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chemical oxygen demand (COD)
(english) A term for the chemical oxygen consumption. COD is a measure of the amount of organic matter which can be oxidized by a strong chemical oxidant. It is expressed as the amount of oxygen which is equivalent to the oxidant used. The oxygen equivalent of the dichromate consumed during oxidation of a raw water sample. The chemical oxygen demand (COD) is a measure of organic matter and often permits an estimation of the BOD. COD determinations in brackish and marine waters are disturbed by the salt-matrix which can be removed.

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