Oxygen Saturation Concentration

The amount of oxygen that can be dissolved in water is a function of temperature, concentration of dissolved solids, and atmospheric pressure. An equation developed by APHA (1985) is used to calculate the saturation concentration of dissolved oxygen:

$Ox_{sat}=exp[-139.34410+\frac{1.575701*10^5}{T_{wat,K}}-\frac{6.642308*10^7}{T_{wat,K}^2}+\frac{1.243800*10^{10}}{T_{wat,K}^3}-\frac{8.621949*10^{11}}{T_{wat,K}^4}]$ 7:3.5.3

where $Ox_{sat}$ is the equilibrium saturation oxygen concentration at 1.00 atm (mg O$_2$/L), and $T_{wat,K}$ is the water temperature in Kelvin (273.15+$\degree$C).