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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.
Liquid-oxygen systems operate by cooling oxygen to -183Â°C and forcibly compressing it so it becomes a liquid. A large liquid-oxygen container is required, which the DME company refills on a scheduled basis. From this large container, a liquid portable system can be filled by the patient or family member.