Sodium hexafluorosilicate for industrial use — Determination of phosphate content — Molybdovanadate ...
Applicable to products having contents, expressed as phosphorus pentoxide, of 0.005 % (m/m) to 0.05 % (m/m). The residue from the determination of the loss of mass according to ISO 5444 is used to prepare the test sample. Dissolution in dilute hydrochloric acid and nitric acid solutions. Formation of the yellow molybdovanadate and spectrophotometric measurement at a wavelength of about 420 nm.…
Wrought copper and copper alloys — Detection of residual stress — Mercury(I) nitrate test
Specifies an accelerated test for the purpose of detecting the presence of residual (internal) stresses in wrought copper and copper alloy products that might bring about failure of the material in service or storage through stress corrosion cracking. The method is not intended for testing assemblies and partial assemblies. For such use some modifications may be required.
Soaps — Determination of moisture and volatile matter content — Oven method
A sample of about 10 g is weighed to the nearest 0.01 g, placed in an oven controlled at 103 2 °C, cooled in a desiccator and weighed again. The operations are repeated until the difference in mass between two successive weighings is less than 0.01 g.
The tests are carried out at room temperature, in air, by applying to the test piece a pure couple about its longitudinal axid. Test piece diameters are between 5 mm and 12,5 mm. The proparation, form and testing of test pieces of circular cross-section are specified. Does not specify component testing and high strain torsional fatigue tests, which lead to failure in a few thousand cycles.
Urea for industrial use — Determination of biuret content — Flame atomic absorption and photometric ...
Applicable to products having contents of equal to or more than 0.05 % (m/m) (with flame atomic absorption) or 0.1 % (m/m) (with fotometric absorption). Covers the formation of a complex between biuret and copper(II) sulphate in alkaline medium. Fixation of this complex on an anion exchange resin. Elution of Cu first with a potassium nitrate solution and then with a nitric acid solution. Flame…
Aluminium oxide primarily used for the production of aluminium — Determination of titanium content —...
Applicable to all products having a titanium dioxide content of equal to or more than 0.001 % (m/m). Describes the preparation of the diantipyrylmethane solution and the preparation of the titanum standard solution. The procedure of the preparation of a principal solution or the chemical analysis by an alkaline fusion is carried out according to ISO 804 replacing the nitric acid solution by the…
Maleic anhydride for industrial use — Methods of test — Part 6: Determination of iron content — 2,2&...
The principle is based on the dissolution, in hot hydrochloric acid, of the residue from the determination of the ash of a test portion (see ISO 1390/5). Reduction, by hydroxylammonium chloride, of the iron(III) contained in the solution thus obtained, formation of the coloured complex iron(II)-2,2'bipyridyl in a buffered medium. Photometric measurement of the coloured complex at a…
Phthalic anhydride for industrial use — Methods of test — Part 11: Determination of iron content — 2...
The principle is based on the dissolution, in hot hydrochloric acid, of the residue from the determination of the ash of a test portion (see ISO 1389/8). Reduction, by hydroxylammonium chloride, of the iron(III) contained in the solution thus obtained, formation of the coloured complex iron(II)-2,2'bipyridyl in a buffered medium. Photometric measurement of the coloured complex at a…
Determination of crystallizing point — General method
The method is applicable in the range from about -50 °C to about +250 °C. the determination can be carried out directly on the sample as received, or on the dried sample, or on both. In which of these conditions the sample is to be tested will be stated in the specific test method for each material. The principle is based on cooling the liquid or liquefied sample and observation of the…
Paraformaldehyde for industrial use — Methods of test — Part 3: Determination of iron content — 2,2&...
Conversion of iron contained in a test sample to sulphate by treatment with hot sulphuric acid. Oxidation of the iron present in the solution by hydrogen peroxide and subsequently reduction of the iron(III) by hydroxylammonium chloride. Formation of the coloured complex iron(II)-2,2'bipyridyl in a buffered medium. Photometric measurement of the coloured complex at a wavelength of about 510…
