A potassium ion selective electrode (ISE) is reported based on the epoxyacrylate polymer prepared from o-nitrophenyl octyl ether as the plasticizer and 2,2′-bis [3,4-(15-crown-5-)-2-nitrophenylcarbamoxymethyl]tetradecane (BME-44) as the ionophore. Several different electrodes were studied by photo-curing different membranes onto a silver wire (0.8mm i.d.), and the response characteristics were evaluated. The membranes prepared exhibited strong adhesion to the metal substrate and showed improved mechanical strength compared to poly(vinyl chloride)-based membranes. The sensor exhibited Nernstian response over a log-linear range of between 0.01 mM and 100mM, and was selective against the common interfering ions. Fast response reaching 90% of steady-state value in 5 s makes this sensor applicable for flow injection potentiometry measurements. The potassium ISE allows for accurate determinations of potassium in various water samples by flow injection potentiometry.

Item Type:	Refereed Article
Research Division:	Chemical Sciences
Research Group:	Analytical Chemistry
Research Field:	Instrumental Methods (excl. Immunological and Bioassay Methods)
Objective Division:	Expanding Knowledge
Objective Group:	Expanding Knowledge
Objective Field:	Expanding Knowledge in the Chemical Sciences
Author:	Alexander, PW (Professor Peter Alexander)
Author:	Dimitrakopoulos, T (Mr Telis Dimitrakopoulos)
ID Code:	12282
Year Published:	1997
Web of Science® Times Cited:	7
Deposited By:	Applied Science
Deposited On:	1997-08-01
Last Modified:	2011-08-15
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