That portion of the total available residual chlorine composed of dissolved chlorine gas cl2), hypochlorous acid (HOCl), and/or hypochlorite ion (OCl-) remaining in water after chlorination. This does not include chlorine that has combined with ammonia, nitrogen, or other compounds.
FREE AVAILABLE RESIDUAL CHLORINE
Meaning of FREE AVAILABLE RESIDUAL CHLORINE in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012