Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems.

J.P. Pinheiro, R. Domingos, M. Minor, H.P. van Leeuwen

Research output: Contribution to journalArticleAcademicpeer-review

17 Citations (Scopus)

Abstract

A lability criterion is developed for dynamic metal binding by colloidal ligands with convective diffusion as the dominant mode of mass transport. Scanned stripping chronopotentiometric measurements of Pb(II) and Cd(II) binding by carboxylated latex core-shell particles were in good agreement with the predicted values. The dynamic features of metal ion binding by these particles illustrate that the conventional approach of assuming a smeared-out homogeneous ligand distribution overestimates the lability of a colloidal ligand system. Due to the nature of the spatial distribution of the binding sites, the change in lability of a metal species with changing ligand concentration depends on whether the ligand concentration is varied via manipulation of the pH (degree of protonation) or via the particle concentration. In the former case the local ligand density varies, whereas in the latter case it is constant. This feature provides a useful diagnostic tool for the presence of geometrically constrained binding sites
Original languageEnglish
Pages (from-to)57-64
JournalJournal of Electroanalytical Chemistry
Volume596
Issue number1
DOIs
Publication statusPublished - 2006

Keywords

  • deposition potential sscp
  • stripping chronopotentiometry
  • complexes

Fingerprint Dive into the research topics of 'Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems.'. Together they form a unique fingerprint.

  • Cite this