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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.
biochemical oxygen demand (BOD) amount of oxygen used by decomposers to break down a specific amount of organic matter. greater amount of organic matter (or influx of nutrients) increases BOD and decreases amount of O2available in water.