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

Pinheiro, J. P.; Van Leeuwen, H. P.

http://hdl.handle.net/10400.1/3199

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Authors

Pinheiro, J. P.

Van Leeuwen, H. P.

Abstract(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.

Keywords

Lability Stripping chronopotentiometry Scanned potential SSCP Kinetic currents Trace metals Dynamic speciation

URI

http://hdl.handle.net/10400.1/3199

Citation

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.