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Chemical oxygen demand differs from biochemical oxygen demand in that it measures

  • A.oxygen consumed by fish in the sample
  • B.oxygen dissolved in the water at the time of sampling
  • C.oxygen released by algae during the day
  • D.oxygen needed to oxidise organic matter chemically

Answer: D

COD uses a strong chemical oxidant and takes hours rather than days, and it includes material that microorganisms cannot degrade. It is therefore usually higher than the BOD of the same sample and is used where a quick result matters.

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