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Did you know... the salinity of the medium has an impact on your DO measurement?

Did you know... the salinity of the medium has an impact on your DO measurement?

Yes, it does!

The solubility of oxygen in water depends on the total concentration of dissolved solids in the water. This can be expressed as salinity in g/kg. For example, sea water has a salinity of approx. 35 g/kg.

In pure water, at 25°C and 1 bar, the oxygen saturation (max. amount of oxygen that can be dissolved in water) is 8.95 mg/l. For water with a salinity of 5 g/kg, the saturation is only 7.80 mg/l. For sea water that would be 6.60 mg/l.

You can conclude that, if you are not measuring in pure water, salinity compensation for your dissolved oxygen measurement is important.

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