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download between 0-24 hoursReleased: 1975
ISO 3423:1975
ISO 3423:1975-Sulphuric acid and oleums for industrial use — Determination of sulphur dioxide content — Iodometric method
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| Standard´s number: | ISO 3423:1975 |
| Pages: | 3 |
| Edition: | 1 |
| Released: | 1975 |
DESCRIPTION
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.