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- Title
Metal Complexation with Different types of Soluble and Adsorbed Freshwater Ligands Followed by DPASV.
- Authors
Cidália Botelho; Rui Boaventura; Maria de Simões Gonçalves
- Abstract
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.
- Subjects
PORTUGAL; RIVERS; LIGANDS (Chemistry); ZINC
- Publication
Aquatic Geochemistry, 2007, Vol 13, Issue 2, p173
- ISSN
1380-6165
- Publication type
Article
- DOI
10.1007/s10498-007-9014-z