Florida Drinking Water Operator "B" Practice Test

Which chemical disinfectant is often used for its buoyancy and stability in water?

1. Chlorine

2. Ozone

3. Bromine

4. Iodine

The correct answer is: Bromine

Bromine is often favored in certain water treatment applications due to its buoyancy and stability in water, making it an effective disinfectant, particularly in hot tubs and swimming pools. Its properties allow it to maintain efficacy over time and in varying water temperatures. This characteristic is particularly advantageous because it can remain effective longer than other disinfectants, providing consistent microbial control. In comparing bromine to the other disinfectants, chlorine is widely used but may not have the same level of stability in warm water conditions as bromine does; ozone, while a strong oxidant, has limited stability and must be generated at the point of use; iodine, though effective as a disinfectant, is not typically used on a large scale for water supply systems and has limitations regarding its taste and potential for staining. Thus, the specific buoyancy and stability of bromine in water distinctly position it as a preferred choice in certain contexts, making it the correct answer in this scenario.