ISO 3423:1975

Current Revision
Sulphuric acid and oleums for industrial use -- Determination of sulphur dioxide content -- Iodometric method

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ISO 3423:1975

Sulphuric acid and oleums for industrial use -- Determination of sulphur dioxide content -- Iodometric method

PUBLISH DATE 1975
ISO 3423:1975

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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