Hardmetals — Determination of cobalt — Potentiometric method
The method is applicable to carbides and binder metal powder mixtures, free of lubricant, all grades of presintered or sintered hardmetals, having a cobalt content exceeding 1 % (m/m). Gives principle, interfering elements, reagents, apparatus, sampling, procedure, expression of results and test report.
Aluminium oxide primarily used for the production of aluminium — Determination of sodium content — F...
The method is applicable to sodium contents equal to or greater than 0.05 % (m/m). The principle of the procedure consists in the fusion, at a controlled temperature, of a test portion with a mixture oflithium carbonate and boron trioxide or a mixture of lithium carbonate and lithium tetraborate. Dissolution of the fused mass in hydrochloric acid. Aspiration of the solution into a flame and…
Aluminium oxide primarily used for the production of aluminium — Determination of vanadium content —...
The method is applicable to products having vanadium contents between 0,0003 % (m/m) and 0,016 % (m/m), provided that the content of chromic oxide and titanic oxide does not exceed 0,002 % (m/m) and 0,006 % (m/m), respectively. The principle consists in a previous oxidation of the vanadium contained in the test sample to vanadium(V) by patassium permanganate in sulphuric acid solution. Formation…
Cryolite, natural and artificial — Determination of silica content — Reduced molybdosilicate spectro...
Specifies methods of test for natural and synthetic materials having a molar ratio sodium fluoride/aluminium trifluoride between 3 and 1,7 approximately. The method is applicable to products the phosphorus pentoxide content of which does not exceed 0,02 % (m/m). The procedure consists in alkaline fusion of a test portion by means of a mixture of sodium carbonate and boric acid. Dissolution of the…
Aluminium oxide primarily used for the production of aluminium — Determination of zinc content — Fla...
The method is applicable to products having Zn contents equal to or greater than 0,002 % (m/m). Dissolution of a test portion by hydrochloric acid under pressure. Aspiration of the solution into an acetylene-air flame and photometric measurement of the absorption of the 213,7 nm line emitted by a hollow-cathode zinc lamp. The dissolution of the sample can also be carried out by an alkaline fusion…
Aluminium oxide primarily used for the production of aluminium — Preparation and storage of test sam...
Specifies the preparation of laboratory samples, crude samples for the determination of certain geometric properties and physical and pysico-chemical tests including the determination of moisture content and dried samples. The principle consists in grinding and sieving of the sample until passing completely through a sieve of meshes having apertures of 0,2 mm. Mixing and drying at about 300 °C.…
Aluminium oxide primarily used for the production of aluminium — Determination of iron content — 1,1...
Applicable to Fe contents, expressed as Fe2 O3 , equal to or more than 0.005 % (m/m). Specifies the preliminary reduction of iron (III) by means of hydroxylammonium chloride. Formation of the iron(II)-1,10-phenanthroline complex in a buffered (pH value between 3.5 and 4.2). Photometric measurement at a wavelength of about 510 nm. Replaces ISO Recommendation R 805/1968.
