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The effect of hydrodynamic conditions on the speciation of copper at a chemically modified electrode

✍ Scribed by Ján Labuda; Mária Vaníačková

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
517 KB
Volume
6
Category
Article
ISSN
1040-0397

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✦ Synopsis

The determination of copper in the presence of humic acid and osalic acid using anodic srripping voltammetn- (ASV) at the graphite electrode modified with a copper complesing agent, l-phenyl-3methyl-+octanoylpyrazol-5-on. and a Nafion film is described. The validit). of voltammetric criteria for the metal speciation based on the diffusion-la!.er thickness and complexing conditions, has been esamined. In the copper-humic acid system, the signal is controlled by diffusion, whereas in the system with oxalic acid, both the dissociation kinetics and diffusion have to be considered.

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