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Influence of the medium on the polarographic behavior of Cu(II)

✍ Scribed by M. Lurdes S.; Sim˜Es Gonçalves; Laura Sigg

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
448 KB
Volume
3
Category
Article
ISSN
1040-0397

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✦ Synopsis

The critical evaluation of the determination of copper by pulse and stripping voltammetric methods in the presence of ligands occurring in natural waters was performed. The conditions under which Cu(1) can be detected, either due to its presence in solution or as an electrochemical intermediate, were investigated. The ligands C1-and NH, were considered and their effects in analytical determinations of Cu in natural waters are discussed. Concentrations of C1-> 1.6 X lop2 M and NH, > lop3 M lead to the reduction of Cu(I1) in two steps with Cu(1) intermediates. We illustrate that the stability constants of complexes of Cu(1) can be determined by starting with the more stable solutions of copper(I1) and electrochemically (in situ) producing Cu(1).

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