Source: wikibot/chemical-oxygen-demand
= Chemical oxygen demand
{wiki=Chemical_oxygen_demand}
Chemical Oxygen Demand (COD) is a measure of the amount of organic compounds in water or wastewater that can be oxidized by a strong chemical oxidant. It is an important parameter used to evaluate water quality, particularly in the context of wastewater and effluent treatment. COD is expressed in units of milligrams of oxygen consumed per liter of sample (mg O₂/L).