Chemical oxygen demand, CODMn

Last changed: 01 April 2019

Known issues in the database

Since January 2019 are the results reported as CODMn i.e. in the unit mg O/l.

Until December 2018 was only the amount of oxidant used (permanganattal) is given in our database. A conversion between the amount and CODMn is done according to:

Amount of oxidant used (permanganattal) = 3.95 * CODMn

Current method of measurement

Valid since March 2008
Method: Fd. SS 02 81 18, utg1, mod
Instruments: Metrohm Titrator Titrino 785
Note: Water samples conserved with H2SO4. Until December 2018 were the results reported as amount of oxidant (permanganattal). Since January 2019 are the results reported as CODMn i.e. in the unit mg O/l.

Previous methods

1981 01 - 2008 02

Method:SS 28118-1 mod. - Vattenundersökningar - Bestämning av oxygenförbrukning hos vatten - CODMn oxidation med permanganat (the same method as for the period 1968-1980, but it was turned into a Swedish standard 1981-05-20).
Instruments: Metrohm Titrator Dosimat 665
Note: Water samples conserved with HgCl2 until 1996. From 1997 were the water samples conserved with H2SO4.

1968 01 - 1980 12
Method: Scandinavian Pulp, Paper and Board Testing Committee Scan-W1:66. Bouveng, H-O. & Olsson, E. Permanganate value of waters: a modified procedure, Skogsindustriernas Vattenlaboratorium, Stockholm, Sweden.
Note: Water samples conserved with HgCl2.

1965 01 - 1967 12
Method: Deutsche Einheitsverfahren 3nr Wasser, Abwasser und Schlammuntersuchung, Verlag Chemie, Gmbtt Weinheim 1960.
Note: Water samples conserved with HgCl2.


Contact
Page editor: Lars.Sonesten@slu.se