Aluminium oxide primarily used for the production of aluminium — Determination of fluorine content —...
Applicable to products having F contents of more than 0.003 % (m/m). Dissolution of a test portion by attack by sulphuric acid under pressure. Separation of the fluorine by distillation at a temperature of (150 1) °C by sulphuric acid. The distillation is carried out by the method described in ISO 1693. Formation of a blue coloured complex between fluorine and alizarin complexone/lanthanum…
Aluminium oxide primarily used for the production of aluminium — Determination of phosphorus content...
Applicable to products having phosphorus contents of more than 0.0005 % (m/m). Preparation of a solution from a test portion by alkaline fusion either with a mixture of sodium carbonate and borid or of sodium carbonate and sodium tetraborate. Dissolution of the cooled molten mass in nitric acid and adjustment of an appropriate aliquot portion to pH 2. Formation of a phosphomolybdic complex and…
Cryolite, natural and artificial — Determination of aluminium content — Atomic absorption method
Applicable to products having a normal composition for which the molar ratio NaF/AlF3 is equal to about 3. Dissolution of a test portion in concentrated suphuric acid and elimination of hydrogen fluoride. Treatment with hydrochloric acid and water. Atomization of the solution into an acetylene measurement of the absorption of the 309.3 nm line emitted by an aluminium hollow cathode lamp. Has also…
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.…
Magnesium alloys — Determination of zinc — Volumetric method
The method is applicable to alloys not containing cadmium and having zinc contents between 0,10 and 8,0 % (m/m). Specifies principle and procedure of the method, the reagents, apparatus, sampling, expression of results and test report.
Aluminium and aluminium alloys — Determination of silicon — Gravimetric method
The method is applicable to the determination of silicon content greater than or equal to 0,30 % in aluminium and aluminium alloys. The method is not completely applicable to alloys containing silicon or magnesium (see annex A) and tin or antimony respectively (see annex B), for which it should be modified.
Magnesium alloys — Determination of aluminium — 8-hydroxyquinoline gravimetric method
The method is applicable to the determination of aluminium content between 1,5 and 12,0 % in magnesium alloys other than those containing zirconium, thorium or rare earths.
