Huber, Christian and Klimant, Ingo and Krause, Christian and Werner, Tobias and Wolfbeis, Otto S. (2001) Nitrate-selective optical sensor applying a lipophilic fluorescent potential-sensitive dye. ANALYTICA CHIMICA ACTA, 449 (1-2). pp. 81-93. ISSN 0003-2670
Full text not available from this repository. (Request a copy)Abstract
An optical sensor has been developed for continuous determination of nitrate that is based on a polymer-stabilized emulsion system consisting of a hydrogel with entrapped plasticizer droplets. The droplets contain a cationic potential-sensitive fluorescent dye (PSD) located near its surface. The cationic PSD also acts as an anion-exchange catalyst that extracts nitrate out of the aqueous solution to form a complex (PSD+/NO3-) that moves into the plasticizer droplet due to its lipophilicity. This process causes a decrease of micro-polarity near the dye, resulting in an increase in the fluorescence intensity of the PSD. In a second detection scheme, the fluorescence intensity information of the PSD is converted into a fluorescence phase shift by mixing into the membrane particles that contain an inert long-lifetime reference luminophore. The second sensing scheme is referred to as "dual lifetime referencing". Both schemes can be used for reversible sensing of nitrate in the 0.1-50 mM range, with response times in the order of 3 min. (C) 2001 Elsevier Science B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | METAL-LIGAND COMPLEXES; LUMINESCENCE; MEMBRANE; emulsion sensor; nitrate sensor; potential-sensitive dye; dual lifetime referencing; reference beads |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Antje J. Bäumner, formerly Prof. Wolfbeis) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Nov 2021 09:12 |
| Last Modified: | 23 Nov 2021 09:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/40874 |
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