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.
Sodium fluoride for industrial use — Preparation and storage of test samples
Relates to crude samples intended for the determination of moisture content and dried samples for chemical tests. Processing by grinding and sieving until the sample passes completely through a sieve of mesh aperture 0.125 mm. Thoroughly mixing and drying and storing in a tightly closed container.
Benzyl chloride for industrial use — Methods of test
Characterizes the product and gives the main impurities. Specifies methods for the determination of the crystallizing point and density and the procedure of the gas chromatographic analysis. Details the principle of determination of the product and its impurities, especially benzal chloride, benzaldehyde, toluene, chlorotoluene, etc., by the gaschromatography (relates to ISO 2818).
Sodium perborates for industrial use — Determination of particle size distribution by mechanical sie...
Details the mechanical sieving of a test portion under specified conditions by means of a series of circular test sieves and an automatic device. Weighing of each of the fractions. 18712675ISO 3201
Boric acid, boric oxide and disodium tetraborates for industrial use — Determination of chromium con...
Alkaline fusion of a test portion by sodium carbonate and subsequent neutralization by sulphuric acid. Measurement of the absorption of the complex formed by chromium and diphenylcarbazide at a wavelength of abour 540 nm after adding sodium azide for elimination of the colour caused by manganese.
diSodium tetraborates and crude sodium borates for industrial use — Determination of water content ...
Heating a test portion in a combustion tube at 250 0C, later at 500 0C. Passing through the liberated water carried by a flow of nitrogen into a tared absorption vessel filled with magnesium perchlorate. Weighing the absorption vessel and determination of the mass of water by difference.
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.
