Which chemical completes the list of disinfection chemicals: chloramine, chlorine, chlorine dioxide, and ________?

Which chemical completes the list of disinfection chemicals: chloramine, chlorine, chlorine dioxide, and ________?

• A. Fluorine
• B. Oxygen
• C. Ozone
• D. Bromine

Answer: (C)

Disinfection chemicals in drinking water come from several different oxidant families. The list given includes chloramine (a combined chlorine disinfectant), chlorine (the traditional primary disinfectant), and chlorine dioxide (another oxidizing disinfectant). The missing chemical that completes this common set is ozone, a powerful oxidant produced on-site from oxygen. It disinfects rapidly and can also help with taste, odor, and color issues, though it doesn’t leave a long-lasting residual in the distribution system. The other options don’t fit as standard disinfectants in this context: fluorine isn’t used as a primary disinfectant in drinking water, oxygen isn’t employed for disinfection in the same way, and bromine isn’t a standard municipal disinfectant in the same way as ozone for most systems.

Disinfection chemicals in drinking water come from several different oxidant families. The list given includes chloramine (a combined chlorine disinfectant), chlorine (the traditional primary disinfectant), and chlorine dioxide (another oxidizing disinfectant). The missing chemical that completes this common set is ozone, a powerful oxidant produced on-site from oxygen. It disinfects rapidly and can also help with taste, odor, and color issues, though it doesn’t leave a long-lasting residual in the distribution system. The other options don’t fit as standard disinfectants in this context: fluorine isn’t used as a primary disinfectant in drinking water, oxygen isn’t employed for disinfection in the same way, and bromine isn’t a standard municipal disinfectant in the same way as ozone for most systems.