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Chemical Oxygen Demand of Waste water





  • What are the importance and applications of COD in our day to day life? Explain why COD can be used as a measure of water pollution by organic compounds?
  • Why do BOD and COD values for the same water sample are always different? Give two reasons?
  • Calculate COD of a sample of water if 30 mL of the sample consumed 2.8 mL of 0.2 N potassium dichromate solution?
  • The permanganate method was the oldest method commonly used in the water industry for COD determination. Nowadays, the dichromate procedure is most widely used instead of permanganate method. Explaining why it is so?



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