Pulsed chronopotentiometric membrane electrodes based on plasticized poly(vinyl chloride) with covalently bound ferrocene functionalities as solid contact transducer

M Pawlak; E Grygolowicz-Pawlak; Eric Bakker

doi:10.1351/pac-con-11-09-23

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Pulsed chronopotentiometric membrane electrodes based on plasticized poly(vinyl chloride) with covalently bound ferrocene functionalities as solid contact transducer

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Pulsed chronopotentiometric membrane electrodes based on plasticized poly(vinyl chloride) with covalently bound ferrocene functionalities as solid contact transducer

M Pawlak, E Grygolowicz-Pawlak and Eric Bakker

Pure and Applied Chemistry, Vol.84(10), pp.2045-2054

2012

DOI: https://doi.org/10.1351/pac-con-11-09-23

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Abstract

analytical chemistry

click chemistry

electrochemistry

ion-selective

electrodes

liquid-liquid interfaces

membranes

solid-state electrodes

ion-selective electrodes

sensors

Ion-selective membrane materials based on poly(vinyl chloride) (PVC)-containing covalently attached redox-active ferrocene (Fc) groups are characterized here as all-solid-state pulsed voltammetric ion sensors. The redox capacity of the membrane increases 7-fold with a doubling of the Fc content and 3-fold with the addition of 10 wt % of the lipophilic electrolyte ETH 500, tetradodecylammonium tetrakis(4-chlorophenyl) borate. This salt improves the ionic conductivity of the membrane and appears to make the Fc groups electrochemically more accessible. A too high content of the two, on the other hand, was found to cause undesired sensitivity to redox-active species present in the sample solution. Dilution of the membrane with a plasticizer eliminated this redox sensitivity while preserving its high redox capacity. A practical application of the designed electrodes in electrochemical analysis was demonstrated with a multi-pulse protocol that includes a current-controlled ion uptake pulse, followed by an open-circuit potential (OCP) measurement and a regeneration pulse. Potentiometric calibration curves obtained with this protocol exhibited a linear response with near-Nernstian slopes for acetate, nitrate, chloride, and perchlorate ions with the selectivity expected for an ion-exchanging membrane.

Details

Title: Pulsed chronopotentiometric membrane electrodes based on plasticized poly(vinyl chloride) with covalently bound ferrocene functionalities as solid contact transducer
Authors: M Pawlak (Author) - University of Geneva, Switzerland
E Grygolowicz-Pawlak (Author) - University of Geneva, Switzerland
Eric Bakker (Author) - University of Geneva, Switzerland
Publication details: Pure and Applied Chemistry, Vol.84(10), pp.2045-2054
Publisher: Walter de Gruyter GmbH & Co. KG
Date published: 2012
DOI: 10.1351/pac-con-11-09-23
ISSN: 0033-4545
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450393402621
Output Type: Journal article

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