Fiber-optic-based measurement of ammonia for water monitoring applications

Ashutosh Sharma; Sohail Hamid Sheikh

doi:10.1117/12.260998

10 December 1996 Fiber-optic-based measurement of ammonia for water monitoring applications

Ashutosh Sharma, Sohail Hamid Sheikh

Proceedings Volume 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII; (1996) https://doi.org/10.1117/12.260998
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

A procedure has been developed for the measurement of ammonia in water. The paper describes the effect of the ammonia concentration on the emission of a fluorescent dye. From a plot of change in fluorescence against ammonia concentration, a linear response is achieved up to 250 ppb, with a detection limit of 8 ppb. When subjected to a solution of 50 ppb NH₃, the device showed 90% recovery of the original signal, within approximately 6 sec. The immobilized form of the fluorophore ensures an interaction with only molecular ammonia (NH₃) rather than ammonium ions. Hence the fiber-optic device based on the method reported here is insensitive to pH effects.

Citation Download Citation

Ashutosh Sharma and Sohail Hamid Sheikh "Fiber-optic-based measurement of ammonia for water monitoring applications", Proc. SPIE 2836, Chemical, Biochemical, and Environmental Fiber Sensors VIII, (10 December 1996); https://doi.org/10.1117/12.260998

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