Impedance-based sensor for potassium ions.

Autor: Day C; Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom. Electronic address: jcd62@cam.ac.uk., Søpstad S; Institute for Microsystems, University College of Southeast Norway, N-3184, Borre, Norway; Zimmer & Peacock AS, N-3183, Horten, Norway. Electronic address: sindre@zimmerpeacock.com., Ma H; Electrical Engineering Division, Engineering Department, University of Cambridge, 9 JJ Thomson Avenue, Cambridge, CB3 0FA, United Kingdom. Electronic address: hm446@cam.ac.uk., Jiang C; Electrical Engineering Division, Engineering Department, University of Cambridge, 9 JJ Thomson Avenue, Cambridge, CB3 0FA, United Kingdom. Electronic address: cj360@cam.ac.uk., Nathan A; Electrical Engineering Division, Engineering Department, University of Cambridge, 9 JJ Thomson Avenue, Cambridge, CB3 0FA, United Kingdom. Electronic address: an299@eng.cam.ac.uk., Elliott SR; Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom. Electronic address: sre1@cam.ac.uk., Karet Frankl FE; Cambridge Institute for Medical Research, Cambridge Biomedical Campus, Cambridge, CB2 0XY, United Kingdom. Electronic address: fek1000@cam.ac.uk., Hutter T; Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom. Electronic address: tf269@cam.ac.uk.
Jazyk: angličtina
Zdroj: Analytica chimica acta [Anal Chim Acta] 2018 Nov 30; Vol. 1034, pp. 39-45. Date of Electronic Publication: 2018 Jun 20.
DOI: 10.1016/j.aca.2018.06.044
Abstrakt: 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.
(Copyright © 2018 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE