COD measurement is particularly valuable to determine amount of organic matter in water which contains toxic or antimicrobial chemicals. The test for biochemical oxygen demand BOD is a bioassay procedure that measures the oxygen consumed by bacteria.
Chemical Oxygen Demand Cod In Water Chemical Oxygen Wastewater
Because of its unique chemical properties the dichromate ion Cr2O72- is the specified oxidant in Methods 5220 B C and D.
. Chemical oxygen demand COD. Measured as biochemical or chemical oxygen demand. It is a significant parameter to determinate water characteristic.
Introduction Chemical oxygen demand COD is defined as the amount of a specified oxidant that reacts with the sample under controlled conditions. COD is amount of oxygen needed for oxidation of organic matter present in water by strong chemical oxidizing agents such as K2Cr2O7. All organic compounds may convert into carbon dioxide water and ammonia.
In the test an excess of manganeseII salt iodide I and hydroxide OH ions are added to a water sample causing. COD is used to gauge the short-term impact wastewater effluents will have on the oxygen levels of receiving waters. The quantity of oxidant consumed is expressed in terms of its oxygen equivalence.
Chemical Oxygen Demand indicates the amount of oxygen required to oxidize all soluble and particulate organic substances in water under specific conditions. Dissolved oxygen DO is widely used in water quality studies and routine operation of water reclamation facilities to analyze its level of oxygen saturation. The Winkler test is used to determine the concentration of dissolved oxygen in water samples.
Tchobanoglous and Schroeder 1985. Oxygen demand is a measure of the amount of oxidizable substances in a water sample that can lower DO concentrations Nemerow 1974. Chemical oxygen demand COD is the amount of dissolved oxygen that must be present in water to oxidize chemical organic materials like petroleum.
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