Milk and milk products — Determination of iron content — Spectrometric method (Reference method)
Is applicable to milk, skimmed milk, whey, buttermilk, plain and skimmed yogurt, evaporated milk, sweetened condensed milk, dried whole and skimmed milk, dried whey and dried buttermilk, cream and butter, butterfat, ice-cream, cheese of various ages and processed cheese, caseins, caseinates and coprecipitates. The principle of determination consists in digesting the organic material with a…
Solid timber in structural sizes — Determination of some physical and mechanical properties
Laboratory methods are specified for determining the modulus of elasticity in static bending, shear modulus, bending strength, modulus of elasticity in tension, tension strength parallel to the grain, modulus of elasticity in compression, compression strength parallel to the grain and dimensions, moisture content, and density. The methods apply to rectangular and square sections of solid…
Aluminium ores — Determination of total silicon content — Combined gravimetric and spectrophotometri...
The method is applicable to ores containing between 1 and 25 % (m/m) silicon dioxide. Specifies principle, reagents, apparatus, sampling and preparation of samples, procedure, expression of results and test report.
Aluminium ores — Determination of iron content — Titrimetric method
The method ist applicable to ores containing between 2 and 50 % (m/m) iron oxide. The method has been chosen to avoid interference from platinum which may occur with the use of platinum crucibles. Specifies principle, reagents, apparatus, sampling and preparation of samples, procedure, expression of results and test report.
Liquefied anhydrous ammonia for industrial use — Determination of oil content — Gravimetric and infr...
A test portion is evaporated at ambient temperature and the oil contained in the residue is extracted with carbon tetrachloride. The oil contained in the residue is determined either gravimetrically by evaporation of the organic solvent and weighing of the residue or by spectrometric measurement of the absorbance of the organic phase at a wavelength of approximately 3.42 m. The gravimetric method…
Carbonaceous materials for the production of aluminium — Calcined coke — Determination of apparent o...
A test portion is heated in a non-oxidizing atmosphere at a fixed temperature and the loss of mass is determined. The apparent oil content is calculated in terms of loss of mass. To ensure a non-oxidizing atmosphere, some drops of toluene are added to the crucibles.
Cheese and processed cheese — Determination of total solids content (Reference method)
Specifies a method, the principle of which consists in evaporatiing the water from a test portion in the presence of sand at a temperature of 102 +/- 2 degrees centigrade in a drying oven. The content determined is expressed as a percentage by mass.
Ammonia solution for industrial use — Determination of ammonia content — Titrimetric method
A test portion is introduced into a solution of boric acid and the solution obtained is titrated with a standard volumetric solution of sulfuric acid in the presence of methyl red as indicator. The method is applicable to solutions containing not more than 35 % (m/m) of ammonia.
Liquefied anhydrous ammonia for industrial use — Determination of water content — Karl Fischer metho...
A test portion is evaporated in the presence of ethanediol and the water content of the residue is determined by the Karl Fischer method with direct electrometric measurement. The method is applicable to products having water contents equal to or greater than 50 mg/kg. For water contents greater than 1000 mg/kg it is preferable to dilute the evaporation residue with anhydrous methanol in…
