Dissolved oxygen is present in virtually every liquid. Liquid dissolves oxygen until the partial pressure of oxygen in the liquid is in equilibrium with the air or gas in which it is in contact. The actual concentration of dissolved oxygen depends on a number of factors, such as temperature, air pressure, oxygen consumption by microorganisms in a biodegradation process or oxygen production by algae.
For example, at a temperature of 20°C (68°F) and an atmospheric pressure of 1013 mbar, saturated water contains about 9 mg/l oxygen. Ethanol can contain up to 40 mg/l, whereas glycerol only has about 2 mg/l. In all three cases the measured oxygen saturation is 100%. The oxygen concentration is important e.g. for the living conditions in waters or the degradation processes in wastewater treatment.
The determination of the oxygen concentration was formerly carried out by the Winkler titration method. Today, electrochemical and optical measurements are recognized methods in numerous standard procedures.
To measure oxygen in lab and field
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To measure oxygen in lab – radio connection available
To measure oxygen in the field – radio connection available
Spectral photometer to measure oxygen in the lab
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To monitor e.g. nitrification on a wastewater treatment plant – calibration free
To monitor e.g. nitrification on a wastewater treatment plant
Analog systems for drinking water monitoring
To titrate oxygen according to WINKLER
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