After collection and preservation, a BOD sample can be stored for up to:

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Multiple Choice

After collection and preservation, a BOD sample can be stored for up to:

Explanation:
Stability of a BOD sample after collection rests on preventing ongoing biological activity from changing the oxygen demand before testing. When the sample is preserved (usually with mercuric chloride) and kept cold (around 4°C), microbial processes are slowed enough that the sample’s BOD remains representative for up to 48 hours. This 48-hour window is the maximum time allowed before incubation to ensure the result reflects the sample as collected rather than changes that occur over time. Beyond 48 hours, changes in microbes or chemical reactions can alter the oxygen consumption, leading to an inaccurate BOD value. So, the preserved sample can be stored up to 48 hours.

Stability of a BOD sample after collection rests on preventing ongoing biological activity from changing the oxygen demand before testing. When the sample is preserved (usually with mercuric chloride) and kept cold (around 4°C), microbial processes are slowed enough that the sample’s BOD remains representative for up to 48 hours. This 48-hour window is the maximum time allowed before incubation to ensure the result reflects the sample as collected rather than changes that occur over time. Beyond 48 hours, changes in microbes or chemical reactions can alter the oxygen consumption, leading to an inaccurate BOD value. So, the preserved sample can be stored up to 48 hours.

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