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Environmental Chemistry — quick quiz

5 real NSEC questions on Environmental Chemistry. Instant scoring and solutions, no signup — see where you stand in ~3 minutes.

Question 1 of 4

HARD

A water sample from an industrial area has a BOD value of 45 mg/L. If the dissolved oxygen content is 3.5 mg/L and the saturation DO at that temperature is 9.0 mg/L, what is the approximate oxygen deficit in this water sample?