200ml of river water was collected from just downstream of the brewery. 2ml of river water
diluted to 250ml, aerated and seeded. The dissolved oxygen content was 7.6mg/l initially. After 5
days, the dissolved oxygen content had dropped to 5.7mg/l. A second sample was obtained 60
days later and retested in identical fashion. The intial dissolved oxygen was 7.5mg/l and afther 5
days, dropped to 5.3mg/l.
a. What is the BOD for each of the samples?
b. How is it relevant to collect sample after 60days?
c. Which water sample was clear?
d. Comment about the ultimate BOD.
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