Document Type : Original Paper


1 No.73- DEBEL9- Pirouzi - Mashhad - Iran

2 Ferdowsi University of Mashhad

3 Azad University of Mashhad


To measure the concentration of Ag+ cation in solutions, a new optical chemical sensor was fabricated by covalent immobilization of thiazole yellow dye on a triacetyl cellulose film via epichlorohydrin as a linker. The interaction between the Ag+ cation and immobilized thiazol yellow molecules was studied using UV-Vis spectrophotometry. The fabricated optode, indicated a range from 3×10 -7 to 2.5×10-5 M with respect to the concentration of Ag+ cation at pH 6, and its detection limit was found to be:0.8×10-7 M. The constructed optical chemical sensor, shows long-term stability, good reproducibility, and repeatability, and also satisfied selectivity and sensitivity. The response of the sensor to Ag+ cation is absolutely reversible and it can be reproduced easily with a solution of EDTA (ethylenediamine tetraacetic acid ) in about 5 minutes. Its response time is 10 minutes. The constructed optode can be used successfully for determining the concentration of Ag+ cation in real sample solutions