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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.
Oxygen Delivery and Consumption. Do2 is the amount of oxygen delivered to the tissues each minute and is described by the following equation: Do2 = Cao2 Ã CO Ã 10, where Cao2 is arterial oxygen content (the amount of oxygen carried in 100 mL of arterial blood) and CO is cardiac output.