Determination of Biochemical Oxygen Demand (BOD5)

For unknown samples, check the pH of the dilution which uses the most sample to confirm that the dilutions lie in the proper pH range. As needed neutralize samples with 1N sulfuric acid or 1N sodium hydroxide. Do not dilute the sample with the acid or base by more than 0.5% (1.5 ml in a 300 ml BOD bottle). 2. Test final effluent for residual ... ................
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