Journal
ANALYTICAL CHEMISTRY
Volume 90, Issue 15, Pages 9644-9649Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.8b02659
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Funding
- National Science Centre (NCN, Poland) [2014/15/B/ST5/02185]
- Business Finland [554/31/2016]
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The Nernst-Planck-Poisson model is used for modeling the sensitivity and selectivity of ion-selective electrodes (ISEs) with plastic membranes. Two pivotal parameters characterizing ISE response are in focus: sensitivity and selectivity. An interpretation of sensitivity, which considers the concurrent influence of anions and cations on the ISE slope, is presented. The interpretation of selectivity shows the validity and limits of approaches hitherto taken to measure the true (unbiased) selectivity coefficient. The validity of more idealized interpretations by the diffusion-layer model is conceived.
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