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What are DO, COD and BOD ?...

What are DO, COD and BOD ?

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COD : The amount of Oxygen required to oxidise organic substances present in polluted water is called a chemical oxygen demand. It is a parameter for measuring the water pollution. It is determined by oxidising the organic matter with acidified `(50%H_(2)SO_(4))` potassium dischromste solution.
BOD : The amount of oxygen used by the micro - organisms present in water during five days at `20^(@)C` is called Biochemical oxygen demand ( BOD ) . The BOD of pure water is about `1` ppm. If it is greater than `17` ppm it is highly polluted water.
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