Question 2007 of 234 · California Wastewater Operator Exam
How should a BOD sample be preserved if it cannot be analyzed immediately?
Exactly one answer is correct.
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Correct answer to question 2007
- D: Cool it to 6 degrees Celsius or below and analyze it within 48 hours
Explanation
Cooling slows biological activity that would change the BOD. Chlorine would kill the organisms needed for the test, so it is not used as a preservative.
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