Determination of Biochemical Oxygen Demand (BOD5)
f. Measure volume of 0.0250N sodium sulfite used. 3. Sample Pretreatment. a. Obtain another 200 ml portion of the same sample used in Step 2. b. Add to the sample the same volume of 0.0250N sodium sulfite solution that was determined in Step 2.e and mix. c. Retest for residual chlorine after allowing the sample to stand for 10 20 minutes. d. ................
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