construction a novel optode for quantitative measurement of ag+ cation in solutions based on covalent immobilization of thiazole yellow on triacetyl cellulose films

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 a linker, called epichlorohydrin. the interaction between the ag+ cation and immobilized thiazol yellow molecules was investigated using uv-vis spectrophotometry. the fabricated optode indicated a range from 3×10 -7 to 2.5×10-5  m  regarding to the concentration of ag+  cation at ph 6 and the detection limit was searched to be: 0.8×10-7 m. the constructed optical chemical sensor, shows a long-term stability, good reproducibility and repeatability,and also satisfied selectivity and sensitivity. the sensor response to ag+ cation is absolutely invertible and it can be reproduced simply with a solution of edta (ethylenediamine tetra acetic acid) in about 5 minutes. the response time is 10 minutes. the fabricated optode can be employed successfully to determine the concentration of ag+ cation in actual sample solutions.