Oxygen

Parameter-Dissolved_Oxygen_B1_600x338px_DE.jpgDissolved 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.

Sensors for lab and field

Sensors for lab and field

To measure oxygen in lab and field 

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Benchtop meters

Benchtop meters

To measure oxygen in lab – radio connection available 

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Portable meters

Portable meters

To measure oxygen in the field – radio connection available 

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photoLab<sup>®</sup> 7100 VIS

photoLab® 7100 VIS

Spectral photometer to measure oxygen in the lab 

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Optical sensors for wastewater

Optical sensors for wastewater

To monitor e.g. nitrification on a wastewater treatment plant – calibration free 

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Electrochemical sensors for wastewater

Electrochemical sensors for wastewater

To monitor e.g. nitrification on a wastewater treatment plant 

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Oxygen in drinking water

Oxygen in drinking water

Analog systems for drinking water monitoring 

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Titrator TitroLine<sup>®</sup> 7000

Titrator TitroLine® 7000

To titrate oxygen according to WINKLER 

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