Journal
ANALYTICA CHIMICA ACTA
Volume 826, Issue -, Pages 12-20Publisher
ELSEVIER
DOI: 10.1016/j.aca.2014.04.009
Keywords
Protonated primary organic amines; Facilitated ion transfer; Cyclic square wave voltammetry; Liquid membranes
Categories
Funding
- Direccion General de Investigacion Cientifica y Tecnica [CTQ2012-36700, CTQ2011-27049]
- Ministerio de Ciencia e Innovacion
- Ferdowsi University of Mashhad
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The transfer of the protonated forms of heptylamine, octylamine, decylamine, procaine and procainamide facilitated by dibenzo-18-crown-6 from water to a solvent polymeric membrane has been investigated by using cyclic square wave voltammetry. The experimental voltammograms obtained are in good agreement with theoretical predictions. The values of the standard ion transfer potential, complexation constant and diffusion coefficient in water have been obtained from these experiments, and have been used to draw some conclusions about the lipophilicity of these species and the relative stability of the organic ammonium complexes with dibenzo-18-crown-6. The results have been compared with those provided by linear sweep voltammetry. Calibration graphs were obtained with both techniques. An interesting chronoamperometric method for the determination of the diffusion coefficient of the target ion in the membrane has been developed and applied to all these protonated amines. (C) 2014 Elsevier B.V. All rights reserved.
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