Hardmetals — Determination of titanium — Photometric peroxide method
The method is applicable to carbide and binder metal powder mixtures, free of lubricant, and all grades of presintered or sintered hardmetals, with a titanium content exceeding 0,2 % (m/m). Specifies principle, interfering elements, reagents, apparatus, sample preparation, procedure, elimination of interferences, preparation of the calibration curve, expression of results and test report.
Metallic powders — Determination of acid insoluble content in iron, copper, tin and bronze powders
The insoluble matter is generally considered to be acid-insoluble silica and silicates, carbides, alumina, and clays. The methods are applicable to lubricant-free powders. ISO 4496 specifies apparatus and reagents, sampling, procedure, expression of results and test report.
Sulphuric acid for industrial use — Determination of arsenic content — Silver diethyldithiocarbamate...
Describes a method applicable to products having aresenic contents equal to or greater than 0,1 mg/kg. As far as principle, the reagents and apparatus to be used are concerned, reference is made to ISO 2590, with some modifications added. For example, the reduction of arsenic by zinc is carried out in sulphuric acid medium. Provides information on the expression of results and the particulars to…
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…