Krause, Christian and Werner, Tobias and Wolfbeis, Otto S. (1998) Multilayer potassium sensor based on solid-state coextraction. ANALYTICAL SCIENCES, 14 (1). pp. 163-167. ISSN 0910-6340
Full text not available from this repository.Abstract
A highly selective solid state multilayer sensor is presented which enables fluorescence optical determination of potassium ions. It is based on co-extraction using valinomycin along with a fluorescent anion, both contained in different layers. The sensor membrane is composed of two layers of highly different lipophilicity. The lipophilic phase contains the carrier valinomycin whilst the hydrophilic phase contains the anionic fluorophore sulforhodamin B. On exposure to potassium ions, the lipophilic phase becomes fluorescent after coextraction of both potassium ions and the anionic fluorophore. To prevent leaching of th-dye, an additional blocking layer (nafion) was spread on the sensor. The dynamic range is from 0.1 to 50 mmol/l K+ with very low cross-sensitivity to pH and ionic strength. The response times vary from 1 to 2 h.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COLORIMETRIC DETERMINATION; ELECTRON-TRANSFER; CROWN COMPOUNDS; ENERGY-TRANSFER; METAL-IONS; PLASMA; ALKALI; SERUM; CHROMOIONOPHORE; SELECTIVITY; potassium; optical solid state sensor; valinomycin; coextraction |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Feb 2023 09:20 |
| Last Modified: | 28 Feb 2023 09:20 |
| URI: | https://pred.uni-regensburg.de/id/eprint/50090 |
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