Reactivity of Bromine-Substituted Haloamines in Forming Haloacetic Acids

When drinking water is chloraminated in the presence of bromide, bromine-substituted haloacetic acids typically form. Monochloramine is the dominant haloamine species under drinking water treatment conditions. In the presence of bromide, bromine-substituted haloamines, such as mono- and dibromamine, as well as bromochloramine may also form. These bromine-substituted haloamines are typically present in much lower concentrations than monochloramine, but are significantly more reactive in forming haloacetic acids (HAAs). The reactivity of the bromine-substituted haloamine species was studied in two different surface water supplies. HAA formation from each of the bromine-substituted species (NH(2)Br, NHBr(2), and NHBrCl) was 4 to 12 times that from monochloramine (NH(2)Cl).