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Evaluation of a new solid‐state reference electrode junction material for ion‐selective electrodes
Author(s) -
Diamond Dermot,
McEnroe Eamonn,
McCarrick Mary,
Lewenstam Andrzej
Publication year - 1994
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.1140061108
Subject(s) - electrode , materials science , reference electrode , ultrapure water , electrochemistry , electrical impedance , analytical chemistry (journal) , chemistry , nanotechnology , chromatography , electrical engineering , engineering
The performance and properties of a new low‐resistance material, Refex, suitable for use in reference electrode junctions is described. The material is a solid polyvinyl acetate that contains a very‐ large loading of KCl (1:1 w/w KCI/PVA). Despite relatively large active surface areas in the designs studied (stand‐alone reference and combination pH), leakage rates of KCl are remarkably low. pH measurements in ultrapure water and comparative measurements in common buffer solutions against standard reference electrodes confirm the stability of the potential developed across the junction to be very stable. Impedance studies verify the importance of the KCl doping for realization of the low resistance and attractive electrochemical properties of the material.