Transmembrane ion fluxes for lowering detection limit of ion-selective electrodes

A3 Book section, Chapters in research books


Internal Authors/Editors


Publication Details

List of Authors: Tomasz Sokalski
Editors: Andrzej Lewenstam, Lo Gorton
Place: Hoboken
Publication year: 2015
Publisher: John Wiley & Sons
Book title: Electrochemical processes in biological systems
Title of series: Wiley series on electrocatalysis and electrochemistry
Start page: 23
End page: 59
ISBN: 978-0-470-57845-2
eISBN: 978-1-118-89884-0


Abstract

This chapter is devoted to the description of the detection limit (DL) of ion-selective electrodes (ISEs) with special attention to the role of transmembrane fluxes. The DL of ISEs has been radically improved, that is, lowered. This has led to the prospect of significantly expanding the use of ISEs in such important fields as clinical or environmental analysis. The lower DL of ion-selective polymeric membrane electrodes are in the micromolar range, except when ion buffers are used to keep the activities of the ions in the sample at low and constant levels through complexation or solubility equilibria. The Nernst–Planck–Poisson (NPP) model is an attempt at creating a general model. It considers both diffusion and migration; an unlimited number of ions, each with its own specific charge and its own specific diffusion coefficients in different phases; as well as the different dielectric permittivities of the different phases.

Last updated on 2020-25-02 at 05:54