What is Dissolved Oxygen Saturation?

Document ID

Document ID TE2857

Version

Version 2.0

Status

Status Published

Published Date

Published Date 27/05/2017
Question
What is Dissolved Oxygen Saturation?
Summary
Dissolved Oxygen Saturation
Answer
In a stable body of water with no stratification, dissolved oxygen will remain at 100% air saturation. 100% air saturation means that the water is holding as many dissolved gas molecules at it can in equilibrium. At equilibrium, the percentage of each gas in the water would be equivalent to the percentage of that gas in the atmosphere, which is known as its partial pressure. The water will slowly absorb oxygen and other gasses from the atmosphere until it reaches equilibrium at complete saturation. This process is sped up by aeration. It is possible for dissolved oxygen to exceed 100% air saturation in water by biological means.