Chemical oxygen demand

<p>In <a href="/facts/Environmental_chemistry/ByvgBKNs">environmental chemistry</a>, the chemical oxygen demand (COD) is an indicative measure of the amount of <a href="/facts/Oxygen/acyn6o8r">oxygen</a> that can be consumed by <a href="/facts/Chemical_reaction/GpqWlKrz">reactions</a> in a measured <a href="/facts/Solution_(chemistry)/MGchhMQV">solution</a>. It is commonly expressed in <a href="/facts/Mass/HHdc8XmF">mass</a> of oxygen consumed over <a href="/facts/Volume/aeAXCBUd">volume</a> of solution, which in SI units is milligrams per liter (<a href="/facts/Milligram/lU2zbPk8">mg</a>/<a href="/facts/Litre/QKwbQz8I">L</a>). A COD test can be used to quickly quantify the amount of <a href="/facts/Organic_compound/gqCNaN45">organics</a> in <a href="/facts/Water/0lkXnJPK">water</a>. The most common application of COD is in quantifying the amount of oxidizable <a href="/facts/Pollutant/4f9kmFzq">pollutants</a> found in <a href="/facts/Surface_water/KQCY5RcY">surface water</a> (e.g. <a href="/facts/Lake/YP0xxn0E">lakes</a> and <a href="/facts/River/GxdjEX21">rivers</a>) or <a href="/facts/Wastewater/g6Bn8xvT">wastewater</a>. COD is useful in terms of <a href="/facts/Water_quality/PcEERmpX">water quality</a> by providing a metric to determine the effect an <a href="/facts/Effluent/HPS1Akbo">effluent</a> will have on the receiving body, much like <a href="/facts/Biochemical_oxygen_demand/8vDcugIo">biochemical oxygen demand (BOD)</a>.
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Chemical oxygen demand open-in-new

Chemical oxygen demand