ISO 2900:1973
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Potassium hydroxide for industrial use — Determination of carbon dioxide content — Titrimetric method
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05-10-2019
English, French
08-01-1973
Applicable to products having CO2 contents of more than 0.01 % (m/m). Three cases are envisaged. The product containing neither sulphides nor chlorates or containing sulphides or chlorates. The principle in presence of neither sulphides nor chlorates consists in liberation of carbon dioxide in a flow of gas and absorption in an excess of standard volumetric barium hydroxide solution. Titration of the excess with standard volumetric hydrochloric acid solution in the presence of thymolphthalein as indicator. In presence of sulphides, pretreatment by oxidation of the sulphides by hydrogen peroxide and boiling, in presence of chlorates, pretreatment by reduction of the chlorates to chlorides by the addition of iron(II) sulphate.
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