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COD or Chemical Oxygen Demand definition. Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as Ammonia and nitrite.
Definition - What does Chemical Oxygen Demand (COD) mean? A chemical oxygen demand (COD) test is a test that is used to measure the organic compounds in water. It is most commonly used to measure the amounts of organic compounds in surface water, such as rivers and lakes, and wastewater. Chemical oxygen demand testing is a useful measure of water quality. COD is expressed in milligrams per liter (mg/L).