Sodium and potassium silicates for industrial use — Determination of total alkalinity — Titrimetric ...
The principle of the procedure based on titration of a test portion with a standard volumetric hydrochloric acid solution, in the presence of methyl orange as indikator. The alkalinity is expressed as a percentage by mass of sodium oxide potassium oxide.
Boric acid, boric oxide and disodium tetraborates for industrial use — Determination of chloride con...
The principle consists in titration of the cloride ions with standard volumetric mercury(II) nitrate solution in presence of diphenylcarbazone as indicator until the colour of the solution matches the mauve of the standard end-point matching solution.
Gaseous halogenated hydrocarbons (liquefied gases) — Taking of a sample
Applicable for sampling from containers (cylinders, drums, tanks, etc.). Sampling of the product in a steel cylinder, previously cleaned, dried and evacuated. The stainless steel cylinder shall be capable of withstanding an internal pressure of at least 3 MPa (30 bar). The cylinder is filled to the filling ratio allowed by the safety considerations. Details are given in the relevant international…
Sodium fluoride primarily used for the production of aluminium — Determination of chlorides content ...
Applicable to products having a chlorides content, expressed as chlorine, of equal to or more than 0.005 % (m/m). The principle consists in precipitation, in the presence of boric acid, of chloride ions with silver nitrate. Comparison of the opalescence of the test solution with that of standard matching solutions using Nessler tubes against a black background. Turbidimetric evaluation of the…
Potassium chloride for industrial use — Determination of potassium content — Flame emission spectrop...
Is applicable to products having a minimum KCl content of about 95 % (m/m). The principle consists in dissolution of a test portion taken from the laboratory sample, previously ground and sifted. Acidification to pH 1 after suitable dilution, and atomization of the resultant solution in the burner of a flame spectrophotometer. Measurement of the intensity of the 766 nm ray, compared with the…
