RS ISO 5813: 1983
Water quality — Determination of dissolved oxygen — Iodometric method


This International 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.
The iodometric method is the reference method for the determination
of dissolved Oxygen in water. lt is applicable to all
types of water having dissolved Oxygen concentrations greater
than 02 mg/l, up to double Saturation of Oxygen (approximately
20 mg/l), which are free from intet-fering substances.
Readily oxidizable organic substances such as tannins, humic
acid and lignins, interfere. Oxidizable sulphur compounds such
as sulphides and thiourea also interfere, as do actively respiring
Systems which readily consume Oxygen. In the presence of
such substances, it is preferable to use the electrochemical
probe method specified in ISO 5814.

General Information

RS ISO 5813: 1983ADOPTED ISO STANDARDSEnvironment. Health protection. Safety9First Edition
Jun 2019
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