1,1-Dibromo-3-chloroacetone is a halogenated ozone-chlorine and ozone chloramine disinfection byproducts (DBPs) at elevated bromide levels when chlorine or chloramine is used as a secondary disinfectant[1].
[1] Susan D. Richardson, et al. Identification of New Drinking Water Disinfection Byproducts Formed in the Presence of Bromide. Environ. Sci. Technol. 1999, 33, 19, 3378-3383.