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Scanned stripping chronopotentiometry of metal complexes: lability diagnosis and stability computation
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Orientador(es)
Resumo(s)
A method is presented for analyzing the dynamic speciation features of metal complexes based on stripping chronopotentiometry at a scanned deposition potential (SSCP). The shift in the SSCP half-wave deposition potential, DEd;1=2, is straightforwardly related to the complex stability, K, irrespective of the degree of lability; the limiting wave height, s , quantifies the metal species accumulated
in the electrode and thus depends on both the lability and mass transport properties of the metal complex species in solution. For
complexes with a lower diffusion coefficient than the free metal ion, K calculated from DEd;1=2 will be the same as that derived from
the relative s values so long as the system is fully labile. Discrepancies between DEd;1=2-derived and s -derived K values indicate loss of lability. We show that this approach is a sensitive indicator of lability, as illustrated by analysis of cadmium and lead binding by carboxylated nanospheres.
Descrição
Palavras-chave
Lability Stripping chronopotentiometry Scanned potential SSCP Kinetic currents Trace metals Dynamic speciation
Contexto Educativo
Citação
Pinheiro, J. P.; Van Leeuwen, H. P. Scanned stripping chronopotentiometry of metal complexes: Lability diagnosis and stability computation, Journal of Electroanalytical Chemistry, 570, 1, 69-75, 2004.
Editora
Elsevier