Sodium hydrogen carbonate for industrial use — Determination of moisture content — Gravimetric metho...
The method is applicable to products having a content greater than 0,1 % (m/m). The principle consists heating the test protion, distributed in a thin layer, at 250 °C to constant mass. The water and of carbon dioxide, corresponding to the decomposition of sodium hydrogen carbonate into sodium carbonate.
Boric acid for industrial use — Determination of boric acid content — Volumetric method
The method is based on titration of a dissolved test portion with a standard volumetric solution of sodium hydroxide in the presence of mannitol or sorbitol, using phenolphthalein as indicator. Water free from carbon dioxide, shall be used in the test .
Boric oxide for industrial use — Determination of boric oxide content — Volumetric method
The method is based on titration of dissolved test portion with a standard volumetric solution of sodium hydroxide in the presence of mannitol or sorbitol, using phenolphthalein as indicator. Water, free from carbon dioxide, shall be used in the test.
Disodium tetraborates for industrial use — Determination of sodium oxide and boric oxide contents an...
The principle of the method consists in determination of the sodium oxide content by addition of an excess of a solution of hydrochloric acid and back titration with a standard volumetric solution of sodium hydroxide in presence of methyl red/bromocresol green as indicator. In the same solution, titration of the boric oxide with standard volumetric solution of sodium hydroxide in the presence of…
Hydrated sodium perborates for industrial use — Determination of sodium oxide, boric oxide and avail...
Determination of the sodium oxide content by addition of an excess of a solution of hydrochloric acid and back titration with a standard volumetric solution of sodium hydroxide in presence of methyl red/bromocresol green as indicator. Subsequent titration of the boric oxide with the standard volumetric solution of sodium hydroxide in the presence of mannitol or sorbitol, using phenolphthalein as…
