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1. • • Oxygen concentrations are much higher in air, which is about 21% oxygen, than in water, which is a tiny fraction of 1 percent oxygen. Where the air and water meet, this tremendous difference in concentration causes oxygen molecules in the air to dissolve into the water.
     www.waterontheweb.org/under/waterquality/oxygen.html

     Water on the Web | Understanding | Water Quality | Parameters

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   What is dissolved oxygen in water?

   • Dissolved oxygen (DO) is a measure of how much oxygen is dissolved in the water - the amount of oxygen available to living aquatic organisms. The amount of dissolved oxygen in a stream or lake can tell us a lot about its water quality. • Water Science School HOME • Water Properties topics • Water Quality topics • Sources/Usage: Public Domain.

   Dissolved Oxygen and Water | U.S. Geological Survey - USGS.gov

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   What is dissolved oxygen (DO) and why is it important?

   • What is dissolved oxygen (DO) and why is it important in water? Dissolved oxygen (DO) level is the available oxygen in a body of water for organisms to consume. In other words, the amount of extra oxygen that diffuses from the air into the water, or added by aquatic plants, and not the H 2 O oxygen part of the molecule.

   Understanding the Difference: ORP vs Dissolved Oxygen (DO)

   atlas-scientific.com/blog/understanding-the-difference-orp-vs-dissolved-oxygen-do/

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   How does dissolved oxygen enter water?

   • There are two ways that dissolved oxygen enters water, either from photosynthesis from aquatic plants or through diffusion with the surrounding air. Oxygen is also consumed in the water by respiration of aquatic animals and plants, decomposition of organic matter by microorganisms, and different chemical reactions.

   Dissolved Oxygen - Cary Institute of Ecosystem Studies

   www.caryinstitute.org/news-insights/2-minute-science/dissolved-oxygen

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   How much dissolved oxygen should be dissolved in water?

   • For waters that support warm water fishes, the objective requires that the dissolved oxygen concentration shall not fall below 5 to 6 mg/l (depending on the region of California). Some Regional Water Boards describe objectives in terms of percent saturation. For example, the dissolved oxygen shall not fall below 80% saturation.

   Dissolved Oxygen (DO) - Water Boards

   www.waterboards.ca.gov/water_issues/programs/swamp/docs/cwt/guidance/3110en.pdf

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   Why does hot water hold less dissolved oxygen than cold water?

   • Warm water holds less dissolved oxygen than cold water. The lowest levels of DO usually occur in the morning, because photosynthesis stops at night while respiration continues. Water at higher altitudes holds less oxygen. Fast-moving water generally has more oxygen than still water, because the movement mixes the air into the water.

   Dissolved Oxygen - Cary Institute of Ecosystem Studies

   www.caryinstitute.org/news-insights/2-minute-science/dissolved-oxygen

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   How does dissolved oxygen affect air saturation?

   • This is often coupled with higher water temperatures, which also affects saturation. ¹² At higher temperatures, water becomes 100% saturated at lower concentrations, so higher dissolved oxygen concentrations mean even higher air saturation levels. A dead zone is an area of water with little to no dissolved oxygen present.

   Dissolved Oxygen - Environmental Measurement Systems

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3. atlas-scientific.com › blog › understanding-theUnderstanding the Difference: ORP vs Dissolved Oxygen (DO)

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   Mar 24, 2021 · What is dissolved oxygen (DO) and why is it important in water? Dissolved oxygen (DO) level is the available oxygen in a body of water for organisms to consume. In other words, the amount of extra oxygen that diffuses from the air into the water, or added by aquatic plants, and not the H 2 O oxygen part of the molecule. These dissolved oxygen ...

4. www.usgs.gov › science › dissolved-oxygen-and-waterDissolved Oxygen and Water | U.S. Geological Survey - USGS.gov

   www.usgs.gov › science › dissolved-oxygen-and-water

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   Jun 5, 2018 · Dissolved oxygen (DO) is a measure of how much oxygen is dissolved in the water - the amount of oxygen available to living aquatic organisms. The amount of dissolved oxygen in a stream or lake can tell us a lot about its water quality.

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6. www.waterontheweb.org › under › waterqualityWater on the Web | Understanding | Water Quality | Parameters

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   Mar 28, 2017 · As water moves past their gills (or other breathing apparatus), microscopic bubbles of oxygen gas in the water, called dissolved oxygen (DO), are transferred from the water to their blood. Like any other gas diffusion process, the transfer is efficient only above certain concentrations.

7. www.caryinstitute.org › dissolved-oxygenDissolved Oxygen - Cary Institute of Ecosystem Studies

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   There are two ways that dissolved oxygen enters water, either from photosynthesis from aquatic plants or through diffusion with the surrounding air. Oxygen is also consumed in the water by respiration of aquatic animals and plants, decomposition of organic matter by microorganisms, and different chemical reactions.

8. basicwaterscience.com › dissolved-oxygen-in-waterDissolved Oxygen in Water - Basic Water Science 101

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   The dissolved oxygen content may be reported in terms of the actual concentration or as a percentage of saturation. The ultimate source of oxygen in water exposed to air is the atmosphere, but some oxygen is contributed by as a byproduct of photosynthesis.

9. www.waterboards.ca.gov › water_issues › programsDissolved Oxygen (DO) - Water Boards

   www.waterboards.ca.gov › water_issues › programs

   Oxygen is added to water by: Re-aeration: Oxygen from air is dissolved in water at its surface, mostly through turbulence. Examples of this include: Water tumbling over rocks (rapids, waterfalls, riffles) Wave action. Photosynthesis (during daylight) Plants produce oxygen when they photosynthesize.

10. www.fondriest.com › water-quality › dissolved-oxygenDissolved Oxygen - Environmental Measurement Systems

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    Dissolved oxygen enters water through the air or as a plant byproduct. From the air, oxygen can slowly diffuse across the water’s surface from the surrounding atmosphere, or be mixed in quickly through aeration, whether natural or man-made 7.