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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.
An oxygen conserving device provides. a âbolusâ or burst of oxygen during the. inspiratory phase of a typical breathing cycle. Oxygen conserving devices are often called. âpulse doseâ devices. Your physician will. prescribe a specific âpulse dose settingâ. to meet your oxygenation needs.