Translations:Wasserparameter bei der Wasseraufbereitung/11/en

As the water becomes colder, the amount of O₂ that can be dissolved increases and decreases depending on the salinity or decrease in the atmospheric pressure. Examples:

0 °C, standard pressure, fresh water: 14.6 mg/l = 100% saturation

10 °C, standard pressure, fresh water: 11.3 mg/l = 100% saturation

20 °C, standard pressure, fresh water: 9.1 mg/l = 100% saturation

The following environments can be distinguished depending on the percentage of oxygen in the water:

• Aerobic environment = Presence of dissolved molecular oxygen (O₂) and chemically bound oxygen, > 0.5 mg O₂/l
• Anoxic environment = Presence of a nitrogen bound oxygen (for instance, NO₃- ; NO₂- ), < 0.5 mg O₂/l
• Anaerobic environment = neither dissolved molecule nor nitrogen bound oxygen is present, < 0.5 mg O₂/l