Complexation-based detection of nickel(ii) at a graphene-chelate probe in the presence of cobalt and zinc by adsorptive stripping voltammetry
Loading...
Date
2017
Journal Title
Journal ISSN
Volume Title
Publisher
MDPI
Abstract
The adsorptive stripping voltammetric detection of nickel and cobalt in water samples
at metal film electrodes has been extensively studied. In this work, a novel, environmentally
friendly, metal-free electrochemical probe was constructed for the ultra-trace determination of Ni2+
in water samples by Adsorptive Cathodic Stripping Voltammetry (AdCSV). The electrochemical
platform is based on the adsorptive accumulation of Ni2+ ions directly onto a glassy carbon electrode
(GCE) modified with dimethylglyoxime (DMG) as chelating agent and a Nafion-graphene (NGr)
nanocomposite to enhance electrode sensitivity. The nafion-graphene dimethylglyoxime modified
glassy carbon electrode (NGr-DMG-GCE) shows superior detection capabilities as a result of
the improved surface-area-to-volume ratio and enhanced electron transfer kinetics following the
incorporation of single layer graphene, while limiting the toxic effects of the sensor by removal
of the more common mercury, bismuth and lead films.
Description
Keywords
Chemistry, Graphene, Dimethylglyoxime, World Health Organization (WHO)
Citation
Pokpas, K. et al. (2017). Complexation-based detection of nickel(ii) at a graphene-chelate probe in the presence of cobalt and zinc by adsorptive stripping voltammetry. Sensors , 17(8), 1711. https://doi.org/10.3390/s17081711