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chemical oxygen demand

chemical oxygen demand (COD) Indicator of water or effluent quality, which measures oxygen demand by chemical (as distinct from biological) means, using potassium dichromate as the oxidizing agent. Oxidation takes two hours and the method is thus much quicker than an assessment of biological oxygen demand (BOD), which takes five days. Since the BOD: COD ratio is fairly constant for a given effluent, COD is used more frequently than BOD for the routine monitoring of an effluent once this ratio has been determined.

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"chemical oxygen demand." A Dictionary of Earth Sciences. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"chemical oxygen demand." A Dictionary of Earth Sciences. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chemical-oxygen-demand

"chemical oxygen demand." A Dictionary of Earth Sciences. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chemical-oxygen-demand

chemical oxygen demand

chemical oxygen demand (COD) An indicator of water or effluent quality, which measures oxygen demand by chemical (as distinct from biological) means, using potassium dichromate as the oxidizing agent. Oxidation takes 2 hours and the method is thus much quicker than a 5-day BOD (see biological oxygen demand) assessment. Since the BOD:COD ratio is fairly constant for a given effluent, COD is used more frequently for routine monitoring of an effluent once this ratio has been determined.

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"chemical oxygen demand." A Dictionary of Ecology. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"chemical oxygen demand." A Dictionary of Ecology. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chemical-oxygen-demand-0

"chemical oxygen demand." A Dictionary of Ecology. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chemical-oxygen-demand-0

chemical oxygen demand

chemical oxygen demand (COD) An indicator of water or effluent quality, which measures oxygen demand by chemical (as distinct from biological) means, using potassium dichromate as the oxidizing agent. Oxidation takes 2 hours and the method is thus much quicker than a 5-day BOD assessment. Since the BOD: COD ratio is fairly constant for a given effluent, COD is used more frequently for routine monitoring of an effluent once this ratio has been determined.

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"chemical oxygen demand." A Dictionary of Plant Sciences. . Encyclopedia.com. 17 Aug. 2017 <http://www.encyclopedia.com>.

"chemical oxygen demand." A Dictionary of Plant Sciences. . Encyclopedia.com. (August 17, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chemical-oxygen-demand-1

"chemical oxygen demand." A Dictionary of Plant Sciences. . Retrieved August 17, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/chemical-oxygen-demand-1