A New Fiber-Optic-Based Ion Sensor.
INDIANA UNIV AT BLOOMINGTON DEPT OF CHEMISTRY
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A fluorimetric fiber-optic-based ion sensor has been developed that employs rhodamine 6G hydrophobically and electrostatically trapped on a Nafion film. The sensor is based on the measurement of quenching or enhancement of rhodamine 6G fluorescence by various ions. It was found that ions like CoII, CrIII, FeII, FeIII, CuII, NiII and NH4 rapidly quench the rhodamine 6G fluorescence at an initial rate that depends on the ions concentration. This quenching is then readily reversed by the addition of reverser ions concentration. This quenching is then readily reversed by the addition of reverser ions like H, Li, Na, K, BaII, CaII, MnII, ZnII and MgII. Again, the initial rate for the attainment of the original fluorescence was found to depend on the reverser ions concentration. Therefore, by monitoring the quenching directly the concentration of quencher ions can be determined. In addition, by loading the film with quencher and monitoring the initial rate of return toward the original baseline signal one can quantitate non-quenching ions. Keywords Fiber optics Sensors Remote sensing Ion measurement.
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