Discussion
A water sample's dissolved oxygen falls from 8.2 to 3.4 mg/L over five days at 20 degrees. Its biochemical oxygen demand is
Answer: A
Correct answer: 4.8 mg/L
The biochemical oxygen demand is simply the oxygen consumed during the incubation: \[ 8.2 - 3.4 = 4.8\ \mathrm{mg/L}. \] The five days at 20 °C are the standard conditions, chosen by convention rather than because the oxidation is complete - the test measures a defined fraction of the total demand, which is why the conditions must always be quoted with the result.
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