Chemical Oxygen Demand

What is Chemical Oxygen Demand (COD)?

In this article, we will understand the definition of Chemical Oxygen Demand (COD). To understand the meaning of Biological Oxygen Demand, click on the link.

The higher amounts of waste in water increase the rates of decomposition and O2 consumption thereby decreasing the Dissolved Oxygen (DO) content of water.

As the waste amount increases, it requires more oxygen for its decomposition. This Oxygen Demand can be classified into two types-

1. Chemical Oxygen Demand (COD), and

2. Biological Oxygen Demand (BOD)


1. Chemical oxygen demand (COD) is a slightly better mode used to measure pollution load in the water.

2. COD measures the amount of oxygen in parts per million required to oxidize organic (biodegradable and non-biodegradable) and oxidizable inorganic compounds in the water sample.

What is Biological Oxygen Demand(BOD)? Click the Link for an Answer.



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