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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.
Home Find by Parameter. Biological Oxygen Demand (BOD) is a laboratory test that calculates the oxygen demand of a discrete sample incubated over five days, used to indicate water quality.efinition. Biological Oxygen Demand (BOD) is a laboratory test that calculates the oxygen demand of a discrete sample incubated over five days, used to indicate water quality. Alternative recognised methodologies such as TOC (Total Organic Carbon) allow continuous measurement and the prediction of poor water quality.