Phthalate esters for industrial use — Methods of test — Part 4: Determination of acidity to phenolph...
The principle consists in titration of the acidity in a test portion, in ethanolic medium, with standard volumetric sodium hydroxide solution using phenolphthalein as indicator. - ISO 1385, Part 1 to Part 5 replace ISO Recommendation R 1385-1970.
Phthalate esters for industrial use — Methods of test — Part 5: Determination of ester content — Tit...
The principle consists in the saponification of ester in a test portion, using a measured excess of potassium hydroxide ethanolic solution, followed by back-titration with standard volumetric hydrochloric acid solution in the presence of phenolphthalein as indicator. - ISO 1385, Part 1 to Part 5 replace ISO Recommendation R 1385-1970
Establishes a set of reference tables for the seven most commonly used types of commercially available thermocouples, giving both electromotive force as a function of temperature and temperature as a function of electromotive force. Gives polynominal expressions from which the reference values can be computed. The reference tables are based on fundamental research and are consistent with the…
Acide phosphorique à usage industriel (y compris les industries alimentaires) — Dosage du calcium — ...
La présente norme spécifie une méthode par absorption atomique dans la flamme pour le dosage du calcium dans l'acide phosphorique à usage industriel (y compris les industries alimentaires).
La méthode est applicable aux produits dont la teneur en calcium est supérieure à 50 mg/kg, mais, en exécutant une courbe d'étalonnage appropriée, on peut étendre le domaine d'application…
Potassium hydroxide for industrial use — Determination of calcium and magnesium contents — Flame ato...
Applicable to products having contents of more than 2.5 mg Ca/kg and 0.5 mg Mg/kg if an acetylene-air flame is used or 0.6 mg Ca/kg and 1.0 mg Mg/kg if an acetylen-dinitrogen monoxide flame is used. The principle consists in the acidification of a test portion with hydrochloric acid, aspiration of the solution into an acetylene-dinitrogen monoxide flame or acetylene-air flame. In the latter case…
Phosphoric acid for industrial use (including foodstuffs) — Determination of calcium content — Flame...
Applicable to products having a Ca content of more than 50 mg/kg. Soluble SiO2 present in the solution at levels lower than 5 g/ml does not interfere. The principle consists in addition, to a hydrochloric acid solution of the test portion, of sodium ions to promote and stabilize the emission of calcium and of lanthanum ions to suppress the interference of aluminium. Specifies the aspiration of…
Paraformaldehyde for industrial use — Methods of test — Part 1: General
Specifies the laboratory sample to have a mass of not less than 500 g. Before carrying out the tests, the sample shall be grind to a fine powder and mixed thoroughly. - ISO 1391, Parts 1 to 4, replace ISO Recommendation R 1391-1970.
Paraformaldehyde for industrial use — Methods of test — Part 2: Determination of ash
The principle of the method is based on burning a test portion and heating at (600 30) °C to constant mass. - ISO 1391, Parts 1 to 4, replace ISO Recommendation R 1391-1970.
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…
