The reagents and samples are processed for 2 hours at a temperature of 150°C. The 2- hour time period is mandatory for EPA approved methods, but COD readings
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Hach's USEPA-approved dichromate COD Method is the most widely used chemical oxygen demand (COD) method for NPDES reporting in the world.
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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.
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