Readers ask: What Physical Forces Or Conditions Affect The Dissolved Oxygen Content Of Water?

What physical forces or conditions affect the dissolved oxygen content of water 2 points?

Dissolved oxygen concentrations are constantly affected by diffusion and aeration, photosynthesis, respiration and decomposition. While water equilibrates toward 100% air saturation, dissolved oxygen levels will also fluctuate with temperature, salinity and pressure changes ³.

What processes increase dissolved oxygen concentration?

Cold water holds more oxygen than warm water. Photosynthesis contributes to an increase in dissolved oxygen levels during the day. However, there are biological processes in water that consume oxygen such as respiration by organisms and decomposition of organic matter by microorganisms.

What reduces dissolved oxygen in water?

Low dissolved oxygen (DO) primarily results from excessive algae growth caused by phosphorus. Nitrogen is another nutrient that can contribute to algae growth. As the algae die and decompose, the process consumes dissolved oxygen.

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What are the factors influencing the solubility of oxygen in water?

Normally, oxygen solubility is strongly dependent on (1) the amount of dissolved electrolyte salt(s) (decreases at higher concentration of electrolyte), (2) temperature (decreases at higher temperatures), and (3) pressure (increases at higher pressure).

What happens if dissolved oxygen is too high?

Too much dissolved oxygen is not healthy, either. Extremely high levels of dissolved oxygen usually result from photosynthesis by a large amount of plants. Great uncontrolled plant growth, especially algal blooms, is often the result of fertilizer runoff. This phenomenon is called cultural eutrophication.

What are 3 factors that influence dissolved oxygen levels?

NATURAL FACTORS INFLUENCING DISSOLVED OXYGEN

  • Aquatic life- animals living in water use up dissolved oxygen.
  • Elevation- the amount of oxygen in elevation increases.
  • Salinity (saltiness)- Salty water holds less oxygen than fresh water.
  • Temperature- cold water holds more dissolved oxygen than warm water.

What is dissolved oxygen and why is it important?

Dissolved oxygen (DO) is one of the most important indicators of water quality. It is essential for the survival of fish and other aquatic organisms. Oxygen dissolves in surface water due to the aerating action of winds. Oxygen is also introduced into the water as a byproduct of aquatic plant photosynthesis.

Does salinity affect dissolved oxygen?

As the salinity of water increases, its ability to dissolve oxygen decreases.

Is high dissolved oxygen good?

A high dissolved oxygen (DO) level in a community water supply is good because it makes drinking water taste better. However, high DO levels speed up corrosion in water pipes. For this reason, industries use water with the least possible amount of dissolved oxygen.

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What causes high dissolved oxygen in water?

Cold water can hold more dissolved oxygen than warm water. In winter and early spring, when the water temperature is low, the dissolved oxygen concentration is high. In summer and fall, when the water temperature is high, the dissolved-oxygen concentration is often lower.

What is a good level of dissolved oxygen in water?

Water at lower temperatures should have higher mg/L of dissolved oxygen and higher %DO while warmer, polluted waters will have lower mg/L and %DO. Healthy water should generally have dissolved oxygen concentrations above 6.5-8 mg/L and between about 80-120 %.

How do you estimate dissolved oxygen in water?

Dissolved oxygen levels can be measured by a basic chemical analysis method (titration method), an electrochemical analysis method (diaphragm electrode method), and a photochemical analysis method (fluorescence method). The diaphragm electrode method is the most widely used method.

What are the 4 factors that affect solubility?

– Hence, we can conclude that the four factors which affect the solubility of ionic compounds are common ion effect, temperature, solute-solvent interaction and molecular size.

Does pH affect solubility?

For ionic compounds containing basic anions, solubility increases as the pH of the solution is decreased. For ionic compounds containing anions of negligible basicity (such as the conjugate bases of strong acids), solubility is unaffected by changes in pH.

What is the solubility of oxygen?

Oxygen has a low solubility in aqueous medium. Its solubility in distilled water is only about 7 mg L1 at 30°C. This amount of oxygen is quickly consumed in aerobic cultures and must be constantly replaced by air sparging.