Ionophores in polymeric membranes for selective ion recognition; impedance studies |
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Authors: | A Lisowska-Oleksiak |
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Affiliation: | Department of Chemical Technology, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-952 Gdańsk, Poland |
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Abstract: | Synthetic calix4]arene-crown ionophores for selective Na+ (ionophore L1) and Cs+-ions (ionophore L2) recognition find application in ion-selective membrane electrodes (ISE) for analytical purpose. Selectivity coefficients for the electrodes with compounds L1 and L2 are = −2.6 and = −2.4, respectively. Electrodes of two different construction: all-solid-state (ASS) (with conducting polymer layer on glassy carbon or platinum as ion-to-electron transducer) and conventional ion-selective electrode (ISE) (with liquid electrolyte and Ag/AgCl) are presented and their properties and lifetime are being compared. Resistance of PVC membrane with ionophores L1 and L2 were within the range 0.15-1.4 MΩ depending on the type of the outer electrolyte and its concentration. Conductivity of the membranes was in the range 0.7 × 10−8 to 6 × 10−8 Ω−1 cm−1. Warburg coefficients σ were within 0.16 × 104 to 12.7 × 104 Ω s−1/2, dielectric constant values ? were in a range 28-60 depending mainly on the type of plasticizer. |
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Keywords: | Ionophores Membranes All-solid-state electrodes Conducting polymer Impedance spectroscopy |
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