Impedance-based sensor for potassium ions.
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Authors
Day, C
Søpstad, S
Nathan, Arokia
Elliott, Stephen
Karet Frankl, FE
Publication Date
2018-11-30Journal Title
Anal Chim Acta
ISSN
0003-2670
Publisher
Elsevier BV
Volume
1034
Pages
39-45
Language
eng
Type
Article
Physical Medium
Print-Electronic
Metadata
Show full item recordCitation
Day, C., Søpstad, S., Ma, H., Jiang, C., Nathan, A., Elliott, S., Karet Frankl, F., & et al. (2018). Impedance-based sensor for potassium ions.. Anal Chim Acta, 1034 39-45. https://doi.org/10.1016/j.aca.2018.06.044
Abstract
A conductometric sensor for potassium ions in solution is presented. Interdigitated, planar gold electrodes were coated with a potassium-selective polymer membrane composed of a poly(vinyl chloride) matrix with about 65 wt% of plasticiser and 2-5 wt% of a potassium-selective ionophore. The impedance of the membrane was measured, using the electrodes as a transducer, and related to the concentration of potassium in a sample solution in contact with the membrane. Sensitivity was optimised by varying the sensor components, and selectivity for potassium over sodium was also shown. The resulting devices are compact, miniature, robust sensors which, by means of impedance measurements, eliminate the need for a reference electrode. The sensor was tested for potassium concentration changes of 2 mM across the clinically relevant range of 2.7-18.7 mM.
Keywords
Ions, Potassium, Electric Impedance, Electrochemical Techniques
Sponsorship
Henslow Fellowship, Darwin College, Cambridge
L'Oreal -UNESCO UK & Ireland Fellowship For Women In Science
Funder references
Kidney Research UK (RP_053_20160307)
Identifiers
External DOI: https://doi.org/10.1016/j.aca.2018.06.044
This record's URL: https://www.repository.cam.ac.uk/handle/1810/283532
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: http://creativecommons.org/licenses/by-nc-nd/4.0/
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