Metallo-Graphene Nanocomposite Electrocatalytic Platform for the Determination of Toxic Metal IonsReportar como inadecuado




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Sensor Lab, Department of Chemistry, University of the Western Cape, Bellville 7535, South Africa





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Abstract A Nafion-Graphene Nafion-G nanocomposite solution in combination with an in situ plated mercury film electrode was used as a highly sensitive electrochemical platform for the determination of Zn2+, Cd2+, Pb2+ and Cu2+ in 0.1 M acetate buffer pH 4.6 by square-wave anodic stripping voltammetry SWASV. Various operational parameters such as deposition potential, deposition time and electrode rotation speed were optimized. The Nafion-G nanocomposite sensing platform exhibited improved sensitivity for metal ion detection, in addition to well defined, reproducible and sharp stripping signals. The linear calibration curves ranged from 1 µg L−1 to 7 µg L−1 for individual analysis. The detection limits 3σ blank-slope obtained were 0.07 µg L−1 for Pb2+, Zn2+ and Cu2+ and 0.08 µg L−1 for Cd2+ at a deposition time of 120 s. For practical applications recovery studies was done by spiking test samples with known concentrations and comparing the results with inductively coupled plasma mass spectrometry ICP-MS analyses. This was followed by real sample analysis. View Full-Text

Keywords: Nafion-Graphene nanocomposite; mercury film; trace metals; square-wave anodic stripping voltammetry Nafion-Graphene nanocomposite; mercury film; trace metals; square-wave anodic stripping voltammetry





Autor: Chandre M. Willemse, Khotso Tlhomelang, Nazeem Jahed * , Priscilla G. Baker and Emmanuel I. Iwuoha

Fuente: http://mdpi.com/



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