Reference number
ISO 3423:1975
ISO 3423:1975
© ISO 2024
International Standard
ISO 3423:1975
Sulphuric acid and oleums for industrial use — Determination of sulphur dioxide content — Iodometric method
Edition 1
1975-11
1975-11
ISO 3423:1975
8739
Publicado
(Edición 1, 1975)
Esta publicación se revisó y confirmó por última vez en 2019.
Por lo tanto, esta versión es la actual.
Resumen
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.