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Solid‐state sodium‐selective sensors based on screen‐printed Ag/AgCl reference electrodes
Author(s) -
Walsh S.,
Diamond Dermot,
McLaughlin J.,
McAdams E.,
Woolfson D.,
Jones D.,
Bonner M.
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.1140091704
Subject(s) - potentiometric titration , electrode , materials science , reference electrode , membrane , sodium , planar , working electrode , layer (electronics) , electrical impedance , analytical chemistry (journal) , optoelectronics , chemical engineering , inorganic chemistry , electrochemistry , chemistry , nanotechnology , chromatography , electrical engineering , biochemistry , computer graphics (images) , computer science , metallurgy , engineering
The potentiometric and AC impedance characteristics of all solid‐state sodium‐selective electrodes based on planar screen‐printed Ag/AgCl electrodes are described. Two solid‐state designs have been investigated. The first was based on the deposition of a sodium‐selective PVC membrane directly on top of a screen‐printed Ag/AgCl electrode. The second design included a NaCl doped hydrogel layer, between the PVC and Ag/AgCl layers. The hydrogel provides a mechanism to relieve any blockage to charge transfer occurring when PVC membranes are used directly on top of Ag/AgCl and also improves adhesion between the two layers. Results suggest the electrodes display fast ion exchange kinetics, low noise and drift. The performance compares favorably to that of a conventional ion‐selective electrode with internal filling solution.