Aerobic microorganisms in water, dissolved in water samples using oxygen, oxidation behavior in organic matter. Organic substances that can be decomposed by microorganisms are oxidized to carbon dioxide and water, and this effect is also consumed by the dissolved oxygen in the water. Therefore, the detection of oxygen consumed can be developed, evaluation of organic pollution water by Cheng. Water samples were collected in BOD flasks containing
, detection of adding manganous sulfate and alkaline iodide solution and sodium azide. Manganese production of manganese dioxide in alkaline conditions. The oxygen in the water will precipitate oxidation of hydrogen into high valence manganese oxide and manganese oxides, when the water after acidification,High manganese oxide iodine ion generation and dissolved oxygen of the same equivalent molecular iodine, sodium thiosulfate solution titration, its consumption amount can be dissolved oxygen in water samples were obtained.
water in the constant temperature of 20 DEG C culture box in the dark cultured for 5 days, the determination of water in aerobic microorganisms consumed during the dissolved oxygen (do), then the 5-day biochemical oxygen demand quantity (BOD5).
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