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Dissolved Oxygen in the River

The solubility of gases, including oxygen and nitrogen in river water, is influenced by three main factors: temperature, pressure, and aeration. Increased temperature reduces gas solubility, while higher pressure enhances it, exemplified by carbonated drinks. Aeration improves gas dissolution due to greater surface area exposure. Insufficient dissolved oxygen levels can lead to fish mortality, especially during hot weather, whereas excessively high levels (over 110% saturation) can cause gas bubble disease, obstructing blood flow and impacting aquatic life.

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Dissolved Oxygen in the River

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  1. Dissolved Oxygen in the River

  2. Solubility of gases Depends on three factors: 1) temperature 2) pressure 3) aeration

  3. Temperature If you increase the temperature you decrease the solubility of a gas.

  4. Pressure If you increase the pressure you increase the solubility of a gas. -example- pop cans- When you open it the pressure decreases so the gas fizzes out.

  5. Aeration Mixing or movement causes more gas to dissolve because of increased surface area exposed to the gas.

  6. Dissolved O2 and N2 in water • Too little oxygen- fish die • -caused by many hot days is a row • - oxygen levels fall below lower limit for survival.

  7. Too much oxygen and nitrogen (110% to 124% saturation) • Gas bubble disease • Nitrogen-gas bubbles block the flow of blood. • Diagnosed by gas bubbles in the gills of the dead fish • Can occur at the base of a dam.

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