3. What would happen to the dissolved oxygen in the Missouri River if large amounts of waste were dumped into?

Which sample is most likely obtained from river water upstream of all major cities?

  • A student collected the following data when doing a biochemical oxygen demand test on four samples of water from a river. DISSOLVED OXYGEN CONCENTRATION : Sample I: Start 10 mg/L ----- End 7.0 mg/L Sample II: Start 9.0 mg/L ----- End 8.0 mg/L Sample III: Start 10 mg/L -----End 9.0 mg/L Sample IV: Start 6.0 mg/L ---- End 3.0 mg/L Based on the data, which sample is most likely obtained from river water upstream of all major cities? A. Sample I B. Sample II C. Sample III D. Sample IV

  • Answer:

    C

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