The chemical oxygen demand (COD) of a body of water is determined using a(n)

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The chemical oxygen demand (COD) measures the amount of oxygen required to oxidize all organic and inorganic substances in a water sample. This is typically achieved through the use of a strong oxidizing agent, such as potassium dichromate or potassium permanganate. By adding a measured amount of the oxidizing agent to the water sample and allowing it to react with the organic material, the amount of residual oxidizing agent can be determined, which is directly proportional to the amount of organic material present in the sample. Therefore, option A is the best choice for determining the COD of a body of water.

The Chemical Oxygen Demand (COD) of a Body of Water