Abstract
The performance of solid-contact coated-wire-type electrodes with plasticized poly(vinyl chloride) membranes containing metalloporphyrins as anion-selective ionophores is reported. The membranes are deposited on transducers based on graphite pastes and graphite rods. The hydrophobicity of the underlying conductive transducer surface is found to be a key factor that influences the formation of an aqueous layer beneath the polymer film. Elimination of this ill-defined water layer greatly improves the electrochemical properties of the ion-sensors, such as electromotive force stability and lifetime. Only highly lipophilic electrode substrates, namely graphite paste with mineral oil, were shown to prevent the formation of aqueous layer underneath the ion-sensing membrane. The possibility of employing Co(III)-tetraphenylporphyrin both as NO2 − selective ionophore and as electron- and ion-conducting species to ensure ion-to-electron translation was also discussed based on the results of preliminary experiments.
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Acknowledgement
This scientific work was financially supported from research fund (2007–2009) as a research project (grant # N N204 0294 33). We also thank Warsaw University of Technology and the National Institutes of Health for partial support of this work (grant # EB-000784).
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Górski, Ł., Matusevich, A., Pietrzak, M. et al. Influence of inner transducer properties on EMF response and stability of solid-contact anion-selective membrane electrodes based on metalloporphyrin ionophores. J Solid State Electrochem 13, 157–164 (2009). https://doi.org/10.1007/s10008-008-0613-4
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DOI: https://doi.org/10.1007/s10008-008-0613-4