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 321331
Title Stripping chronopotentiometry at scanned deposition potential (SSCP). Part 2. Determination of metal ion speciation parameters
Author(s) Leeuwen, H.P. van; Town, R.M.
Source Journal of Electroanalytical Chemistry 541 (2003). - ISSN 1572-6657 - p. 51 - 65.
Department(s) Physical Chemistry and Colloid Science
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) voltammetric measurements - stability-constants - estuarine waters - natural-waters - complexation - electrode - copper - lead - lability - systems
Abstract Stripping chronopotentiometry at scanned deposition potential (SSCP) generates curves that are fundamentally different in form from classical polarographic waves. Still, despite their steeper slope and non-linear log plot, the shift in the SSCP half-wave deposition potential can be interpreted in a manner completely analogous to the DeFord-Hume treatment of polarographic waves. SSCP provides a reliable measure of metal speciation in the sample solution in the presence of simple ligands (i.e. those with non-distributed K and D values), even when there is relatively small ligand excess, and it is unaffected by induced metal adsorption. Data interpretation is not so straightforward for heterogeneous ligands: the presence of a range of metal complexes of slightly different stability and mobility flattens the SSCP wave as compared to the homogeneous case. The time dependent nature of the surface concentration of metal ion during deposition precludes straightforward rigorous interpretation of heterogeneous metal ion speciation. (C) 2002 Elsevier Science B.V. All rights reserved.
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