Naslov
Investigation of potential sensitive fluorescent dyes for application in nitrate sensitive polymer membranes

Autori
Mohr, G.J. ; Lehmann, F. ; Ostereich, R. ; Murković, Ivana ; Wolfbeis, O.S.

Izvornik
Fresenius Journal of Analytical Chemistry (0937-0633) 357 (1997), 3; 284-291

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
poly(vinyl chloride) membrane; ion-selective optrode; optical sensors; photoluminescent properties; octadecylrhodamine-b; acridine orange; potassium; mechanism; water

Sažetak
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 mu m 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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA