Mirceski, Valentin and Gulaboski, Rubin and Scholz, Fritz (2002) Determination of the standard Gibbs energies of transfer of cations across the nitrobenzene|water interface utilizing the reduction of iodine in an immobilized nitrobenzene droplet. Electrochemistry Communications, 4 (10). pp. 814-819. ISSN 13882481
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Abstract
When a nitrobenzene (NB) droplet containing iodine is attached to a graphite electrode and immersed into a chloride containing
aqueous (AQ) solution, the electrochemical reduction of iodine is accompanied by a transfer of chloride ions from NB to water.
These chloride ions enter the NB phase in a preceding partition between the AQ and the NB phases, supported by formation of
I2Cl� ions in NB and accompanied by the transfer of stoichiometric amounts of cations. The overall electrode reaction is of CErev
type, where C refers to the preceding chemical step forming I2Cl�, and Erev refers to the reversible reduction of iodine at the
graphitejNB interface and the simultaneous transfer of chloride from NB to water. If the chloride concentration in NB is insufficient
to compensate by leaving the NB the amount of electrochemically produced iodide, a second voltammetric signal occurs at more
negative potentials due to the transfer of iodide from NB to water. The kinetics and thermodynamics of the preceding chemical step
C, determine the voltammetric behaviour of the system in such way that the ratio of peak currents of the first and second signals
depends linearly on the Gibbs energy of transfer of the co-partitioned cations. The method was validated for cations of known
Gibbs energies of transfer, and it was applied to cations of amino acids.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | iodine voltammetry, biomimetic membranes, liquid-liquid interface, ion transfer, amino acids |
| Subjects: | Natural sciences > Chemical sciences |
| Divisions: | Faculty of Agriculture |
| Depositing User: | Rubin Gulaboski |
| Date Deposited: | 31 Oct 2012 13:11 |
| Last Modified: | 05 Nov 2012 11:09 |
| URI: | https://eprints.ugd.edu.mk/id/eprint/146 |
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