This part of the standard specifies an iodometric method for the determination of dissolved oxygen in water by the so-called ""Winkler procedure"" modified in order to make allowance for certain interferences.
DS/EN 25813:2003 history
2003DS/EN 25813:2003 Water quality - Determination of dissolved oxygen - Iodometric method
1993DS/EN 25813:1993 Water quality. Determination of dissolved oxygen. Iodometric method