Dissolved oxygen, O2

Measurements are made according to the Winkler method (reduction of O₂ by Mn(II) followed by iodometric quantification of oxidised Mn). The endpoint is determined potentiometrically.

Known issues in the databases

Current method of measurement

Valid since March 2008
Method: Karlgren, L. 1961, Vattenkemiska analysmetoder (Hydrochemical Analytical Methods, In Swedish). Instruments: Metrohm Titrator Titrino 785 DMP. Metrohm electrode 6.0451.100, Pt/5-80 degrees.

Previous methods

1987-08 – 2008-02
Method: Karlgren, L. 1961, Vattenkemiska analysmetoder (Hydrochemical Analytical Methods, In Swedish).
Instrument: Metrohm Titrator Dosimat 665.

1965-01 – 1987-07
Method: Karlgren, L. 1961, Vattenkemiska analysmetoder (Hydrochemical Analytical Methods, In Swedish).