English Search Home Parameters Dissolved Oxygen (D.O.) Oxygen 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. Sensors for lab and field To measure oxygen in lab and field View products Benchtop meters To measure oxygen in lab – radio connection available View products Portable meters To measure oxygen in the field – radio connection available View products photoLab® 7100 VIS Spectral photometer to measure oxygen in the lab View product Optical sensors for wastewater To monitor e.g. nitrification on a wastewater treatment plant – calibration free View products Electrochemical sensors for wastewater To monitor e.g. nitrification on a wastewater treatment plant View products Oxygen in drinking water Analog systems for drinking water monitoring View products Titrator TitroLine® 7000 To titrate oxygen according to WINKLER View product Contact Us If you have any questions don't hesitate to get in touch Contact us Related Information Nitrate / Nitrite / NOxConductivitySurface water About us about Xylem Analytics Xylem Sustainability Xylem Watermark Transparency in Supply Chain Our Brands Aanderaa Bellingham + Stanley Ebro Global Water MJK OI Analytical SI Analytics SonTek WTW YSI All Xylem Brands Customer Support Downloads Calibration Repair Certification Contact Us Contact WTW Contact SI Analytics Contact Bellingham + Stanley Connect With Us © 2021 Xylem Analytics Germany Sales GmbH & Co. KG. All names are registered tradenames or trademarks of Xylem Inc. or one of its subsidiaries. Privacy Policy Terms and Conditions ElektroG/WEEE Imprint STEP 1 OF 2 Privacy By providing personal data to Xylem, you acknowledge that you have read and understand the terms of our Website Privacy Statement Accept Why am I seeing this? English Dansk Magyarország Россия Nederland Français Polski Svenska Español Italiano Deutsch Norsk Suomi Português slovenčina 中文 日本語