Sulphur for industrial use — Determination of total carbon content — Titrimetric method
Gives the potentiometric and visual methods als alternatives for the final titration. The principle consists in the combustion of the sulphur in a current of oxygen. Oxidation and fixation of the sulphur dioxide and trioxide gases in chromic and sulphuric acid solutions. Absorption of the carbon dioxide formed in a solution of barium hydroxide, followed by titration in the presence of…
Leather — Raw hides of cattle and horses — Method of trim
Applicable to all cattle and horse raw hides, obtained after slaughtering and flaying, intended for the tanning industrie. Two figures show the shape requirements.
Glycerols for industrial use — Determination of arsenic content — Silver diethyldithiocarbamate phot...
The method is applicable tp products with a content greater than 0,1 mg/kg. It is applied to a test portion as it is, and to another identical portion with a known quantity of arsenic added. The principle consists in reduction of the arsenic by zinc in a hydrochloric acid medium, with the formation of arsine; absorption of the arsine in a solution of silver diethyldithiocarbamate in pyridine.…
Urea for industrial use — Measurement of colour in Hazen units (platinum-cobalt scale) of a urea-for...
Lays down the principle of the visual comparison of the colour of a solution of the sample in formaldehyde, stabilized at a pH of 10 0.1, with that of colour standards. Expression of the results in terms of Hazen units. For routine control purposes, referring to ISO 2211. The method has also been approved by the IUPAC.
isoButyl methyl ketone for industrial use — List of methods of test
Specifies the sampling, the determination of distillation characteristics, of the density at 20 0C, of residue on evaporation on a water bath, of the water content, of alcoholic impurities, of the acidity to phenolphthalein and the measurement of colour.
