What is the preservation and storage time for BOD samples?

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Multiple Choice

What is the preservation and storage time for BOD samples?

Explanation:
BOD testing relies on microorganisms consuming oxygen, so preserving the sample means slowing those biological changes with cold storage and keeping the testing window tight. Keeping the sample at 6°C or lower slows microbial activity, and the test should be started within 6 hours of collection with the entire analysis completed within 48 hours. This keeps the sample representative of conditions at the time of collection; delays or higher temperatures allow changes that bias the result. Room temperature speeds up changes and yields inaccurate results, freezing can interfere with the measurement process and invalidate the test, and waiting 72 hours exceeds the recommended window.

BOD testing relies on microorganisms consuming oxygen, so preserving the sample means slowing those biological changes with cold storage and keeping the testing window tight. Keeping the sample at 6°C or lower slows microbial activity, and the test should be started within 6 hours of collection with the entire analysis completed within 48 hours. This keeps the sample representative of conditions at the time of collection; delays or higher temperatures allow changes that bias the result. Room temperature speeds up changes and yields inaccurate results, freezing can interfere with the measurement process and invalidate the test, and waiting 72 hours exceeds the recommended window.

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