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Chemical Oxygen Demand (COD) Methods and Procedure May 20, 2021 This is done in an attempt to reduce the hazardous waste generated and reduce the cost of the test by eliminating the more expensive chemicals. Chemical Oxygen Demand (COD) Testing Kits | CHEMetrics A COD test typically involves digestion of a water sample in a sealed vial with potassium dichromate and sulfuric acid at 150oC for 2 hours. Why test for COD? Wastewater Treatment Laboratory Week 1 – TN.gov Jan 16, 2013 1:30 B...