode Modified with Multi-walled Carbon Nanotubes for Electrochemical Stripping Measurements. ANAL. SCI. 27, 1237–1241 (2011). https://doi.org/10.2116/analsci.27.1237

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  • DOI: https://doi.org/10.2116/analsci.27.1237

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