Along with the potassium dichromate in fifty% sulfuric acid Answer, pre-well prepared COD vials also contain silver sulfate being a catalyst and mercuric sulfate to get rid of chloride interference. Hence, COD vials are regarded harmful waste and have to be managed and disposed of within an approved method.
Dissolve sodium hydroxide and sodium iodide (NaI) in distilled h2o to help make a 1000 ml Answer. Then include and dissolve sodium azide in the solution.
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To neutralize the chlorine, add the prescribed volume of sodium sulphite Option towards the sample. The chlorine interferes with the appropriate measurement in the BOD price. Therefore it must be neutralized.
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If you can find any toxic compounds present during the h2o sample, the microbial action on the microorganisms is disturbed, So bringing about lessened BOD values.
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The quantity of oxygen, taken up by the microorganisms that decompose the organic waste make any difference in wastewater is recognized as Organic oxygen demand or biochemical oxygen click here need.
Figuring out the BOD stage allows in making insightful decisions about new projects Which may have an effect about the ecosystem and the maritime ecosystem. BOD also allows in examining the effectiveness of wastewater therapy crops.
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