Apparent oxygen utilisation
In freshwater or marine systems apparent oxygen utilization (AOU) is the difference between oxygen gas solubility (i.e. the concentration at saturation) and the measured oxygen concentration in water with the same physical and chemical properties.
![{\displaystyle AOU=[O_{2}\ solubility]-[O_{2}\ observed]}](../I/4edd89bc2f8cae8f9161026d26198ad2550a9fd4.svg)
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