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Construction and evaluation of a carbon paste electrode modified with polyaniline-co-poly(dithiodianiline) for enhanced stripping voltammetric determination of metal ions

By Vernon Somerset, Bongiwe Silwana, Charlton van der Horst and Emmanuel Iwuoha


A modified carbon paste electrodes (MCPE) have been prepared in this study as an alternative “mercury-free” electrochemical sensor for the determination of Pb2+ and Cd2+ metal ions in aqueous solutions. CPE containing a conducting copolymer of polyaniline-co-poly(2,2'- dithiodianiline) (PANI-co-PDTDA) was used as a modified substrate transducer to achieve enhanced selectivity in stripping voltammetric analysis. The experimental conditions optimised included the supporting electrolyte pH, deposition potential (Ed) and time (td), set at −0.6 V vs. ref. for Pb2+ and −0.8 V for Cd2+; both kept for td = 120 s. The results with the CPE/PANI-co- PDTDA sensor have revealed the linear range within the range of 0.15 – 0.5 μg/L for Pb2+ and the same interval for Cd2+. Finally, the electrode of interest, CPE/PANI-co-PDTDA, can be characterised by the LODs of 0.03 and 0.09 μg/L for Pb2+ and Cd2+ respectively

Topics: carbon paste electrode, PANI-co-PDTDA, differential pulse anodic stripping voltammetry, lead and cadmium, determination
Publisher: 'Univerzita Pardubice'
Year: 2014
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