Question 4005 of 223 · California Water Treatment Operator Exam
Free chlorine in a water sample is most often measured in the field with
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Correct answer to question 4005
- D: a colorimeter using the DPD method
Explanation
The DPD reagent reacts with free chlorine to make a pink color whose intensity is read on a colorimeter. Total chlorine uses additional reagent (potassium iodide).
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