Boric acid, boric oxide and Disodium tetraborates for industrial use — Determination of manganese co...
The principle consists in removal of the boron by evaporation with methanol and separation of manganese and other metals from the residue, by extraction with chloroform, as their diethyldithiocarbamates. Wet destruction of the diethyldithiocarbamates with a sulphuric acid/ hydrogen peroxide mixture. Removal of any interfering iron by extraction as the thiocyanate. Formation of the coloured…
Crude sodium borates for industrial use — Determination of sodium oxide and boric oxide contents — V...
The principle of the method consists in determination of the Na2O content by treatment of an aqueous extract with an excess of hydrochloric acid solution, followed by back-titration with standard volumetric sodium hydroxide solution in the presence of methyl red as indicator. Subsequent titration of the boric oxide with standard volumetric sodium hydroxide solution in the presence of mannitol or…
Carbon tetrachloride for industrial use — Methods of test
The document specifies the sampling, the measurement of colour in Hazen units, determination of distillation characteristics, determination of density at 20 °C, determination of residue on evaporation, determination of water content, determination of the cloud point and the determination of carbon disulphide content. The principle of the CS2 determination is based on reaction of the carbon…
Liquid chlorine for industrial use — Determination of water content — Gravimetric method
The method relates to the determination of the "volatile water", that which volatilizes at the same time as the chlorine. It is applicable to products having a water content greater than 0,0005 % (m/m). It should not be applied to samples stored in bottles subject to corrosion. The principle consists in absorption of the water by passing the gasified sample into tared absorbers…
Sodium and potassium silicates for industrial use — Determination of silica content — Titrimetric me...
The principle consists in neutralization of the alkalinity of a test portion, previously dissolved, in presence of methyl red as indicator. Addition of sodium fluoride, which reacts with the silicic acid, forming a euaivalent quantity of sodium hydroxide. Addition of a measured volume of standard volumetric hydrochloric acid solution in excess, followed for diluting by ethanol. Filtration of the…
Liquid chlorine for industrial use — Determination of the content of chlorine by volume in the vapor...
The principle consists in sampling of a known volume of chlorine (about 100 ml) obtained by gasification of liquid chlorine. Absorption of the chlorine by a 2% zinc amalgam in the presence of 1 ml of saturated sodium chlorine solution. Measurement of the residual, non-condensable gases such as H2, O2, N2, CO, CO2, etc. Calculation of the volume of chlorine from the difference from total volume,…
Sodium hydrogen carbonate for industrial use — Determination of moisture content — Gravimetric metho...
The method is applicable to products having a content greater than 0,1 % (m/m). The principle consists heating the test protion, distributed in a thin layer, at 250 °C to constant mass. The water and of carbon dioxide, corresponding to the decomposition of sodium hydrogen carbonate into sodium carbonate.
