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What is definition of chemical oxygen demand?

A measure of the amount of a water body's dissolved oxygen supply that would be used up
in completely oxidizing added inorganic oxidizable compounds–such as in the oxidation of
ammonia to nitrate. Biological oxygen demand (BOD) tests can only measure the biodegradable fraction of the total potential
dissolved oxygen consumption by added wastes; however, COD tests may be used to measure the
oxygen demand created by toxic organic or inorganic compounds as well as by biodegradable
substances. A standard COD test, therefore, can be used to evaluate many industrial type wastes
not readily analyzed for water quality factors by the sewage-oriented BOD test.

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