Impedance-based sensor for potassium ions.
Karet Frankl, FE
Anal Chim Acta
MetadataShow full item record
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
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.
Ions, Potassium, Electric Impedance, Electrochemical Techniques
Henslow Fellowship, Darwin College, Cambridge L'Oreal -UNESCO UK & Ireland Fellowship For Women In Science
Kidney Research UK (RP_053_20160307)
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
Attribution-NonCommercial-NoDerivatives 4.0 International
Licence URL: http://creativecommons.org/licenses/by-nc-nd/4.0/