Analysis of soaps — Determination of glycerol content — Titrimetric method
The determination is carried out in the following way: Decomposition of the soap with sulphuric acid, and extraction of the fatty acids with light petroleum. Oxidation of the glycerol by periodic acid to formic acid and formaldehyde, and titration of the formic acid produced using a pH meter.
Wool — Determination of cysteic acid content of wool hydrolysates by paper electrophoresis and color...
Cysteic acid is one of the oxidation products of the amino acids cystine and cysteine. The cysteic acid content of raw wool is normally very low. It increases with photochemical degradation (weathering). Finishing processes such as bleaching or chlorination always result in an increase in cysteic acid. The severity of any kind of oxidation may be determined directly by quantitative determination…
Glycerine for industrial use — Determination of glycerol content — Titrimetric method
Applicable to the analysis of glycerines free from organic compounds other than glycerol having more than two hydroxyl goups on adjacent carbon atoms, such as sugars which can also give rise to formic acid and, for this reason, will interfere in the determination. The procedure begins with a cold oxidation of the glycerol by sodium periodate in a strongly acid medium, followed by titration of the…
Crude sodium borates for industrial use — Determination of total aluminium content — Titrimetric met...
Applicable to products having a total content up to 1 %. Is not applicable in the presence of zirconium or titanium. More than 0.006 % of iron will interfere in the determination. The principle bases on fusion of a test portion with sodium carbonate and extraction of the molten mass with hydrochloric acid. Formation of a complex by the addition of the disodium salt of ethylenediamintetra-ecetic…
Crude sodium borates for industrial use — Determination of total titanium content — Photometric meth...
Applicable to products having contents up to 0.1 % (m/m). The method specified is not applicable in the presence of vanadium or high silica content. Molybdenum and chromium also interfere. The analysis bases on fusion of a test portion with sodium corbonate, extraction of the cooled melt with suphuric acid and the addition of hydrogen peroxide. Photometric measurement of the yellow coloured…
The Standard specifies the following characteristics of the oil. Appearance: Clear liquid. Colour: Greenish-yellow. Odour: Resembling oil of sweet orange. Relative density at 20/20 °C: 0,852 - 0,860. Refractive index at 20 °C: 1,4740 - 1,4790. Optical rotation at 20 °C: Range from + 91 to + 96 . Carbonyl compounds content, expressed as decanal: Minimum 1,0 %. Residue on evaporation: 5,0 % - 10,0…
Sodium and potassium silicates for industrial use — Determination of sulphates content — Barium sulp...
Applicable to the analysis of products having contents either above 0.1 % (m/m) or above 0.25 % (m/m) according to whether the product is readily or sparingly soluble in water. The principle consists in dissolution of a test portion either directly or after alkaline fusion. Separation of the insoluble matter. Precipitation, while boiling, of the sulphate ions in an acid medium. Filtration,…
Sodium hydroxide for industrial use — Determination of chlorides content — Photometric method
Applicable to products having contents, expressed as chlorine, between 2 mg/kg and 50 mg/kg. For contents exceeding 50 mg/kg the method specified in ISO 981 shall be used. The principle consists in the quantitative displacement of the thiocyanate ions of the mercury(II) thiocyanate by the cloride ions contained in the test portion. Reaction of the thiocyanate ions with iron(III) nitrate to form…
Sodium hydroxide for industrial use — Sampling — Test Sample — Preparation of the main solution for ...
Indicates the conditions under which the test sample shall be prepared and relates to particular properties which require particular precausions: the samples shall be taken rapidly in a dry atmosphere, storage in an airtight bottle. The bottle shall be made from an inert material such as polyethylene. Preparation of the main solution with distilled carbonat- free water. If the silica content is…
