Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 366187
Title Metal speciation dynamics in colloidal ligand dispersions. Part 2: Electrochemical lability
Author(s) Pinheiro, J.P.; Minor, M.; Leeuwen, H.P. van
Source Journal of Electroanalytical Chemistry 587 (2006)2. - ISSN 1572-6657 - p. 284 - 292.
DOI https://doi.org/10.1016/j.jelechem.2005.11.022
Department(s) Physical Chemistry and Colloid Science
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) association dissociation kinetics - different diffusion-coefficients - stripping chronopotentiometry - limiting current - complex systems - steady-state - trace-metals - voltammetry - microelectrodes
Abstract We investigate the dynamic nature of metal speciation in colloidal dispersions using a recently proposed theory [J.P. Pinheiro, M. Minor, H.P. Van Leeuwen, Langmuir, 21 (2005) 8635] for complexing ligands that are situated on the surface of the particles. The new approach effectively modifies the finite rates of association/dissociation of the colloidal metal complexes, thus invoking consideration of the two basic dynamic criteria: the association/dissociation kinetics of the volume complexation reaction (the "dynamic" criterion), and the interfacial flux of free metal to a macroscopic surface due to dissociation of complex species (the "lability" criterion). We demonstrate that the conventional approach for homogeneous systems that assume a smeared-out ligand distribution, overestimates both the dynamics and the lability of metal complexes when applied to colloidal ligands. It is also shown that the increase of lability with increasing particle radius, as expected for a homogeneous solution, is moderated for spherical microelectrodes and practically eliminated for planar electrodes.
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