Assessment of Ion-Ionophore Complex Diffusion Coefficients in Solvent Polymeric Membranes

Autor: Sándor Bodor, Róbert E. Gyurcsányi, Justin M. Zook, Ernő Lindner, Klára Tóth
Rok vydání: 2009
Předmět:
Zdroj: Electroanalysis. 21:1923-1930
ISSN: 1521-4109
1040-0397
DOI: 10.1002/elan.200904631
Popis: Chronoamperometric (CA) and chronopotentiometric (CP) transients have been used previously for the determination of the diffusion coefficients of free ionophores in ion-selective liquid membranes. In this work, the CA and CP transients are utilized to determine the diffusion coefficients of a variety of ion-ionophore complexes in these membranes. The conditions under which the ion-ionophore complex diffusion coefficients can be determined from the CA and CP transients are discussed. For most ionophores, the ion-ionophore complex diffusion coefficients were found to be slightly smaller or similar to the previously calculated free ionophore diffusion coefficients. However, for a couple of ionophores, the ion-ionophore complex diffusion coefficients were found to be significantly smaller than expected. Significant ion-pair formation in the membranes can explain this disparity.
Databáze: OpenAIRE
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