In recent times, due to the limited availability of water resources and rapid industrialization, it is mandatory to preserve water quality. Ammonia is one of the most common pollutant observed in industrial and agricultural effluents. It is used as a bleaching agent in chemical industries and also in production of fertilizers, plastics and explosives. In effluents ammonia exists in equilibrium with ammonium ions. The concentration of ammonia gas increases with increase in pH and temperature. At neutral pH most of the ammonia exists as dissolved ammonium ions, but as the pH increases to 12, both ammonium ions and gaseous ammonia coexist in the effluent. The estimation of Ammonia in effluents is generally carried out by Nessler’s method and is determined as Ammonical Nitrogen (NH3-N) in ppm.
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