Which disinfection by-product is known to be brominated?

Bromodichloromethane is a disinfection by-product that is specifically known to contain bromine in its chemical structure. This compound is formed when bromine, which is often encountered in water sources, reacts with chlorine during the disinfection process. The presence of bromine can lead to the formation of various brominated disinfection by-products, which are of concern due to their potential health effects.

In contrast, chloroform is a trihalomethane that does not contain bromine, making it a chlorine-only by-product. Haloacetic acid includes various species, some of which may not contain bromine at all, hence are not classified as brominated compounds. Similarly, monochloroacetic acid is a chlorinated compound and does not involve bromination either.

Understanding the specifics of brominated versus chlorinated disinfection by-products provides crucial insights into water quality, regulations, and health impacts related to water treatment practices.