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

https://hrcak.srce.hr/103169

Publication date:

29.8.2003.

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