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What is the maximum valueof biological oxygen demand and minimum value of dissolved oxygen in a pure water body?

Dear student, the maximum value of biological oxygen demand is between 10mg/L to 300mg/L. The minimum value of dissolved oxygen in a pure water body is 2 mg/L. Less than this oxygen kills many organisms thereby calling it as dead zone. Thanks and regards

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The amount of oxygen required to oxidise organic substances present in pollutedd water is called Chemical oxygen demand.
It is an important  index for the amount of organic substances present in water.
COD is determined by oxidising the organic matter with acidified (50%H2SO4) potassium dichromate solution.
It is an important parameter for determining the quality of water.
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This question important for state board or CBSE exams 
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