Graphene-carbon paste electrode for cadmium and lead ion monitoring in a flow-based system
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Author list: Wonsawat W., Chuanuwatanakul S., Dungchai W., Punrat E., Motomizu S., Chailapakul O.
Publisher: Elsevier
Publication year: 2012
Journal: Talanta: The International Journal of Pure and Applied Analytical Chemistry (0039-9140)
Volume number: 100
Start page: 282
End page: 289
Number of pages: 8
ISSN: 0039-9140
eISSN: 1873-3573
Languages: English-Great Britain (EN-GB)
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Abstract
An environment friendly electrode for determining Cd2 and Pb2 levels in an automated flow system was successfully developed. Cyclic voltammetry and square wave anodic stripping voltammetry (SWASV) coupled with sequential injection analysis (SIA) were employed to study the electrochemical behavior of the electrode. The in situ bismuth-modified graphene-carbon paste electrode (Bi-GCPE) exhibited excellent electrooxidation of Cd2 and Pb2 in the automated flow system with a significantly higher peak current for both metal ions compared with the unmodified CPE. The limits of detection from this method were 0.07 and 0.04 μg L-1 for Cd2 and Pb2, respectively, with a linear oxidation peak current response for Cd2 and Pb2 in the range of 0.10-50.0 μg L-1 under optimum conditions. The Bi-GCPE was also applied for the determination of Cd2 and Pb 2 in low- (tap water) and high- (sea bass fish and undulated surf clam tissues) matrix complexity samples by automated flow system. The recoveries were acceptable and ranged from 70.4% to 120% for Cd2 and 65.8% to 113.5% for Pb2. © 2012 Elsevier B.V.
Keywords
Carbon paste electrode, Graphene modified electrode
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