Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/3199
Título: Scanned stripping chronopotentiometry of metal complexes: lability diagnosis and stability computation
Autor: Pinheiro, J. P.
Van Leeuwen, H. P.
Palavras-chave: Lability
Stripping chronopotentiometry
Scanned potential
Kinetic currents
Trace metals
Dynamic speciation
Data: 2004
Editora: Elsevier
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.
Resumo: 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.
Peer review: yes
URI: http://hdl.handle.net/10400.1/3199
DOI: http://dx.doi.org/10.1016/j.jelechem.2004.03.016
ISSN: 1572-6657
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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