UNSPECIFIED (2000) Local amperometric detection of K+ in aqueous solution using scanning electrochemical microscopy ion-transfer voltammetry. ELECTROCHEMISTRY COMMUNICATIONS, 2 (3). pp. 201-206. ISSN 1388-2481

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Abstract

A robust ultramicroelectrode (UME) probe is described for the amperometric determination of K+ ions in aqueous solution. The approach is based on ion-transfer voltammetry at the interface between two immiscible electrolyte solutions (ITIES), with a liquid \ liquid interface formed between a 1,2-dichloroethane solution, containing dibenzo-18-crown-6. in a glass capillary, which is placed in an aqueous K+ salt solution of interest (KCl in this study). The ITIES is externally polarised by applying a potential between silver electrodes in each phase. The UME probe has an inlaid disk geometry, making conventional ultramicroelectrode and scanning electrochemical microscopy (SECM) mass transport models applicable. Limiting current measurements of K+ in aqueous solution show a linear dependence on KCl concentration between 1 X 10(-4) and 2.5 X 10(-3) mol dm(-3). The K+ microprobe is shown to be particularly suitable for use in SECM, for both approach curve and imaging applications. (C) 2000 Elsevier Science S.A. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	ELECTROCHEMISTRY COMMUNICATIONS
Publisher:	ELSEVIER SCIENCE INC
ISSN:	1388-2481
Date:	March 2000
Volume:	2
Number:	3
Number of Pages:	6
Page Range:	pp. 201-206
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/13644

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