Question 1011 of 229 · California Water Distribution Operator Exam
The total chlorine residual equals which combination?
Exactly one answer is correct.
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Correct answer to question 1011
- D: Free chlorine plus combined chlorine
Explanation
Total chlorine is the sum of free chlorine (HOCl and OCl-) and combined chlorine (chloramines). Free chlorine is the stronger disinfectant.
More questions: Disinfection
- 1012Which test is most often used by operators in the field to measure chlorine residual?
- 1013A sudden drop of chlorine residual at a dead-end hydrant most likely points to what?
- 1014Before a newly disinfected main is placed in service, what must the bacteriological samples show?
- 1015Which standard covers the disinfection of new and repaired water mains?
- 1016A well is most likely to need disinfection in which situation?
- 1017Which of the following is a common source of contamination of a water storage reservoir?