Sodium fluoride for industrial use — Determination of moisture content
Describes a gravimetric method of analysis. It consists in drying a test portion in an electric oven ventilated by convection at (110 2) 0C. Calculation of the moisture content by the loss of mass. Has also been approved by the IUPAC.
Sodium fluoride for industrial use — Determination of fluorine content — Modified Willard-Winter met...
The principle consists in separation of the fluorine from a test portion by distillation with sulphuric acid or perchloric acid. Titration with thorium nitrate solution using sodium alizarinsuphonate and methylene blue as indicators. Alternatively the thorium nitrate titration may be carried out using sodium alizarinsuphonate alone as indicator, the end-point being determined…
Acetaldehyde for industrial use — Determination of total content of carbonyl compounds — Volumetric ...
Volumetric method of the determination of carbonyl compounds present by reaction with hydroxylammonium chloride and titration with standard volumetric sodium hydoxide solution in the presence of bromophenol blue as indicator. Has also been approved by the IUPAC.
Acetaldehyde for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric m...
The principle consists in the evaporation to dryness of a test portion and dissolution of the residue in hydrochloric acid. Reduction of iron(III) by means of hydroxylammonium chloride. Formation of the iron(II)- 2,2'-dipyridyl complex. Photometric measurement of the coloured complex at a wavelength of about 522 nm. Specifies the use of a spectrophotometer or photoelectric absorptionmeter.…
Lays down the treatment of a test portion by dilution with water (or with ethanol or propan-2-ol if the sample is not completely soluble in water) and removal of carbon dioxide by passing a strem of nitrogen through the solution. The determination is carried out by titration with a standard volumetric sodium hydroxide solution using phenolphthalein as indicator. The nitrogen used shall be free…
Furfural for industrial use — Determination of acidity to phenolphthalein — Volumetric method
Pretreatment of the water used, freshly boiled and cooled, by neutralization by addition of the standard volumetric sodium hydroxide solution or sulphuric acid solution as required. Addition of the test portion and titration with the standard volumetric sodium hydroxide solution in presence of phenolphthalein as indicator until the apperance of a pale pink colour.
Aluminium fluoride for industrial use — Preparation and storage of test samples
Specifies the procedure of treatment of crude samples and dried samples. The crude sample is intended for the determination of certain geometrical characteristics and physical and physico-chemical tests including moisture determination. The dried sample is intended especially for chemical tests. The principle consists in grinding followed by sieving of the sample until the whole mass passes…
Textiles — Integrated conversion table for replacing traditional yarn numbers by rounded values in t...
This International Standard is intended to facilitate the changeover by industry and commerce from traditional yarn numbering systems to the Tex System. It provides a range of recommended rounded linear densities in the Tex System to replace the yarn numbers in the six main traditional numbering systems.
Hydrochloric acid for industrial use — Determination of soluble sulphates — Turbidimetric method
The turbidimetric method is applicable to products containing less than 0.1 % (m/m) of soluble sulphates. The principle consists in evaporation of a test portion to dryness and solution of the residue in hydrochloric acid. Measurement of the turbidity obtained by precipitation, under well defined conditions, of barium sulphate. Has also been approved by the IUPAC.
