ELECTROCHEMICAL SCIENCE Electrochemically Reduced Graphene Oxide Pencil-Graphite in situ Plated Bismuth-film Electrode for the Determination of Trace Metals by Anodic Stripping Voltammetry release_dignxd2ilzg73d53pdn7xmqbpe

by Keagan Pokpas, Salma Zbeda, Nazeem Jahed, Nuralli Mohamed, Priscilla Baker, Emmanuel Sensorlab

Released as a article-journal .



An electrochemical platform was developed based on a pencil-graphite electrode (PGE) modified with electrochemically reduced graphene oxide (ERGO) sheets and in conjunction with an in situ plated bismuth-film (ERGO-PG-BiE). The ERGO-PG-BiE was used as a sensing platform for determining Zn 2+ , Cd 2+ and Pb 2+ by square wave anodic stripping voltammetry (SWASV). ERGO sheets were deposited on to pencil-graphite electrodes by cyclic voltammetric reduction from a graphene oxide (GO) solution. The GO, with flake thicknesses varying between 1.78 to 2.10 nm (2 sheets) was characterized using FT-IR, HR-SEM, HR-TEM, AFM, XRD and Raman spectroscopy. Parameters influencing the electroanalytical response of the ERGO-PG-BiE such as, bismuth-film concentration, deposition potential, deposition time and rotation speed were investigated and optimized. The ERGO-PG-BiE gave well-defined, reproducible peaks with detection limits of 0.19 µg L-1 , 0.09 µg L-1 and 0.12 µg L-1 for Zn 2+ , Cd 2+ and Pb 2+ respectively, at a deposition time of 120 seconds. For real sample analysis, the enhanced voltammetric sensor proved to be suitable for the detection and quantitation of heavy metals below the US EPA prescribed drinking water standards of 5 mg L-1 , 5 µg L-1 and 15 µg L-1 for Zn 2+ , Cd 2+ and Pb 2+ respectively.
In text/plain format

Archived Files and Locations

application/pdf  524.9 kB
web.archive.org (webarchive)
repository.uwc.ac.za (web)
Read Archived PDF
Preserved and Accessible
Type  article-journal
Stage   unknown
Year   2014
Work Entity
access all versions, variants, and formats of this works (eg, pre-prints)
Catalog Record
Revision: b7296599-0a9f-449c-9db6-7af419c78028