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Potentiometric response behavior of parallel arrays of cation‐ and anion‐selective membrane electrodes as reference devices
Author(s) -
Morf Werner E.,
de Rooij Nicolaas F.
Publication year - 1997
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140091207
Subject(s) - potentiometric titration , electrode , ohmic contact , reference electrode , membrane , ion , potential difference , streaming current , standard electrode potential , electric potential , diffusion , membrane potential , chemistry , materials science , analytical chemistry (journal) , optoelectronics , voltage , electrochemistry , chromatography , thermodynamics , electrical engineering , physics , biochemistry , organic chemistry , engineering
The potential response of reference devices consisting of parallel arrays of cation‐ and anion‐selective membrane electrodes is studied on a theoretical basis. A general treatment of the overall electric potential difference is offered that accounts for contributions by diffusion potentials, boundary potentials, ohmic potential drops, and streaming potentials. Explicit solutions are given for special cases. The treatment makes it possible to recognize the capabilities and the limitations of membrane‐based reference devices, and to compare their performance with the behavior of conventional reference electrodes using liquid‐junction contacts. The applicability of membrane‐based reference systems is found to be restricted to relatively specific samples.