Metallo-graphene nanocomposite electrocatalytic platform for the determination of toxic metal ions
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Date
2011
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
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.
Description
Keywords
Nafion-Graphene nanocomposite, Mercury film, Trace metals, Square-wave, Anodic stripping voltammetry
Citation
Willemse, C.M. et al. (2011). Metallo-graphene nanocomposite electrocatalytic platform for the determination of toxic metal ions. Sensors, 11: 3970-3987