Sulphuric acid for industrial use — Determination of chlorides content — Potentiometric method
Applicable to products having chloride contents equal or more than 0.0003 % (m/m) expressed in hydrochloric acid. Specifies the potentiometric titration of the chloride ions with silver nitrate solution in a sulphuric acid medium using a silver measurement electrode and a calomel reference electrode.
Brown coals and lignites — Classification by types on the basis of total moisture content and tar yi...
Brown coals are classified in this International Standard according to the following properties: total moisture content calculated on the ash-free basis; tar hiels calculated on the dry, ash-free basis. In tables class numbers, group number and code numbers of brown coal types are given.
Methyl ethyl 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, the examination of residual odour and the measurement of colour in Hazen units.
Potassium sulphate for industrial use — Determination of potassium content — Flame emission spectrop...
The principle of the method consists in dissolution of a test portion previosly ground and sifted. Acidification to pH 1 after suitable dilution and atomization of the resultant solution in the burner of a flame spectrophotometer. Determination of the potassium content by measurement of the intensity of the radiation emitted at 766 nm. Comparison with the intensity of standard potassium chloride…
Potassium hydroxide for industrial use — Determination of sodium content — Flame emission spectropho...
The method is applicable to products having sodium contents greater than 0.01 % (m/m). The principle consists in the dissolution of a test portion, followed by acidification to ph value 1. Atomization of the obtained solution in the burner of a flame spectrophotometer. Measurement of the intensity of the radiation emitted at 589 nm; comparison with the intensity obtained for standard sodium…
Magnesium and magnesium alloys — Determination of manganese — Periodate photometric method (Manganes...
The method is applicable to the determination of manganese content in magnesium and magnesium alloys which do not contain zirconium, rare earths, or thorium. Specifies principle and procedure of the method, the reagents, apparatus, sampling, expression of results and test report.
Aluminium alloys — Determination of copper — Electrolytic method
The method is applicable to the determination of copper content greater than or equal to 0,50 % in aluminium alloys. The method is not completely applicable to alloys containing tin or antimony (see annex A) or bismuth (see annex B), for which it should be modified.
Sulphuric acid and oleum for industrial use — Determination of lead content — Dithizone photometric ...
Applicable to the determination of contents exceeding 1 mg/kg. The principle bases on evaporation of the test portion, dissolution in hydrochloric acid and reduction by hydroxylammonium chloride. Formation of complexes of interferring elements with ammonium citrate and potassium cyanide. Extraction of the lead at a pH of between 8.5 and 10 by a solution of dithizone in chloroform. Elimination of…
