Question 2015 of 234 · California Wastewater Operator Exam
A sample bottle for bacteriological analysis of chlorinated effluent should contain
Exactly one answer is correct.
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Correct answer to question 2015
- B: sodium thiosulfate to neutralize chlorine
Explanation
Thiosulfate removes residual chlorine at the moment of collection so the sample reflects the actual bacteria count rather than continuing disinfection in the bottle.
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