Abstract
An analysis is presented of the significance of stripping chronopotentiometric (SCP) stripping peak parameters (peak potential, Ep, and peak half-width, w1/2) for determination of metal ion speciation. This study focuses on depletive SCP (low stripping current, I¿ constant), and considers the change in Ep and w1/2 in the presence of complexing and/or adsorbing ligands at both a conventional mercury drop electrode (HMDE) and a micro mercury droplet. We show that at a microelectrode, or at sufficiently long deposition time at a HMDE, the changes in Ep and w1/2 can be related to metal speciation in the bulk solution. Unlike transient stripping voltammetric methods such as DP-SV, depletive SCP is applicable even in the presence of adsorption of ligand and induced metal ion adsorption.
Original language | English |
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Pages (from-to) | 11-25 |
Journal | Journal of Electroanalytical Chemistry |
Volume | 535 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2002 |
Keywords
- fulvic substances
- stability-constants
- mercury-electrode
- humic substances
- lead
- complexes
- copper
- adsorption
- acid
- interface