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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Metallo-Graphene nanocomposite electrocatalytic platform for the determination of toxic metal ions
Sensors, Volume 11, No. 4, Year 2011
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Description
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. © 2011 by the authors; licensee MDPI, Basel, Switzerland.
Authors & Co-Authors
Willemse, Chandré M.
South Africa, Bellville
University of the Western Cape
Tlhomelang, Khotso
South Africa, Bellville
University of the Western Cape
Jahed, Nazeem M.
South Africa, Bellville
University of the Western Cape
Baker, P. G.L.
South Africa, Bellville
University of the Western Cape
Iwuoha, Emmanuel Iheanyichukwu
South Africa, Bellville
University of the Western Cape
Statistics
Citations: 134
Authors: 5
Affiliations: 1
Identifiers
Doi:
10.3390/s110403970
Research Areas
Environmental