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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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Cite this article
AILSA ALLABY and MICHAEL ALLABY. "chemical oxygen demand." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. AILSA ALLABY and MICHAEL ALLABY. "chemical oxygen demand." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-chemicaloxygendemand.html AILSA ALLABY and MICHAEL ALLABY. "chemical oxygen demand." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-chemicaloxygendemand.html |
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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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Cite this article
MICHAEL ALLABY. "chemical oxygen demand." A Dictionary of Ecology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "chemical oxygen demand." A Dictionary of Ecology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O14-chemicaloxygendemand.html MICHAEL ALLABY. "chemical oxygen demand." A Dictionary of Ecology. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-chemicaloxygendemand.html |
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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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Cite this article
MICHAEL ALLABY. "chemical oxygen demand." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "chemical oxygen demand." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O7-chemicaloxygendemand.html MICHAEL ALLABY. "chemical oxygen demand." A Dictionary of Plant Sciences. 1998. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-chemicaloxygendemand.html |
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