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