Hydrochloric acid for industrial use — Determination of arsenic content — Silver diethyldithiocarbam...
Describes a method applicable to products having arsenic contents equal to or greater than 0,2 mg/kg. As far as principle, reagents and apparatus to be used are concerned, reference is amde to ISO 2590. Provides information on the expression of results and the particular to be included in the test report. The annex lists ISO publications covering the same subject.
Ammonium sulphate for industrial use — Determination of arsenic content — Silver diethyldithiocarbam...
Describes a method applicable to products having arsenic contents euqal to or greater than 0,1 mg/kg. The principle consists in dissolving a test portion, acidifying it with hydrochloric acid solution and applying the general method as described in ISO 2590. Provides information on the expression of results and the particulars to be included in the test report. The annex lists ISO publications…
Surface active agents — Technical alkane sulphonates — Determination of total alkane sulphonates con...
A test portion is dispersed in a sodium sulphate solution, and mixture of butan-l-ol and acetons is added to precipitate sodium sulphate decahydrate and part of sodium chloride. A mixture of alkane sulphonates (mono + di), which may be contiminated by a little sodium chloride is obtained by filtration. The solvent is evaporated so that the small quantities of paraffins are eliminated. The alkane…
Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Titrimetr...
The found value only includes free amino acids, compounds producing amino acids on hydrolysis and ammonium compounds. The principle consists in destruction of organic matter by sulphuric acid in the presence of a compound catalyst (see ISO 1871), alkalization of the reaction products, distillation of the liberated ammonia and collection in a boric acid solution, followed by titration with a…
Corrigendum 1 - Determination of the aromatic hydrocarbon content of new mineral insulating oils
Applies to quality control and acceptance testing of oils. Two methods of analysis are given: infra-red spectrophotometry and adsorption chromatography.
Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Spectroph...
Destruction of organic matter by sulphuric acid in the presence of a compound catalyst (see ISO 1871), alkalization of the reaction products, destillation of the liberated ammonia and collection in a sulphuric acid solution, followed by measuring of the ammonium salt formed after the addition of Nessler reagent. The method is provided for contents less than 0,025 % (m/m). For greater contents,…
Hardmetals — Determination of contents of metallic elements by X-ray fluorescence — Solution method
The solution method determines cobalt, iron, manganese, molybdenum, nickel, niobium, tantalum, titanium, tungsten, vanadium and zirconium. Is applicable to carbides of niobium, tantalum, titanium, vanadium, tungsten and zirconium, mixtures of these carbides and binder metals, all grades of presintered or sintered hardmetals, produce from these carbides, with the minimum element contents shown in…
