Chloramination - In certain cases, the presence of combined available chlorine may be desirable over that of free available chlorine in spite of their low disinfective capacity. For instance, chlorination of water rich in organic matter may give undesirable odor.
But chloramines are less reactive towards organic matter. Thus in this chloramines are preferred over hypochlorous acid. In Chloramination, formation of monochloramine is favoured by the addition of chlorine along with ammonia to water.
