DO or Dissolved Oxygen Refers to the Level of Free and Unmixed Oxygen in Water or Other Liquids. The Measurement of This Parameter is One of the Most Important Analyzes in Quality Control of Water Parameters, Wastewater Treatment and Corrosion of Materials Studies. Organisms in Water Get their Oxygen from the Atmosphere and Plants.
Among the Gases in the Air, Oxygen and Nitrogen Gases Have Low Solubility, which Directly Depends on Their Partial Pressure. The Liquid Dissolves Oxygen until the Partial Pressure of Oxygen in the Liquid is in Equilibrium with the Air or Gas It Is in Contact with. The Two Main Types of DO Measurement Technology Include Electrochemical Method and Optical Method. In the Electrochemical Method, the Amount of Dissolved Oxygen is Measured in an Electrode that Includes the Cathode, Anode, Electrolyte Solution, and Oxygen Permeable Membrane, but in the Optical Method, the Amount of DO is Determined by Using Light Radiation and Measuring the Emitted Light in the Luminescence Phenomenon.
Dissolved Oxygen Concentration Values are Important in Many Cases that Require Continuous Control and Monitoring. Without Sufficient DO, Water Sources Become Dirty and Unhealthy, which Will Affect the Quality of the Environment, Drinking Water and Other Products. Monitoring Dissolved Oxygen Levels Helps Improve Efficiency in Aeration Basins. By Using DO Measuring Equipment, a Facility Can Reduce Energy Costs by Adjusting Aeration to Match the Required DO. In Industrial Water Treatment, DO Level Can be an Indicator of Water Quality Issues that Can Lead to Equipment Corrosion. Also, all Aquatic Animals Need Dissolved Oxygen to Breathe. Low Levels of Oxygen (Hypoxia) or Lack of Oxygen (Anoxia) Can Cause Problems for Aquatic Life.
The Actual Concentration of Dissolved Oxygen Depends on Various Factors such as Temperature, Air Pressure, Salinity, Oxygen Consumption by Microorganisms or Oxygen Production by Algae.
In the Table Below, the Variable Values of DO with Temperature Are Included:
Solubility of Oxygen (mg/L)