chemical oxygen demand
KEM-ih-kul OK-sih-jen dih-MAND
ˈkɛmɪkəl ˈɒksɪdʒən dɪˈmɑːndListen
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a standard water quality test that measures the amount of oxygen required to chemically oxidise all organic and inorganic compounds in a water sample; expressed in milligrams of oxygen per litre of water; a high chemical oxygen demand indicates a large concentration of oxidisable pollutants and a heavily polluted water body; widely used alongside biological oxygen demand to assess the pollution load of industrial effluents, sewage, and surface waters; used by environmental regulators to set discharge standards for wastewater treatment plants and industrial facilities discharging to waterways
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