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The mathematical modelling of ionic diffusion through stagnant layers: A modification of the Morf and Simon equation
Author(s) -
Lucas Sam,
Desai Mohamed,
Vadgama Pankaj
Publication year - 1992
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.1140040702
Subject(s) - electrode , diffusion , diffusion layer , ionic bonding , membrane , aqueous solution , glass electrode , ion , chemistry , analytical chemistry (journal) , ionic strength , chemical engineering , materials science , chromatography , thermodynamics , reference electrode , electrochemistry , biochemistry , physics , organic chemistry , engineering
An improved mathematical model of dynamic responses of a glass pH electrode and its correlation with that of a membrane‐mounted glass pH electrode on the basis of HCl diffusion through the stagnant layer is reported here. The application of such a model and its validity to aqueous and gel films, such as porcine gastric mucus, is evaluated across the pH spectrum. Dynamic responses of the membrane‐mounted glass pH electrode, modelled on this basis gave an excellent fit to the experimental data across the pH range for both films. The modified model described here takes into account the presence of any effect at the membrane/mucus interface for the experimental set‐up. The technique and model thus enables determination of ion flux in mucus or any coated ion selective electrode.