Metal Complexation with Different types of Soluble and Adsorbed Freshwater Ligands Followed by DPASV |
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| Authors: | Cidália Maria Sousa Botelho Rui Alfredo Rocha Boaventura Maria de Lurdes Sadler Simões Gonçalves |
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| Institution: | (1) Departamento de Engenharia Química, Faculdade de Engenharia, LSRE – Laboratory of Separation and Reaction Engineering, Rua Roberto Frias, Porto, 4200-465, Portugal;(2) Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, Lisboa, 1049-001, Portugal |
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| Abstract: | In order to understand metal speciation in a polluted river (Este River, Northern Portugal) filtrate, freeze dried particles
and organics desorbed from surfaces were titrated with Cd(II) and Zn(II), followed by differential pulse anodic stripping
voltammetry (DPASV). The obtained results are compared with those previously published for Pb(II) and Cu(II). Due to the heterogeneity
of the system, a continuous and a discrete ligand model were used to interpret the titration data. Two types of ligands could
be detected and quantified by the discrete ligand model: small molecules with high affinities for cations such as Cd(II),
Cu(I), and Zn(II) and macromolecules with higher affinities for Pb(II) and Cu(II). Small ligands were strongly adsorbed onto
the particles, as inferred from the desorption of Zn(II) during titration with Pb(II) and Cd(II). The total concentrations
of the different ligands and the complex formation constants with the different metals are reported. |
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| Keywords: | Cadmium Zinc Speciation River water Voltammetry |
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