Carbonaceous materials for the production of aluminium — Pitch for electrodes — Determination of con...
Specifies a gravimetric method, the principle of which consists in weighing the fraction of a test portion of pitch which is insoluble in toluene after boiling for a specified period.
The Standard specifies certain characteristics of the oil. The oil shall be clear and almost colourless to pale yellow, the odour characteristic, recalling cineole. The relative density at 20/20 °C has to ly between 0,906 and 0,925 and the refractive index at 20 °C between 1,4590 and 1,4670. The optical rotation shall range from 0 to + 10 . 1 volume of the oil shall not require more than 5…
Maize — Determination of moisture content (on milled grains and on whole grains)
A section one specifies the reference method. It consists in grinding of sample, if necessery, after pre-conditioning, if required, then drying of a test portion at a temperature between 130 and 133 C under conditions which enable a result to be obtained which is in agreement with that obtained by the absolute method ( prescribed in an annex). A section two specifies the routine method on whole…
Boric acid, boric oxide, disodium tetraborates and crude sodium borates for industrial use — Determi...
Specifies a method applicable to products in which the nickel content being determined exceeds 0,1 mg/kg. The principle of determination is based on dissolution of a test portion, formation of the coloured nickel furil -dioxime complex, extraction with chloroform and photometric measurement at a wavelength of about 435 nm.
Crude sodium borates for industrial use — Determination of alkali-soluble copper and manganese conte...
Describes a method applicable to products in which the alkalisoluble copper and manganese contents excess 0,25 and 0,5 mg/kg, respectively. The principle consists in successively determining the manganese and copper contents of the two coloured complexes obtained during the analysis, followed by photometric measurements at wavelengths of about 435 nm and 450 nm, respectively.
Crude sodium borates for industrial use — Determination of carbonate content — Gravimetric method
Covers a method based on reaction of the carbonate in a test portion with hydrochloric acid, absorption of the released carbon dioxide in soda asbestos and measurement of the increase in mass.
Caseins and caseinates — Determination of lactose content — Photometric method
Specifies a method for determining the lactose and other soluble carbohydrates content of caseins and caseinates containing less than 2.0 % of total soluble carbohydrates. Before precipitation of the casein with acetic acid and sodium acetate solution and subsequent filtration a test portion is dissolved either in hot water in the case of caseinates or in hot water with the addition of sodium…
Steel and cast iron — Determination of sulfur content — Gravimetric method
The method is applicable to products having sulphur contents greater than 0,003 % (m/m). It is particularly suitable as a reference method for the standardization of samples on which certified standard values are to be established. Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report.
Sodium hexafluorosilicate for industrial use — Determination of sulphur compounds content — Iodometr...
Applicable to products having contents, expressed as sulphate2- , between 0.03 % (m/m) and 0.5 % (m/m). Reduction of the compounds to hydrogen sulphide by heating with a mixture of hydriodic and hypophosphorus acids in the presence of hydrochloric acid. Entrainment of the hydrogen sulphide in a flow of nitrogen and absorption in an excess of ammoniacal cadmium acetate solution. Liberation of the…
