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• W76428131 abstract "Current chemical oxygen demand (COD) analyses generate wastes containing hexavalent and trivalent chromium, mercury, and silver. Waste disposal is difficult, expensive, and poses environmental hazards. A new COD test is proposed that eliminates these metals and shortens analysis time, where trivalent manganese oxidant replaces hexavalent chromium (dichromate). A silver catalyst is not required. Optional pretreatment removes chloride via oxidation to chlorine using sodium bismuthate, eliminating the need for mercury. Sample aqueous and solid components are separated for chloride removal, then recombined for total COD measurement. Soluble and nonsoluble COD can be determined separately. Digestion at 150 degrees C is complete in 1 hour. Results are determined by titration or by spectrophotometric reading. Test wastes contain none of the metals regulated for disposal under the Resource Conservation and Recovery Act. Results are shown for selected organic compounds and various wastewaters. Statistical comparisons are made with dichromate COD and biochemical oxygen demand (BOD5) test values." @default.
• W76428131 created "2016-06-24" @default.
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• W76428131 date "2001-01-01" @default.
• W76428131 modified "2023-10-01" @default.
• W76428131 title "Chemical Oxygen Demand Analysis of Wastewater Using Trivalent Manganese Oxidant with Chloride Removal by Sodium Bismuthate Pretreatment" @default.
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• W76428131 doi "https://doi.org/10.2175/106143001x138705" @default.
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