Chemical analysis of magnesium and its alloys — Determination of rare earths — Gravimetric method
The method is applicable to the determination of contents of rare earths between 0,2 and 10 %, in the absence of thorium. Specifies principle and procedure of the method, reagents, apparatus, sampling, expression of results and test report.
Boric acid for industrial use — Determination of boric acid content — Volumetric method
The method is based on titration of a dissolved test portion with a standard volumetric solution of sodium hydroxide in the presence of mannitol or sorbitol, using phenolphthalein as indicator. Water free from carbon dioxide, shall be used in the test .
Boric oxide for industrial use — Determination of boric oxide content — Volumetric method
The method is based on titration of dissolved test portion with a standard volumetric solution of sodium hydroxide in the presence of mannitol or sorbitol, using phenolphthalein as indicator. Water, free from carbon dioxide, shall be used in the test.
Disodium tetraborates for industrial use — Determination of sodium oxide and boric oxide contents an...
The principle of the method consists in determination of the sodium oxide content by addition of an excess of a solution of hydrochloric acid and back titration with a standard volumetric solution of sodium hydroxide in presence of methyl red/bromocresol green as indicator. In the same solution, titration of the boric oxide with standard volumetric solution of sodium hydroxide in the presence of…
Hydrated sodium perborates for industrial use — Determination of sodium oxide, boric oxide and avail...
Determination of the sodium oxide content by addition of an excess of a solution of hydrochloric acid and back titration with a standard volumetric solution of sodium hydroxide in presence of methyl red/bromocresol green as indicator. Subsequent titration of the boric oxide with the standard volumetric solution of sodium hydroxide in the presence of mannitol or sorbitol, using phenolphthalein as…
Liquefied phenol for industrial use — Determination of phenols content — Bromination method
The method is not specific for phenol. It determines tho total amount of material that can be brominated under the conditions of the test. It is applicable to mixtures of about 80 % (V/V) phenol and 20 % (V/V) water. The principle is based on reaction between phenol and bromine from a measured amound of standard bromide/bromate solution. Formation of tribromophenol, follwed by iodometric…
