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New method for determining the concentration of ionic impurities in solvent polymeric membranes

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Abstract

A new method is proposed for ascertaining the amount of ionic impurities in solvent polymeric membranes of ion-selective electrodes. The method is based on determining the selectivity coefficient for ions of different valences as a function of the concentration of a lipophilized tetraphenylborate salt added to the membrane phase. Thus, the concentration of anionic impurities in commercially available poly(vinyl chloride) and of cationic ones in Tecoflex® (a polyurethane) was obtained as 0.063 ± 0.016 and 0.044 ± 0.006 mmol/kg, respectively.

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Authors and Affiliations

  1. Department of Organic Chemistry, Swiss Federal Institute of Technology (ETH), Universitätstrasse 16, CH-8092, Zürich, Switzerland

    Mathias Nägele & Ernö Pretsch

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  1. Mathias Nägele
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  2. Ernö Pretsch
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Nägele, M., Pretsch, E. New method for determining the concentration of ionic impurities in solvent polymeric membranes. Mikrochim Acta 121, 269–279 (1995). https://doi.org/10.1007/BF01248256

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  • DOI: https://doi.org/10.1007/BF01248256

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