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The analytical application of square-wave voltammetry

✍ Scribed by Edward J. Zachowski; Marek Wojciechowski; Janet Osteryoung

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
762 KB
Volume
183
Category
Article
ISSN
0003-2670

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✦ Synopsis

The effects of changing certain parameters of the applied potential waveform at a dropping mercury electrode (DME) in square-wave voltammetry (s.w.v.) were investigated and compared with theory. Optimum parameters of the waveform are determined for a reversible system, lead(I1) in 0.10 M perchloric acid. Current sensitivities for Pb(I1) at a static mercury drop electrode by both the integrating and instantaneous current-measurement schemes available in a laboratory computer-based system are compared to those obtained from a commercial instrument suitable for S.W.V. An irreversible system, Ni(I1) m 0.10 M HCl, was investigated at the static mercury drop electrode and optimum parameters determined as for Pb(I1).

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Square-wave voltammetric measurements of the Eu(III)-salicylate (Eu-Sal) complex in 0.55 mol 1-l NaCl at pH 5.3 were made. At various europium concentration levels (from 10-s to 10e6 mol 1-r) the redox process of the Eu-Sal complex is reversible, with adsorption of the reactant of the redox reaction