Mohr, Gerhard J. and Lehmann, Frank and Östereich, Ralf and Murkovic, Ivana and Wolfbeis, Otto S. (1997) Investigation of potential-sensitive fluorescent dyes for application in nitrate sensitive polymer membranes. Fresenius' Journal of Analytical Chemistry 357 (3), pp. 284-291.
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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/1 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.
|Institutions:||Chemistry and Pharmacy > Institut für Analytische Chemie, Chemo- und Biosensorik > Chemo- und Biosensorik (Prof. Otto S. Wolfbeis)|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||07 Jun 2011 11:21|
|Last Modified:||21 Jul 2011 02:14|