A study of the preconcentration and stripping voltammetry of Pb(II) at carbon electrodes
A study of the preconcentration and stripping voltammetry of Pb(II) at carbon electrodes
Both glassy carbon electrodes and carbon fibre microelectrodes were shown to accumulate Pb2+ ions at open circuit, the amount of Pb2+ accumulated being determined by anodic stripping voltammetry in 0.1 M HCl following the accumulation step. The mechanism of Pb2+ accumulation was investigated by studying the effects of the pH of the solution, the concentration of Pb2+ and the preconcentration time on the amount of Pb2+ accumulated. For a 5 min preconcentration time at open circuit, using a glassy carbon electrode (4 mm diameter) and a carbon fibre microelectrode (8 mm diameter), detection of around 10 nM Pb2+ was obtained for both electrodes. The pH dependence of the amount of Pb2+ accumulated suggests that the Pb2+ ions are complexed by carboxylate groups at the surface of the carbon electrodes. This conclusion is supported by results obtained using basal plane and edge plane pyrolytic graphite electrodes and by studies of the effects of electrochemical oxidation of the glassy carbon surface on the magnitude of the lead stripping peak.
paste, electrochemistry
1135-1138
Bartlett, P. N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Denuault, G.
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Sousa, M. F. B.
867b8883-53b5-47fd-b4d3-927fb69a87af
2000
Bartlett, P. N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Denuault, G.
5c76e69f-e04e-4be5-83c5-e729887ffd4e
Sousa, M. F. B.
867b8883-53b5-47fd-b4d3-927fb69a87af
Bartlett, P. N., Denuault, G. and Sousa, M. F. B.
(2000)
A study of the preconcentration and stripping voltammetry of Pb(II) at carbon electrodes.
Analyst, 125 (6), .
(doi:10.1039/b001124j).
Abstract
Both glassy carbon electrodes and carbon fibre microelectrodes were shown to accumulate Pb2+ ions at open circuit, the amount of Pb2+ accumulated being determined by anodic stripping voltammetry in 0.1 M HCl following the accumulation step. The mechanism of Pb2+ accumulation was investigated by studying the effects of the pH of the solution, the concentration of Pb2+ and the preconcentration time on the amount of Pb2+ accumulated. For a 5 min preconcentration time at open circuit, using a glassy carbon electrode (4 mm diameter) and a carbon fibre microelectrode (8 mm diameter), detection of around 10 nM Pb2+ was obtained for both electrodes. The pH dependence of the amount of Pb2+ accumulated suggests that the Pb2+ ions are complexed by carboxylate groups at the surface of the carbon electrodes. This conclusion is supported by results obtained using basal plane and edge plane pyrolytic graphite electrodes and by studies of the effects of electrochemical oxidation of the glassy carbon surface on the magnitude of the lead stripping peak.
This record has no associated files available for download.
More information
Published date: 2000
Keywords:
paste, electrochemistry
Identifiers
Local EPrints ID: 18896
URI: http://eprints.soton.ac.uk/id/eprint/18896
ISSN: 0003-2654
PURE UUID: 5626ffd5-4ee0-4a20-a03a-a9f80007c1ad
Catalogue record
Date deposited: 19 Jan 2006
Last modified: 16 Mar 2024 02:43
Export record
Altmetrics
Contributors
Author:
M. F. B. Sousa
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
