Combined chlorine residual is formed by chlorine reacting with which substance?

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Prepare for the ADEQ Water Treatment Grade 4 Test. Study with flashcards and multiple-choice questions, with each question offering hints and explanations. Ace your exam!

Multiple Choice

Combined chlorine residual is formed by chlorine reacting with which substance?

Explanation:
Combined chlorine residual is chloramines—the chlorine-bound nitrogen compounds that form when chlorine reacts with nitrogen-containing substances like ammonia in water. As chlorine is added and encounters ammonia, it converts it into monochloramine, dichloramine, and sometimes trichloramine, which persist as the combined residual. The other options describe free chlorine species, a disinfection process, or a testing method, none of which define the combined residual itself.

Combined chlorine residual is chloramines—the chlorine-bound nitrogen compounds that form when chlorine reacts with nitrogen-containing substances like ammonia in water. As chlorine is added and encounters ammonia, it converts it into monochloramine, dichloramine, and sometimes trichloramine, which persist as the combined residual. The other options describe free chlorine species, a disinfection process, or a testing method, none of which define the combined residual itself.

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