Aeration Limitations

The equilibrium solubility of atmospheric oxygen in water is a function of the partial pressure of oxygen, water temperature, and water salinity.  For pure water of a given temperature the DO concentration of air-saturated water is a function of atmospheric pressure and the vapor pressure of water at that temperature.  Dry air contains about 20.95% oxygen by volume producing a partial pressure of oxygen of 0.2095 atmospheres.  This is slightly reduced with the addition of water vapor.  The saturation DO concentration will decrease with increasing temperatures, and will decrease with increasing salinity.