Voltammetry of biologically active species and surfactants on new miniaturized and contractible (compressible) mercury electrodes |
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Authors: | Ladislav Novotny |
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Institution: | (1) J.Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-182 23 Prague 8, Czech Republic, XX |
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Abstract: | The adsorption of the polyether-antibiotic monensin from an aqueous solution on mercury was used to investigate the effect
of the decreasing size of a stationary mercury drop electrode on the shape of the voltammetric desorption peak of the surfactant.
The change of the i-E curve indicated an acceleration of the transport of the surfactant to the electrode as well as of time-dependent
changes in the adsorption layer. A decrease of the radius of the hanging mercury drop electrode from 220 μm to 80 μm at a
constant accumulation time of tac = 70 s resulted in an about 4-fold increase of the evaluated signal (i-E pre-wave) of monensin. A 7-fold increase of the
voltammetric desorption peak of monensin at conc. 5 · 10–7 mol/L was observed as result of a compressive accumulation of the surfactant due to a contraction of the mercury drop electrode.
A scheme of an apparatus for voltammetric/polarographic measurements by means of the contractible (compressible) mercury drop
electrode is described. The controlled contraction of the electrode surface is presented together with preliminary results
covering a new way of accumulation of surfactants, new accumulation effects, effective in adsorptive voltammetry, and other
electroanalytical techniques.
Received: 26 March 1998 / Revised: 14 July 1998 / Accepted: 15 July 1998 |
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