Question 4001 of 223 · California Water Treatment Operator Exam
Which container is required for a routine bacteriological (coliform) sample?
Exactly one answer is correct.
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Correct answer to question 4001
- B: A sterile bottle containing sodium thiosulfate
Explanation
Sodium thiosulfate neutralizes chlorine at collection so the sample reflects bacteria present at the tap. The bottle must be sterile, and the cap and inside must not be touched.
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