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Oct 30, 2018 · Biochemical oxygen demand or biological oxygen demand (BOD) is a measure of the amount of Dissolved Oxygen (DO) required by aerobic microorganisms to decompose organic matter present in a sample of water at a certain temperature over a studied period. BOD value is usually expressed in milligrams of oxygen per liter of water (mg/L).

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By definition, chemical oxygen demand is “a measure of the oxygen equivalent of the organic matter content of a sample that is suscep-tible to oxidation by a strong chemical oxidant.”* Oxy- Oxygen Demand, Chemical - Hach. 7. Insert the vial in the preheated DRB200 reactor. Close the lid. 8. Keep the vial in the reactor for 2 hours. 9. When

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What is Chemical Oxygen Demand (COD)? Chemical oxygen demand (COD) is the amount of dissolved oxygen that must be present in water to oxidize chemical organic materials, like petroleum. COD is used to gauge the short-term impact wastewater effluents will have on the oxygen levels of receiving waters. COD versus BOD

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