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Capacitive Model for Coulometric Readout of Ion-Selective Electrodes

Han, Tingting
Mattinen, Ulriika
Bobacka, Johan
Published in Analytical chemistry. 2018, vol. 90, no. 14, p. 8700-8707
Abstract We present here a capacitive model for the coulometric signal transduction readout of solid-contact ionselective membrane electrodes (SC-ISE) with a conducting polymer (CP) as an intermediate layer for the detection of anions. The capacitive model correlates well with experimental data obtained for chloride-selective SC-ISEs utilizing poly(3,4-ethylenedioxythiophene) (PEDOT) doped with chloride as the ion-to-electron transducer. Additionally, Prussian blue is used as a simple sodium capacitor to further demonstrate the role of the transduction layer. The influence of different thicknesses of PEDOT as a conducting polymer transducer, different thicknesses of the overlaying ion-selective membranes deposited by drop casting and spin coating, and different compositions of the chloride-selective membrane are explored. The responses are evaluated in terms of current−time, charge−time, and charge−chloride activity relationships. The utility of the sensor with coulometric readout is illustrated by the monitoring of very small concentration changes in solution.
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Research group Groupe Bakker
(ISO format)
JAROLIMOVA, Zdenka et al. Capacitive Model for Coulometric Readout of Ion-Selective Electrodes. In: Analytical Chemistry, 2018, vol. 90, n° 14, p. 8700-8707. doi: 10.1021/acs.analchem.8b02145 https://archive-ouverte.unige.ch/unige:109295

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Deposited on : 2018-10-17

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