Determination of Biochemical Oxygen Demand (BOD5)
2. Alkali-iodide-azide reagent: Dissolve 500 g NaOH and 135 g NaI in reagent water. Dilute to 1 L. Add 10 g NaN3 dissolved in 40 ml reagent water. This reagent should not give a color with starch solution when diluted and acidified. 3. Concentrated Sulfuric acid . 4. Standard sodium thiosulfate titrant, 0.0250N: Purchase commercially. 5. ................
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