Sulphuric acid and oleums for industrial use — Determination of oxides of nitrogen — 2,4- Xylenol sp...
The method ia applicable of oxide of nitrogen contents equal to or greater than 0,00002 % (m/m). The principle is based on oxidation of nitrous nitrogen to nitric nitrogen by potassium permanganate. Reaction of nitric nitrogen with 2,4-xylenol under specified conditions to form a nitrate derivate. Distillation of the nitrate derivate and absorption in sodium hydroxide solution. Spectrophotometric…
Lined industrial rubber boots with general purpose oil resistance
In the Annex are specified sampling conditioning of the test pieces, temperature and duration of the test and immersion liquid, size of the test piece, apparatus and procedure. A formula is given to calculate the change in volume.
Ammonium nitrate for industrial use — Measurement of pH value — Potentiometric method
The measurement is carried out at a concentration of 100 g/l. The principle consists in measurement at a temperature of (20 +- 1) °C, using a pH meter fittet with glass and calomel electrodes. Water, free from carbon dioxide, shall be used in the analysis.
Liquid chlorine for industrial use — Determination of water content using an electrolytic analyser
Specifies a method for the determination of the volatile water, that which volatilizes at the same time as the liquid chlorine. It is intended for products with a moisture content of 0,001 % (m/m). The principle consists in contious absorption of the water in the gasified chlorine, flowing at a rate of 100 ml/min over phosphorus pentoxide applied in a thin layer on a glass rod. The glass rod…
Sodium hydrogen carbonate for industrial use — Determination of sodium carbonate — Titrimetric metho...
Applicable to products having content greater than 0,02 % (m/m). The principle consists in dissolution, in a specified volume of sodium chloride solution saturated at 20 °C, of the total sodium carbonate present in the test portion. Filtration of the insoluble matter which constitutes the major part of the sodium hydrogen carbonate. Titration, in an aliquot part of the filtrate, of the total…
Liquid halogenated hydrocarbons for industrial use — Determination of residue on evaporation
The method specified can also be applied to other liquids behaving, in respect or evaporation, like halogenated hydrocarbons. The principle consists in evaporation of a test sample in a special apparatus in a platinum or borosilicate glass dish. Such an arrangement is shown in a figure. Weighing of the residue obtained after evaporation and drying at 110 °C to constant mass.
Crude sodium borates for industrial use — Determination of loss in mass after heating at 900 degrees...
In the case of anhydous salts, the weighing of the test portion is carried out directly into platinum crucible. Transfering of the crucible in a muffle furnace, maintained at (900 +- 50) °C. In case of hydrated sals, the weighing is also carried out directly; the test porion is previously heated in the flame of a Bunsen burner. Covering and placing of the crucible so that the Bunsen flame plys on…
