How can water pollution be measured?

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Question

(A) Water pollution,specifically organic pollution,is measured by the $BOD$ (Biochemical Oxygen Demand) test.$BOD$ refers to the amount of oxygen that

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Measurement of $BOD$

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(A) Water pollution,specifically organic pollution,is measured by the $BOD$ (Biochemical Oxygen Demand) test.$BOD$ refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria.Greater $BOD$ indicates higher levels of organic pollution in the water body.Therefore,measuring $BOD$ is the standard method to assess the degree of water pollution.

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