Boric acid, boric oxide, disodium tetraborates, sodium perborates and crude borates for industrial u...
Preliminary reduction of the iron(III) by hydroxylammonium chloride, if required, suppression of the interference of tin by oxalic acid. Formation of the coloured iron(III)-2,2'-dipyridyl complex in a buffered medium. Photometric measurement of the coloured complex at a wavelength of about 522 nm.
Crude sodium borates for industrial use — Determination of iron soluble in alkaline medium — 2,2...
Applicable to products in which the content of soluble iron exceeds 2 mg/kg. The preparation of the test solution is carried out according to ISO 2217. Reduction of the iron(III), contained in the aliquot part of the solution, with hydroxylammonium chloride. Formation of the coloured complex between iron(II) and 2,2'-dipyridyl in buffered solution. Photometric measurement of the coloured…
Crude sodium borates for industrial use — Determination of aluminium soluble in alkaline medium — ED...
Applicable to products in which the content of soluble aluminium, expressed as Al2 O3 , exceeds 100 mg/kg. The preparation of the test solution is carried out according to ISO 2217. The reaction proceeds with the formation of the complex between EDTA and aluminium in an aliquot part of solution. Decomposition of the complex using sodium fluoride. Titration of the amount of liberated EDTA against…
Aqueous hydrofluoric acid for industrial use — Sampling and methods of test
Contains also titrimetric methods for determination of the total acidity, the hexafluorosilicic acid content and the non-volatile acids content and a method for calculating the hydrogen fluoric content. Specifies the scope and the field of application of these methods and declares the principle of the procedures. This second edition results from the incorporation of Addendum in the first one.…
Liquid chlorine for industrial use — Method of sampling (for determining only the volumetric chlorin...
The method is applicable when an agreement has previously been reached between the interested parties for the removal of two representative samples during filling of the tank-wagon at the manufacturer's premises. It cannot be applied when it is intended to determine the water content. The principle consists in checking that the equipment used is gas-tight; collection of the samples in steel…
Sodium fluoride primarily used for the production of aluminium — Determination of chlorides content ...
Applicable to products having a chlorides content, expressed as chlorine, of equal to or more than 0.005 % (m/m). The principle consists in precipitation, in the presence of boric acid, of chloride ions with silver nitrate. Comparison of the opalescence of the test solution with that of standard matching solutions using Nessler tubes against a black background. Turbidimetric evaluation of the…
Stranded wire ropes for mine hoisting — Fibre components — Characteristics and tests
Specifies the nature and properties of the components together with the corresponding test methods. Describes the determination of water-soluble acids, the salt content, and the extractable content (dry matter and water content) as well as the expression of results.
Potassium chloride for industrial use — Determination of potassium content — Flame emission spectrop...
Is applicable to products having a minimum KCl content of about 95 % (m/m). The principle consists in dissolution of a test portion taken from the laboratory sample, previously ground and sifted. Acidification to pH 1 after suitable dilution, and atomization of the resultant solution in the burner of a flame spectrophotometer. Measurement of the intensity of the 766 nm ray, compared with the…
