Sodium carbonate for industrial use — Determination of total soluble alkalinity — Titrimetric method
Specifies a titrimetric test method for the determination of the basicity of soluted material. The principle of the procedure consists in solution of a test portion in water, filtration of the solution and titration with a standard volumetric solution of hydrochloric acid in presence of methyl orange as indicator. Repaces ISO Recommendation R 740-1968.
Sodium carbonate for industrial use — Determination of sodium hydrogen carbonate content — Titrimetr...
The method is applicable to sodium carbonate products having a sodium hydrogen carbonate contained in a test portion into sodium carbonate by addition of a known excess of sodium hydroxide, precipitation of all the carbonate by means of barium chloride an determination of the excess of sodium hydroxide by means of a standard volumetric hydrochloric acid solution.
Sodium carbonate for industrial use — Determination of sulphate content — Barium sulphate gravimetri...
The principle in dissolution of a test portion and separation of the insoluble matter. Precipitation of sulphate as barium sulphate in dilute hydrochloric acid medium. Separation of the precipitate obtained and ignition at 800 °C +- 25 °C and weighing. The method is applicable to products having a sodium sulphate content equal to or greater than 0,01 % (m/m). Replaces ISO Recommendation R 743-…
Sodium carbonate for industrial use — Determination of loss of mass and of non-volatile matter at 25...
Describes a method of analysis of anhydrous sodium carbonate and sodium carbonate decahydrate. The principle of analysis consists in heating of thin layers of a test portion to constant mass at 250 °C. The residue constitutes the non-volatile matter at 250 °C. The loss of mass represents water in its various forms plus half the carbon dioxide content of the hydrogen carbonate present. Replaces…
Sodium carbonate for industrial use — Determination of matter insoluble in water at 50 degrees C
The principle of the method consists in dissolution of a test portion and filtration of the solution through a tared filter. Washing of the insoluble matter at approximately 50 C until the washings are no longer alkaline. Drying of the residue and weighing. Replaces ISO Recommendation R 746-1968.
Sodium and potassium silicates for industrial use — Determination of dry matter — Gravimetric method
The principle consists in drying of a test portion in a platinum or silica dish followed by heating to between 600 °C and 650 °C. Weighing of the residue. The maximum deviation between results obtained is 0,6 % (m/m) in absolute value. Replaces ISO Recommendation R 1688-1970.
Sodium and potassium silicates for industrial use — Calculation of the ratio : silicon dioxide/sodiu...
The document specifies the formula for the calculation. In this ratio, only sodium oxide and potassium oxide combined in the form of silicates is considered. Replaces ISO Recommendation R 1689-1970.
Sodium and potassium silicates for industrial use — Determination of silica content — Gravimetric me...
The procedure is based on evaporation to dryness of a test portion previously acidified with hydrochloric acid. Dissolution of the soluble salts, filtration and washing of the insoluble matter. Second evaporation of the filtrate and washings under the same conditions, further dissolution of the soluble salts, filtration and washing. Calcination and weighing of the two lots of insoluble matter…
Sodium and potassium silicates for industrial use — Samples and methods of test — General
The method specified are applicable directly to soluted mateials or materials soluble in boiling water. In case of solid chemicals not readily soluble in boiling water, a special preliminary treatment is necessary. Precautions shall be taken in order to avoid absorption of moisture and carbon dioxide. All tests and analyses shall be carried out at a temperature of 20 °C. In order to avoid…
