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  4. Measurement of rate of O2 utilisation by a unit volume of water over a period of time is to measure :

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Q. Measurement of rate of $O_{2}$ utilisation by a unit volume of water over a period of time is to measure :

Haryana PMTHaryana PMT 2002

Solution:

Biological Oxygen Demand $(BOD)$ in simple terms is the amount of oxygen that would be used by the decomposing bacteria to decompose or break down the organic compounds in the water body. The increase in the $BOD$ reflects that the concentration of the organic mass is tremendous and so a large amount of oxygen would be claimed by the bacteria. This results in the deficiency of the dissolved oxygen in the water and adversely affects the aquatic life due to hypoxia. So, the $BOD$ can be defined as the measurement of the rate of oxygen utilization by a unit volume of water over a period of time.