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…
Toluene — Determination of hydrocarbon impurities — Gas chromatographic method
Applicable to the quantitative determination of contents of benzene, C8 aromatics and aliphatics up to n-nonane in the range between 0.01 % (m/m) and 1.00 % (m/m). Alternatives that will give equivalent results may also be used. Addition of a known amount of intgernal standard to a test portion and introduction of an aliquot portion of this mixture into a separating column. Sweeping of the…
Milk and milk products — Determination of copper content — Photometric reference method
Applies to milk, skimmed milk, whey, buttermilk, evaporated milk, sweetened condensed milk, dried whole and skimmed milk, cream and butter, butterfat, ice-cream, hard, semi-hard and soft cheese of various ages and processed cheese, caseins, caseinates and coprecipitates. The principle of determination consists in digesting the organic material with a mixture of nitric and sulfuric acids and…
Ferromolybdenum — Determination of molybdenum content — Gravimetric method
The method is applicable to molybdenum contents in the ranges normally found in ferromolybdenum. Specifies principle, reagents, apparatus, sample, procedure, expression of results, reproducibility and test report.
Anhydrous hydrogen fluoride for industrial use — Determination of water content — Conductimetric met...
Suitable for use as a routine alternative to the Karl Fischer method specified in ISO 3699 but may give a lower standard of accuracy. Applicable to products having a water content between 0.01 % (m/m) and 0.4 % (m/m). Bases on the measurement of the conductance of anhydrous products using a dip cell electrode. Determination of the corresponding content by means of a calibration graph making a…
