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For an updated and comprehensive look at DO and the technology used to measure it, check out: Dissolved Oxygen, or Measuring Dissolved Oxygen. Dissolved oxygen in water is vital for underwater life. It is what aquatic creatures need to breathe. Dissolved oxygen is often called DO for short.
Oxygen is the most abundant element on earth. Oxygen exists as O 2 and O 3 (ozone), and is present in a number of compounds including water molecules. It can be found dissolved in water as O 2 molecules. Consequently, the oxygen content of seawater is 85.7%.olubility of oxygen and oxygen compounds. Water solubility of oxygen at 25 o C and pressure = 1 bar is at 40 mg/L water. In air with a normal composition the oxygen partial pressure is 0.2 atm. This results in dissolution of 40.