Croatica Chemica Acta, Vol. 76 No. 3, 2003.
Original scientific paper
Application of a Novel Lipophilized Derivative of Rhodamine 19 in an Optical Sensor Suitable for Measurements of pH in Alkaline Regions
Snežana Miljanić
; Laboratory of Analytical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Strossmayerov trg 14, 10000 Zagreb, Croatia
Zvjezdana Cimerman
; Laboratory of Analytical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Strossmayerov trg 14, 10000 Zagreb, Croatia
Abstract
An optical pH sensor based on the fluorescence of a new lipophilic rhodamine dye immobilized in a thin poly(vinyl chloride) membrane was developed. The response to hydrogen ions was a result of reversible changes in the molecular structure of rhodamine. Excited at 528 nm, the membrane fluoresced at 547 nm. The sensor system showed a usable sensitivity over the 9.5-11.9 pH range and very good reproducibility.
Keywords
rhodamine 19 octadecylamide; fluorescence; optical sensor; pH determination
Hrčak ID:
103169
URI
Publication date:
29.8.2003.
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