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The Chemical Oxygen Demand(COD) by potassium permanganate and potassium dichromate is used as a measure of the organic matter content of a sample. Newly proposed K₂Cr₂O₇ analysis method to be list at Korean Official Method was made from analysis and comparison of the experimental process on Japanese Industrial Standard(JIS), American Open Reflux and Closed Reflux Methods. New K₂Cr₂O₇ method had better the qualitative and reproducible COD results than another methods as a result of the tested four times repeatedly by using Lakes water and Plant wastewater. The COD data ratio by KMnO₄ and K₂Cr₂O₇ methods was 2~3, 3, 2~17 and 3~4 times respectively when its data had compared with the lakes water and treated water of domestic and experimental wastewater, and raw wastewater which is generated at the manufacturing process of 6 steps and treated wastewater of chemistry source. Its ratio indicated to 2-4 and 2-3 times respectively on raw wastewater and plant wastewater of Chemistry, rubber and plastic, fiber, metal molding source. Oxidation ratio of benzene and ethyl benzene by KMnO₄ method was nearly zero, but the oxidation ratio by K₂Cr₂O₇ method was 50%, 70% respectively. Also, Oxidation ratio of phenol by KMnO₄ and K₂Cr₂O₇ methods was 80%, 100% respectively, and trichloroethylene and tetrachloroethylene were not nearly oxydized by KMnO₄ and K₂Cr₂O₇ methods. As the above contents, oxidation ratio and COD results by KMnO₄ and K₂Cr₂O₇ were different from various compounds and samples respectively.
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UCI(KEPA) : I410-ECN-0101-2009-517-012399849
