On-line preconcentration and determination of lead and cadmium by sequential injection/anodic stripping voltammetry
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Author list: Ninwong B., Chuanuwatanakul S., Chailapakul O., Dungchai W., Motomizu S.
Publisher: Elsevier
Publication year: 2012
Volume number: 96
Start page: 75
End page: 81
Number of pages: 7
ISSN: 0039-9140
eISSN: 1873-3573
Languages: English-Great Britain (EN-GB)
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Abstract
The highly sensitive determination of lead (Pb(II)) and cadmium (Cd(II)) ions, with a limit of detection of 0.01 μg L-1 for Pb(II) and Cd(II), by on-line preconcentration and anodic stripping voltammetry (ASV) controlled by a sequential injection analysis (SIA) system is reported here. The SIA system consisted of a syringe pump, an 8-port selection valve and a 6-port switching valve and was incorporated with a bismuth coated screen-printed carbon nanotube electrode (Bi-SPCNTE). The preconcentration of metal ions was performed by solid phase extraction using an Analig TE-05 chelating resin mini-column on a switching valve. The metal ions collected were then eluted from the resin with 1 M hydrochloric acid (HCl), deposited on the electrode surface at -1.3 V vs. Ag/AgCl and then measured with ASV. The pH of the sample, eluent volume, flow rate, concentration of the bismuth plating solution and the square-wave voltammetric parameters were optimized. Under the optimum conditions, an enrichment factor of 11.9-fold and 6.6-fold for Pb(II) and Cd(II) ions, respectively, was attained. Detection of Pb(II) and Cd(II) had two different linear ranges (0.5-15 μg L-1 and 15-70 μg L -1). © 2012 Elsevier B.V. All rights reserved.
Keywords
Lead and cadmium, On-line preconcentration, Sequential injection analysis
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