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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.
A chemical oxygen demand test works on the basis that nearly all organic compounds can be oxidized to carbon with a strong oxidizing agent in the presence of acid. Many governments around the world regulate the maximum chemical oxygen demand allowed in wastewater.