Scanned stripping chronopotentiometry of metal complexes: lability diagnosis and stability computation

J.P. Pinheiro, H.P. van Leeuwen

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52 Citations (Scopus)

Abstract

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, ¿Ed,1/2, is straightforwardly related to the complex stability, K, irrespective of the degree of lability; the limiting wave height, t*, 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 ¿Ed,1/2 will be the same as that derived from the relative t* values so long as the system is fully labile. Discrepancies between ¿Ed,1/2-derived and t*-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.
Original languageEnglish
Pages (from-to)69-75
JournalJournal of Electroanalytical Chemistry
Volume570
Issue number1
DOIs
Publication statusPublished - 2004

Keywords

  • deposition potential sscp
  • dissociation kinetics
  • fundamental features
  • speciation analysis
  • systems

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