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ISO 3196:1975

Sodium hydroxide for industrial use -- Determination of carbonates content -- Titrimetric method
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ISO 3196:1975

Sodium hydroxide for industrial use -- Determination of carbonates content -- Titrimetric method

PUBLISH DATE 1975
ISO 3196:1975

Applicable to products having contents, expressed as CO2, of more than 0.01 % (m/m).

Relates to a product containing neither sulphides nor chlorates or only sulphides or only chlorates.

Preliminary test by boiling an acidified test sample in the presence of methyl orange and with a lead acetate paper strip in the vapour.

  • The sulphides blacken the paper.
  • Chlorates decolourize the methyl orange.

Products containing neither sulphides nor chlorates: liberation of carbon dioxide by acidification and heating.

Entrainment in a flow of gas and absorption in an excess of barium hydroxide solution.

Titration of the excess barium hydroxide solution with a standard volumetric hydrochloric acid solution in the presence of thymolphthalein as indicator.

SDO ISO: International Organization for Standardization
Document Number ISO 3196
Publication Date May 1, 1975
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 47
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