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Discussion

Biochemical oxygen demand measures the oxygen consumed by

  • A.micro-organisms oxidising the organic matter
  • B.a strong chemical oxidant added to the sample
  • C.the dissolved metals in the sample
  • D.the evaporation of the sample to dryness

Answer: A

The standard determination incubates the sample for five days at 20 degrees and measures the dissolved oxygen lost. It reflects only the biodegradable fraction, which is why it is always lower than the chemical demand.

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