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In doing Biochemical oxygen demand (B.O.D) what does sodium thiosulphate do and why is starch use...

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Biology

In doing Biochemical oxygen demand (B.O.D) what does sodiumthiosulphate do and why is starch use as indicator?

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Biological Oxygen in Demand BOD is the amount of the oxygen dissolved in the water used or required by the aerobic organisms in the water for the biological degradation of the organic material in the water The BOD test is carried out to determine the presence of amount of the Oxygen in the sample    See Answer
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