Investigation of potential-sensitive fluorescent dyes for application in nitrate sensitive polymer membranes |
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| Authors: | Gerhard J Mohr Frank Lehmann Ralf Östereich Ivana Murkovic Otto S Wolfbeis |
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| Institution: | (1) Karl-Franzens University, Institute for Organic Chemistry, Heinrichstrasse 28, A-8010 Graz, Austria, AT;(2) Friedrich-Schiller University, Institute for Physical Chemistry, Lessingstrasse 10, D-07743 Jena, Germany, DE;(3) University of Regensburg, Institute for Analytical Chemistry, Chemo- and Biosensors, D-93040 Regensburg, Germany, DE |
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| Abstract: | The applicability of various potential-sensitive dyes (PSD) for optical sensing of anions is reported. Specifically, nitrate-responsive
polymer membranes have been developed which are composed of a plasticized polymer, an anion exchange catalyst, and a fluorescent
dye. On exposure to nitrate, the fluorescence intensity of such membranes increases, while the wavelengths of the excitation
and emission maxima remain virtually unchanged. The membranes typically are 2–4 μm thick and exhibit highest sensitivity to
nitrate in the 2 to 200 mgl–1 range. Signal changes on exposure to 100 mmol/l nitrate can be as high as +300%. The detection limit is 0.2 mgl–1. The cationic PSD octadecyl acridine organe was tested in combination with a tin-organic and an indium-organic anion carrier
rather than with tridodecylmethylammonium chloride, but both carriers were found to display no improved selectivity.
Received: 2 December 1995 / Revised: 28 March 1996 / Accepted: 5 April 1996 |
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