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Standard XII
Chemistry
BOD and COD
Question

The amount of oxygen required to oxidise organic substances present in water is called:
  1. Dissolved oxygen (DO)
  2. Chemical oxygen demand (COD)
  3. Biochemical oxygen demand (BOD)
  4. The threshold limit value (TLV)

A
Biochemical oxygen demand (BOD)
B
The threshold limit value (TLV)
C
Chemical oxygen demand (COD)
D
Dissolved oxygen (DO)
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Solution
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COD is the chemical oxygen demand. The amount of oxygen required to oxidise organic substances present in polluted water is called chemical oxygen demand (COD). It is an index for the amount of organic substances present in water. It is expressed in milligrams per litre (mg/L), also referred to as ppm (parts per million).

The amount of oxygen used by suitable microorganisms present in water for five days at 20oC is called biochemical oxygen demand (BOD).

Hence, the correct option is B.

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