Sodium fluoride primarily used for the production of aluminium — Determination of soluble sulphates ...
Applicable to products having SO4 contents of more than 0.05 % (m/m). Covers the dissolution of the test portion in hydrochloric acid and evaporation in hydrochloric acid solution for drying. Dissolution of the residue in a hydrochloric acid solution. Measurement of the turbidity obtained by precipitation, under specified conditions, of barium sulphate using a spectrophotometer at a wavelength of…
Sodium and potassium silicates for industrial use — Determination of carbonates content — Gas-volume...
Three cases, defined by a preliminary test, are envisaged: silicates containing neither sulphides nor chlorates; silicates containing sulphides; silicates containing chlorates. The method based on boiling of an acidified test portion containing methyl orange and with a lead paper strip in the vapour. The presence of sulphides produces blackening of the paper and the presence of chlorates…
Sodium fluoride primarily used for the production of aluminium — Determination of iron content — 1,1...
Applicable to the determination of Fe contents, expressed as Fe2 O3 , of more than 0.020 % (m/m). Covers the dissolution of a test portion by alkaline fusion by means of sodium carbonate and boric acid. Dissolving of the residue with nitric acid solution and reduction of iron(III) by means of hydroxylammonium chloride. Formation of the iron(II)-1,10-phenanthroline complex in a buffered medium at…
Aluminium alloys — Determination of zinc — EDTA titrimetric method
The method is applicable to alloys not containing cadmium and having zinc contents between 0,10 and 12,0 % (m/m). Specifies principle and procedure of the method, the reagents, apparatus, sampling, expression of results and test report.
Anhydrous hydrogen fluoride for industrial use — Determination of hexafluorosilicic acid content — R...
Applicable to products having H2 SiF6 contents between 0.01 % (m/m) and 0.2 % (m/m). Gives introductory instructions to the risk in handling with the product. The principle of analysis consists in formation of oxidized molybdosilicate (yellow) in weakly acid medium in the presence of boric acid to suppress interference by fluorine. Selective reduction of this complex after addition of sulphuric…
Anhydrous hydrogen fluoride for industrial use — Determination of sulphur dioxide content — Iodometr...
Applicable to products having SO2 contents between 0.002 % (m/m) and 0.20 % (m/m). The principle consists in addition of a measured volume of iodine solution to a test portion. Back-titration of the excess iodine using a standard volumetric sodium thiosulphate solution and calculation of the SO2 content from the amount of iodine used.
Potassium hydroxide for industrial use — Determination of calcium content — EDTA (disodium salt) co...
The method is applicable to products having a calcium content equal to or greater than 0.002 % (m/m). The principle consists in titration of the calcium with a standard volumetric solution of the disodium salt of (ethylenedinitrilo)tetraacetic acid (EDTA disodium salt) in the presence of 2,2'-(ethylenedinitrilo)diphenol Äglyoxal-bis-(2-hydroxyanil)Ü as indicator, after elimination of…
Sodium hydroxide for industrial use — Determination of calcium content — EDTA (disodium salt) compl...
The method is applicable to products having a calcium content equal to or greater than 0.002 % (m/m). The principle consists in titration of the calcium with a standard volumetric solution of the disodium salt of (ethylenedinitrilo)tetraacetic acid (EDTA disodium salt) in the presence of 2,2'-(ethylenedinitrilo)diphenol Äglyoxal-bis-(2-hydroxyanil)Ü as indicator, after elimination of…
The method is applicable to alloys having insoluble zirconium contents between 0,02 and 0,3 %. Rare earths, thorium and silver do not interfere. Specifies principle and procedure of the method, reagents, apparatus, sampling, expression of results and test report.
