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hour time period is mandatory for EPA approved methods, but COD readings for non- digestion of up to 15 or 30 reagent vials (16 mm diameter). They.
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Pre-filled with COD reagents, these digestion vials come in either EPA-approved or mercury-free versions for low-, standard-, and ultra-high-range analysis.
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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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The EPA does not allow a modification of the reagents used for reporting purposes. You must use all specified reagents in the COD vial.
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