Manganese ores and concentrates — Determination of silicon content — Gravimetric method
The method is applicable to products having a silicon content greater than 0,5 % (m/m) and a fluorine content not more than 0,1 % (m/m). Should be read in conjunction with ISO 4297. Specifies principle, reagents, apparatus, procedure and expression of results.
Chromium ores — Determination of hygroscopic moisture content in analytical samples — Gravimetric me...
The method is intended to be carried out simultaneously with the determination of other constituents of the same analytical sample so that the contents of the other constituents can be calculated on the basis of the absolutely dry ore. ISO 6129 should be read in conjunction with ISO 6629.
Agricultural food products — Determination of crude fibre content — General method
The method consists in boiling with sulphuric acid solution (after any necessary grinding and defatting), and separation and washing of the insoluble residue. Boiling this residue with sodium hydroxide solution, then separation, washing, drying and weighing of the insoluble residue, and determination of the loss in mass on incineration. An annex A specifies methods of extraction of fatty…
Specifies the designations and chemical compositions of qualities of zinc ingots with a minimum zinc content of 98,5 % (m/m), obtained by treatment of ores or of other zinc-bearing materials by a process of chemical or electrolytic reduction or by distillation.
The method is suitable as a reference method and is applicable to all fertilizers. It consists in precipitating of nitrate ions in acid solution as a complex with nitron reagent, filtrating of the precipitate, drying and weighing.
Surface active agents — Technical ethoxylated fatty amines — Methods of analysis
On separate test portions the following determinations are carried out: measurement of the apparent pH in methanolic medium; determination of the water content; determination of the distribution of primary, secondary and tertiary amines contents; determination of oxyethylene groups content; determination of sulphated ash. Furthermore an aqueous or methanolic solution of a test portion is prepared…
Surface active agents — Washing powders — Determination of total boron content — Titrimetric method
From an aqueous aolution of a sample the phosphates are removed by passing the solution over an ion-exchange resin. Then a boric acid mannitol complex is formed and titrated.
Manganese ores and concentrates — Determination of potassium and sodium content — Flame atomic emiss...
The method is applicable to a concentration range of 0,08 to 3 % (m/m) of potassium and 0,02 to 1 % (m/m) of sodium. ISO 4571 should be read in conjunction with ISO 4297. Specifies principle, reagents, apparatus, procedure and expression of results.
