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Chemical Oxygen Demand (COD) 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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The chemical scale of atomic masses was based on oxygen being, in this context, the ordinary mixture of isotopes. The nature of isotopes will be described in detail later. Atmospheric oxygen contains 99.758% of the isotopef 16 0, 0.0373% of 1 7 0, and 0.2039% of 1 8 0. The weighted mean is 16.004462.

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