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Amperometric Ion-Selective Electrode for Alkali Metal Cations Based on a Room-Temperature Ionic Liquid Membrane

✍ Scribed by Jan Langmaier; Antonín Trojánek; Zdenĕk Samec

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
244 KB
Volume
21
Category
Article
ISSN
1040-0397

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✦ Synopsis

Abstract

Cyclic voltammetry is used to study the transfer of a series of cations and anions across a room‐temperature ionic liquid membrane composed of tridodecylmethylammonium cation and tetrakis[3,5‐bis(trifluoromethyl) phenyl]borate anion. It is shown that the addition of water‐soluble crown ether (e.g. 18‐crown‐6) to the aqueous phase makes it possible to distinguish the voltammetric responses of alkali and alkaline earth metal cations. The determination of low concentrations of K^+^ (0.05–0.3 mM) in the presence of an excess of Mg^2+^ (1 mM) in water is demonstrated as a model application of an amperometric ion‐selective electrode for K^+^.

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