Sodium carbonate for industrial use — Determination of chloride content — Mercurimetric method
The method is applicable to products of which the sodium chloride content is greater than 0,005 % (m/m). The prinziple consists in titration of the chloride ion with mercury(II) nitrate solution in the presence of diphenylcarbazone as indicator. Cancels and replaces ISO Recommendation R 742-1968.
Method of measurement of non-linearity in resistors
Standardizes a method of measurement and associated test conditions for determining the magnitude of non-linear distortion generated in a resistor. Has the status of a technical report.
The contents of the corrigendum of September 1974 have been included in this copy.
Sodium chloride for industrial use — Determination of the loss of mass at 110 degrees C
Specifies a method for the determination of the conventional moisture content. The principle consists drying of a test portion in an oven at (110 +- 2) °C to constant mass.
Sodium chloride for industrial use — Determination of sulphate content — Barium sulphate gravimetric...
The method is applicable to water soluble sulphate, in the product, but also to sulphates in a principal solution prepared in an acid medium. The principle consists in dissolution of a test portion and separation of the insoluble residue. Precipitation of the sulphate ions by barium chloride in a boiling acid medium. Filtration, washing and ignition of the precipitate. Weighing of the residue.
Cryolite (natural and artificial) — Determination of aluminium content — 8- Hydroxyquinoline gravime...
The method can be applied provided the Fe203 content does not exceed 0,15 . It can also be applied to products with molar ratio of NaF to AlF3 between approximately 3 and 1,7. The principle consists in dissolution of a test portion by acid fusion using potassium pyrosulphate and recovery by hydrochloric acid. Separation of the mixture by precipitation of aluminium, with ammonium benzoate , in an…
Aluminium fluoride for industrial use — Determination of iron content — 1,10- Phenanthroline photome...
The method is applicable to products having a content greater than 0,020 %. The principle consists in dissolution of a test portion by either alkaline or acid fusion. Reduction of the iron(III) by hydroxylammonium chloride. Formation of the iro(II)-1, 10-phenanthroline complex in a buffered medium (pH value between 3,5 and 4,2) Photometric measurement of the coloured complex at a wavelength of…
Aluminium fluoride for industrial use — Determination of silica content — Spectrophotometric method ...
The method can be applied provided the phosphorus pentoxide content does not exceed 0,02 % (m/m). The principle is based on alkaline fusion of a test portion by means of a mixture of sodium carbonate and boric acid. Solution of the fused mass in excess nitric acid so that the pH of the final solution is between 0,3 and 0,5 after being diluted. Formation, in a suitable aliquot portion, of the (…
