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.
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 halogens, expressed as chlorine — Mercurimetri...
The principle of the analysis consists in titration of the halogen ions with mercury(II) nitrate in the presence of diphenylcarbazone as indicator. The main solution for the determination is prepared according to ISO 2479.
High-voltage alternating current switch-fuse combinations and fuse-circuit-breaker combinations
This standard applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches including switch-disconnectors and current-limiting fuses and thus able to interrupt:
- any load current up to the rated breaking current of the switch;
- any over-current up to the rated short-circuit breaking current of the combination…
Voltage bands for electrical installations of buildings
Applies to a.c. electrical installations of buildings supplied at a frequency not exceeding 60 Hz and at a nominal voltage up to and including 1 000 V. Defines two voltage bands: Band I covers the installations where protection against shock is provided under certain conditions by the value of voltage and the installations where the voltage is limited for operational reasons (e.g.…
Sodium chloride for industrial use — Determination of matter insoluble in water or in acid and prepa...
Insoluble substances shall be defined by the conditions described in this document. The object is not to dissolve all the impurities but only those of interest to users. The method is applicable to the analysis, carried out inaqueous medium or in acid medium. The principle consists in solution of the test portion in water, filtration, drying and weighing of the insoluble residue. Dilution of the…
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.
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 (…
