Determination of components of the Cd(II)-Pb(II)-Cu(II) system in aqueous solutions of (polyethylene imine)methylthiourea by stripping voltammetry |
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| Authors: | E. A. Osipova V. E. Sladkov V. M. Shkinev |
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| Affiliation: | (1) Department of Chemistry, Moscow State University, Leninskie gory, 119899 Moscow, Russia;(2) Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, 117975 Moscow, Russia |
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| Abstract: | Conditions were studied for the stripping voltammetric determination of components of the Cd(II)-Pb(II)-Cu(II) system in aqueous solutions of (polyethylene imine)methylthiourea (PMT), the most efficient polymer complexant for the membrane preconcentration of heavy metal ions. It was shown that PMT significantly enhances the selectivity of determining Pb(II) and Cd(II) in solutions of Cu(II) by stripping voltammetry. Pb(II) and Cd(II) can be determined in the presence of up to 200- and 50-fold amounts of Cu(II), respectively. The limits of detection for Pb(II) and Cd(II) after a 40-s accumulation were 6.9 x 10-8 and 6.8 x 10-7 M, respectively. |
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