Electrochemical evidences and consequences of significant differences in ions diffusion rate in polyacrylate-based ion-selective membranes

The origin and effect of surface accumulation of primary ions within the ion-selective poly(n-butyl acrylate)-based membrane, obtained by thermal polymerization, is discussed. Using a new method, based on the relation between the shape of a potentiometric plot and preconditioning time, the diffusion...

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Bibliographic Details
Published in:Analyst (London) 2011-11, Vol.136 (22), p.4787-4793
Main Authors: WOZNICA, Emilia, MIECZKOWSKI, Józef, MICHALSKA, Agata
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
COPPER IONS
DIFFUSION
Diffusion coefficient
DIFFUSION COEFFICIENTS
Diffusion rate
Electrochemical methods
Exact sciences and technology
Exposure
Ion diffusion
MEMBRANES
MICA
Sodium
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Summary:The origin and effect of surface accumulation of primary ions within the ion-selective poly(n-butyl acrylate)-based membrane, obtained by thermal polymerization, is discussed. Using a new method, based on the relation between the shape of a potentiometric plot and preconditioning time, the diffusion of copper ions in the membrane was found to be slow (the diffusion coefficient estimated to be close to 10(-11) cm(2) s(-1)), especially when compared to ion-exchanger counter ions--sodium cations diffusion (a diffusion coefficient above 10(-9) cm(2) s(-1)). The higher mobility of sodium ions than those of the copper-ionophore complex results in exposed ion-exchanger role leading to undesirably exposed sensitivity to sodium or potassium ions.
ISSN:0003-2654
1364-5528
DOI:10.1039/c1an15131b