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Chemical oxygen demand - History | | Chemical oxygen demand - History: Encyclopedia II - Chemical oxygen demand - History | | For many years, the strong oxidizing agent potassium permanganate (KMn04) was used for measuring chemical oxygen demand. Measurements were called oxygen consumed from permanganate, rather than the oxygen demand of organic substances. Potassium permanaganate's effectiveness at oxidizing organic compounds varied widely, and in many cases BOD measurements were often much greater than results from COD measurements. This indicated that potassium permanganate was not able to effectively oxidize all organic compounds in water, rendering it a re ...
See also:Chemical oxygen demand, Chemical oxygen demand - Overview, Chemical oxygen demand - History, Chemical oxygen demand - Using potassium dichromate, Chemical oxygen demand - Blanks, Chemical oxygen demand - Measurement of excess, Chemical oxygen demand - Calculations, Chemical oxygen demand - Inorganic interference, Chemical oxygen demand - Government regulation | | | Chemical oxygen demand, Chemical oxygen demand - Blanks, Chemical oxygen demand - Calculations, Chemical oxygen demand - Government regulation, Chemical oxygen demand - History, Chemical oxygen demand - Inorganic interference, Chemical oxygen demand - Measurement of excess, Chemical oxygen demand - Overview, Chemical oxygen demand - Using potassium dichromate | | |
| | | Chemical oxygen demand: Encyclopedia II - Chemical oxygen demand - History
Chemical oxygen demand - History
For many years, the strong oxidizing agent potassium permanganate (KMn04) was used for measuring chemical oxygen demand. Measurements were called oxygen consumed from permanganate, rather than the oxygen demand of organic substances. Potassium permanaganate's effectiveness at oxidizing organic compounds varied widely, and in many cases BOD measurements were often much greater than results from COD measurements. This indicated that potassium permanganate was not able to effectively oxidize all organic compounds in water, rendering it a relatively poor oxidizing agent for determining COD.
Since then, other oxidizing agents such as ceric sulfate, potassium iodate, and potassium dichromate have been used to determine COD. Of these, potassium dichromate (K2Cr2O7) has been shown to be the most effective: it is relatively cheap, easy to purify, and is able to nearly completely oxidize almost all organic compounds.
Other related archives0, BOD, Cr, International Organization for Standardization, K, L, Mn, N, O, Potassium dichromate, Switzerland, acidic, ammonia, biochemical oxygen demand, biologically, carbon dioxide, chloride, distilled water, environmental chemistry, governments, lakes, mass, mg, organic compounds, oxidizing agent, parts per million, pollutants, potassium dichromate, potassium permanganate, purify, redox, rivers, solution, sulfuric acid, surface water, titrated, wastewater, water, water quality
 Adapted from the Wikipedia article "History", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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