Paints and varnishes — Determination of "soluble" metal content — Part 3: Determination of...
The principle consists in the aspiration of the test solution into a dinitrogen monoxide/acetylene flame. Measurement of the radiation emitted by barium at a wavelength of 553,5 nm. The ionization of barium atoms in the flame is suppressed by addition of potassium chloride. The method is applicable to coating materials having "soluble" barium contents in the range of about 0,05 % (m/m)…
Paints and varnishes — Determination of "soluble" metal content — Part 4: Determination of...
The principle of the AAS method consists in inspiration of the test solution into an acetylen/air flame. Measurement of the absorption of the selected spectral line emitted by a cadmium hollow-cathode or cadmium discharge lamp, in the region of 228,8 nm. The principle of the polarographic method consists in electrolysis of the test solution in a polarographic cell measurement of the corresponding…
Paints and varnishes — Determination of "soluble" metal content — Part 5: Determination of...
The principle consists in formation of a coloured complex from hexavalent chromium and diphenylcarbazide solution. After addition of orthophosphoric acid and sulfuric acid, spectralphotometric easurement of the colour at a wavelength in the region of 540 nm. The method is applicable to coating materials having hexavalent chromium contents in the range of about 0,05 % (m/m) to 5 % (m/m). This…
Carbonaceous materials used in the production of aluminium — Green and calcined coke — Determination...
A test portion of a dry, finely ground sample is heated in a tared platinum dish in a furnace at 700 degrees centigrade to constant mass. The residue is cooled and weighed.
Fruit and vegetable products — Determination of formic acid content — Part 2: Routine method
The method consists in quantitative entraining by steam of the acid present in a test portion, determing of the amount of iodine equivalent to the amount of bromine consumed by the acid in the distillate, by titration with sodium thiosulfate standard volumetric solution.
Fruits, vegetables and derived products — Determination of lead content — Flameless atomic absorptio...
The method consists in decomposing the organic matter in a nitric acid medium at high temperature and under pressure, and determining the lead(II) cation with a suitable spectrometer after the addition of orthophosphoric acid.
Cheese — Determination of nitrate and nitrite contents — Method by cadmium reduction and photometry
Describes a method suitable for hard, semi-hard and soft cheeses of various ages and for processed cheese. The principle is based on extraction of the cheese with warm water, precipitation of the fat and proteins, filtration and reduction of the nitrate in a portion of the filtrate to nitrite by means of copperized cadmium. The detection limits of the method are 5 mg of nitrate per kilogram and 0…
Guidelines for the presentation of International Standards dealing with the design of structures
The different approaches to the drafting of International Standards resulted in a lack of uniformity in the technical content, and in the layout and sequence of the subject matter, of such documents. This Technical Report has, therefore, been prepared to create guidelines for the presentation of International Standards dealing with the design of structures.
