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Question
The BOD of three samples of water labelled A, B and C were recorded as 20 mg/L, 8mg/L and 400 mg/L, respectively. Which sample of water is the most polluted?
The BOD of three samples of water labelled A, B and C were recorded as 20 mg/L, 8mg/L and 400 mg/L, respectively. Which sample of water is the most polluted?
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Solution
The correct option is C Sample C
Biochemical oxygen demand (BOD) can be defined as the amount of oxygen in milligrams required for five days in one litre of water at 20∘C for the degradation of organic matter by the microorganisms. It estimates the amount of biodegradable organic matter in the sample. Higher the BOD, more polluted is the water sample. Hence, sample C, which has a BOD of 400 mg/L, is the most polluted sample of water.
Biochemical oxygen demand (BOD) can be defined as the amount of oxygen in milligrams required for five days in one litre of water at 20∘C for the degradation of organic matter by the microorganisms. It estimates the amount of biodegradable organic matter in the sample. Higher the BOD, more polluted is the water sample. Hence, sample C, which has a BOD of 400 mg/L, is the most polluted sample of water.
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