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The EPA does not allow a modification of the reagents used for reporting purposes. You must use all specified reagents in the COD vial.
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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Hach offers complete systems for chemical oxygen demand (COD) analysis, with prepared COD reagents, a reactor, and spectrophotometers and.
