Biology, 26.04.2020 06:59 cschuessler3
One method used to measure water pollution by organic waste is to calculate the biological oxygen demand, BOD. This determines the rate at which oxygen is used by micro-organisms in the water.
To determine the BOD of water, a sample of water is taken from the sea or river and the concentration of oxygen is measured.
The sample is then placed in a tube with an airtight seal and kept at 20*C for five days. The concentration of oxygen is then measured again.
The fall in oxygen concentration is the BOD.
Suggest why the airtight seals are placed on the tubes.
Answers: 1
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