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We developed and evaluated a fluorescence-based optical DO sensor (OS-100, Global OpticalCommunication Ltd., Korea) for long-term monitoring of the dissolved oxygen concentration in waste water treatment.Fluorescent sensing membrane containing Ru(Dpp)32+ (tris(4,7diphenyl-1, 10-phenanthroline) ruthenium(II)) wasprepared with GA sol-gel matrix and coated on a quartz plate by sprayed method. Properties of sensor film exhibitdeviation about ±1% under wide range of DO concentration from 3 to 10. The developed optical DO sensor wasactually mounted in waste water from dyeing industry and successfully applied for on-line DO monitoring. Onlinemonitoring results showed the changes of DO concentrations in wastewater treatment processes with accuracy betterthan ±2% during the 6 months measurements period in vicious environmental conditions.

Development and Characterization of Optical Dissolved Oxygen Sensor based on the Fluorescence Detection