Determination of Biochemical Oxygen Demand (BOD5)

2. To two of the three BOD bottles, add 1 ml MnS04 solution, followed by 1 ml alkali-iodide-azide reagent. Submerge pipette tips in sample when adding reagents. Rinse tips well between uses. 3. Stopper carefully to exclude air bubbles; mix by inverting bottle several times. 4. ................
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