The initial DO of a river water sample is 8.5 mg/L After incubation at for 5 days, the DO was reduced to 5.2 mg/L. What is the BOD of the sample?
3.3 mg/L
1.6 mg/L
6.9 mg/L
2.8 mg/L
BOD = Initial DO - Final DO
BOD = 8.5 - 5.2
BOD = 3.3 mg/L
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