2009
DOI: 10.1002/elan.200904631
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Assessment of Ion‐Ionophore Complex Diffusion Coefficients in Solvent Polymeric Membranes

Abstract: 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 io… Show more

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Cited by 12 publications
(10 citation statements)
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“…If this applied current is higher than the steady-state diffusion current [13], a detectable potential change at a transition time s signals the localized depletion of the transported ion at the membrane surface. With ion-selective membranes, this technique had been chiefly employed in fundamental studies to estimate ion or ionophore diffusion coefficients, either in the solution or membrane phase [14,15]. More recently, attractive analytical applications have emerged since the square root of transition time follows a linear relationship with the bulk concentration of the ion of interest.…”
Section: Introductionmentioning
confidence: 99%
“…If this applied current is higher than the steady-state diffusion current [13], a detectable potential change at a transition time s signals the localized depletion of the transported ion at the membrane surface. With ion-selective membranes, this technique had been chiefly employed in fundamental studies to estimate ion or ionophore diffusion coefficients, either in the solution or membrane phase [14,15]. More recently, attractive analytical applications have emerged since the square root of transition time follows a linear relationship with the bulk concentration of the ion of interest.…”
Section: Introductionmentioning
confidence: 99%
“…Although ion-selective membranes are mainly used for zero-current equilibrium measurements, a variety of non-equilibrium techniques have been devised to probe membrane characteristics or adjust membrane responses. For example, from the transition time (the instance of the breakpoint or breakpoint time) that appears in chronoamperometric (CA) [14] and chronopotentiometric (CP) [57] transients, the concentration or the diffusion coefficient of the free ionophore inside the membrane has been determined.…”
Section: Introductionmentioning
confidence: 99%
“…A breakpoint emerges in the CA and CP transients at a transition time when the free ionophore concentration approaches zero at the membrane boundary. It has been shown [13, 57] that the transition time is proportional to the diffusion coefficient and the square of the free ionophore concentration so that it can be used to determine either of these parameters from Eq. 1.…”
Section: Introductionmentioning
confidence: 99%
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