Hexachlorobenzene for industrial use — List of methods of test
Specifies the sampling, the determination of the distillation characteristics subjected to the modifications appropriate for this product, of the water content, of the density at 20 0C and of the crystallizing point. Has also been approved by the IUPAC.
Textiles — Universal system for designating linear density (Tex System)
Gives the principles and recommended units of the Tex System for the expression of linear density and includes conversion tables for calculation the Tex values of numbers or counts in other systems together with a statement of the procedure for the implementation of the Tex System in trade and industry. The Tex System is applicable to all kinds of textile fibres, intermediate products (e.g. tops…
Sodium fluoride for industrial use — Determination of water-insoluble matter
The principle consists in dissolution of a test portion, separation of all insoluble matter by filtration of the solution by vacuum through a filter crucible, drying and weighing. Has also been approved by the IUPAC.
Sodium fluoride for industrial use — Determination of moisture content
Describes a gravimetric method of analysis. It consists in drying a test portion in an electric oven ventilated by convection at (110 2) 0C. Calculation of the moisture content by the loss of mass. Has also been approved by the IUPAC.
Sodium fluoride for industrial use — Determination of fluorine content — Modified Willard-Winter met...
The principle consists in separation of the fluorine from a test portion by distillation with sulphuric acid or perchloric acid. Titration with thorium nitrate solution using sodium alizarinsuphonate and methylene blue as indicators. Alternatively the thorium nitrate titration may be carried out using sodium alizarinsuphonate alone as indicator, the end-point being determined…
Acetaldehyde for industrial use — Determination of total content of carbonyl compounds — Volumetric ...
Volumetric method of the determination of carbonyl compounds present by reaction with hydroxylammonium chloride and titration with standard volumetric sodium hydoxide solution in the presence of bromophenol blue as indicator. Has also been approved by the IUPAC.
Acetaldehyde for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric m...
The principle consists in the evaporation to dryness of a test portion and dissolution of the residue in hydrochloric acid. Reduction of iron(III) by means of hydroxylammonium chloride. Formation of the iron(II)- 2,2'-dipyridyl complex. Photometric measurement of the coloured complex at a wavelength of about 522 nm. Specifies the use of a spectrophotometer or photoelectric absorptionmeter.…
