Original scientific paper

»Programmable« Selective Inexpensive Potentiometric Detector for Flow Injection Analysis. Potassium Determination with a Nafion Membrane Modified Electrode

Naim Akmal ; Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172
Suzanne K. Lunsford ; Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172
Ahmed Galal ; Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172
A. Ersin Karagozler ; Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172
Harry B. Mark, Jr. ; Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172
Njegomir Radić ; Department of Chemistry, Faculty of Technology, University of Split, 58000 Split, Croatia

Abstract

The study of a nafion membrane (ISE membrane) for the inexpensive potentiometric detection of potassium ion in a flow injection system is reported. The nafion membrane doped with potassium ion showed that excellent selectivity could be achieved for various cations, except for Rb+, and some interference for Cs+. A linear potential response of 10-2 - 10~® M for the potassium ion was obtained with a detection limit of about 0.5 x 10-6 M. This approach can be employed for constructing a potentiometric detector for virtually any cation (soluble at basic pH values) by simply changing the electrode pretreatment (or doping solution).

Keywords

Hrčak ID:

136762

URI

https://hrcak.srce.hr/136762

Publication date:

1.5.1995.

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