ISO 3423:1975
International Standard
Current Edition
·
Approved on
01 November 1975
Sulphuric acid and oleums for industrial use — Determination of sulphur dioxide content — Iodometric method
ISO 3423:1975 Files
English
3 Pages
Current Edition
20.51 OMR
ISO 3423:1975 Scope
Applicable of products the SO2 content of which is equal to or more than 2 mg/kg. Based on the displacement of the sulphur dioxide present in the test portion by a current of pure nitrogen and absorption in a known volume of iodine solution. Titration of the excess of iodine with standard volumetric sodium thiosulphate solution. The diagram of the glass apparatus for absorption is shown in a figure.
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