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2. Winkler titration - Wikipedia

   en.wikipedia.org/wiki/Winkler_titration

   The amount of dissolved oxygen is a measure of the biological activity of the water masses. Phytoplankton and macroalgae present in the water mass-produce oxygen by way of photosynthesis. Bacteria and eukaryotic organisms (zooplankton, fish) consume this oxygen through cellular respiration. The result of these two mechanisms determines the ...

3. Oxygen saturation - Wikipedia

   en.wikipedia.org/wiki/Oxygen_saturation

   Dissolved oxygen levels required by various species in the Chesapeake Bay (US). In aquatic environments, oxygen saturation is a ratio of the concentration of "dissolved oxygen" (DO, O 2), to the maximum amount of oxygen that will dissolve in that water body, at the temperature and pressure which constitute stable equilibrium conditions.

4. Wastewater quality indicators - Wikipedia

   en.wikipedia.org/wiki/Wastewater_quality_indicators

   Most aquatic habitats are occupied by fish or other animals requiring certain minimum dissolved oxygen concentrations to survive. Dissolved oxygen concentrations may be measured directly in wastewater, but the amount of oxygen potentially required by other chemicals in the wastewater is termed as oxygen demand. Dissolved or suspended oxidizable ...

5. Streeter–Phelps equation - Wikipedia

   en.wikipedia.org/wiki/Streeter–Phelps_equation

   The model describes how dissolved oxygen (DO) decreases in a river or stream along a certain distance by degradation of biochemical oxygen demand (BOD). The equation was derived by H. W. Streeter, a sanitary engineer, and Earle B. Phelps , a consultant for the U.S. Public Health Service , in 1925, based on field data from the Ohio River .

6. Biochemical oxygen demand - Wikipedia

   en.wikipedia.org/wiki/Biochemical_oxygen_demand

   BOD test bottles at the laboratory of a wastewater treatment plant. Biochemical oxygen demand (also known as BOD or biological oxygen demand) is an analytical parameter representing the amount of dissolved oxygen (DO) consumed by aerobic bacteria growing on the organic material present in a water sample at a specific temperature over a specific time period.

7. Oxygen sensor - Wikipedia

   en.wikipedia.org/wiki/Oxygen_sensor

   An oxygen analyser for breathing gas mixtures for diving. The type of oxygen sensor used in most underwater diving applications is the electro-galvanic oxygen sensor, a type of fuel cell, which is sometimes called an oxygen analyser or ppO 2 meter. They are used to measure the oxygen concentration of breathing gas mixes such as nitrox and ...

8. Help us pick the best picture. Vote with USA TODAY's Movie Meter

   www.aol.com/help-us-pick-best-picture-170032218.html

   Now we’re giving you a vote with the inaugural USA TODAY Movie Meter. Ten movies are vying for the top prize at the 97th Academy Awards on March 2, hosted by Conan O’Brien on ABC and Hulu (7 p ...

9. Fishing Creek (North Branch Susquehanna River tributary)

   en.wikipedia.org/wiki/Fishing_Creek_(North...

   The area around the tributary West Creek is the least habitable part of the Fishing Creek area, according to a 2011 study. The water quality of Fishing Creek can vary. Its pH ranges from 4.9 to 8.5, while the concentration of dissolved oxygen ranges from 5 to 17.5 mg per liter.