Journal
MICROCHIMICA ACTA
Volume 169, Issue 1-2, Pages 57-64Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-009-0287-3
Keywords
Lead; Mesoporous silica; Chemically modified; carbon paste electrode; Adsorptive stripping voltammetry
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Funding
- Comunidad de Madrid and URJC [URJC-CM-2007CET-1491]
- Ministerio de Ciencia e Innovacion [CTQ2008-05821/PPQ]
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A hexagonal mesoporous silica (HMS) functionalized with a 5-mercapto-1-methyltetrazole derivative was employed to prepare a chemically modified carbon paste electrode for Pb(II) detection in aqueous solution by square wave adsorptive stripping voltammetry. The optimal operating conditions were 5 min preconcentration time at pH 6.5, and 120 s electrolysis time in 0.2 mol L-1 HCl. Under these conditions, the voltammetric signal increased linearly with the preconcentration time in the range 1 to 10 min and with the Pb(II) concentration in the range 1 to 100 A mu g L-1. The electrode was reproducible and sensitive. Simultaneous determination of Pb, Cd and Cu was also carried out with the electrode. The accuracy of the method was validated by analysing Pb(II) in tap water and groundwater samples.
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