Flow-injection potentiometric detection of phosphate has been undertaken using a metallic cobalt wire ion-selective electrode. The electrode response to phosphate was characterised by potential readings of high stability versus a Ag/AgCl reference electrode, and results have shown that the electrode displays high sensitivity and selectivity towards the phosphate ion. The metallic cobalt wire electrode was used for the flow-injection potentiometric detection of phosphate using a 0.04 mol l-1 potassium hydrogen phthalate carrier at pH 5.0. A linear response with a slope of -38.00 ± 0.5 mV decade-1 change in phosphate activity was obtained in the range 1.0 × 10-5-5.0 × 10-3 mol l-1, and the detection limit was 1 × 10-6 mol l-1. The phosphate electrode described in this paper is robust, simple to use, highly selective, inexpensive and highly stable.

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)
ID Code:	12353
Year Published:	1997
Web of Science® Times Cited:	47
Deposited By:	Applied Science
Deposited On:	1997-08-01
Last Modified:	2011-08-15
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