Potassium hydroxide for industrial use — Method of assay
Method for determination of the titre, conventionally expressed as percentages by mass of KOH. There are three ways: a) total alkalinity, b) caustic alkalinity corresponding to the total alkalinity less the alkalinity due to carbonates and c) actual potassium hydroxide corresponding to the total alkalinity less the alkalinity due to carbonates and any hydroxide which may be present. The principle…
Sodium hydrogen carbonate for industrial use — Determination of iron content — 1,10- Phenanthroline ...
The method is applicable to products having a content equal to or greater than 0,1 mg/kg. The principle concists in reduction of the iron(III) by hydroxylammoniumchloride. Formation of a iron(II)-1,10-phennanthroline complex in a buffered solution. Photometric measurement of the coloured complex at a wavelength of about 510 nm.
Sodium chlorate for industrial use — Determination of moisture content — Gravimetric method
The method is applivable to products with a content greater than 0,02% (m/m). It is not applicable to the analysis of mixtures such as herbicides and insecticides. The principle is based on heating of a test portion, spread in form of a thin layer, at 105 °C. Weighing and calculation of the loss of mass by difference before heating and after heating.
Sodium chlorate for industrial use — Determination of matter insoluble in water
The method is applicable to the analysis of products with a content greater than 0,01 % (m/m). The method is not applicable to mixtures based on sodium chlorate, such as herbicides and insecticides. The test portion is dissolved in water. Filtration of the resultant solution through a filter crucible. Washing, drying and weighing of the residue.
Sodium chlorate for industrial use — Determination of chloride content — Mercurimetric method
The method is applicable to products with a content greater than 0,01 % (m/m). It is not applicable to the analysis of mixtures of products such as herbicides and insecticides. The principle consists in titration of the chloride ions with mercury(II) nitrate in the presence of diphenylcarbazone as indicator.
Potassium hydroxide for industrial use — Sampling — Test sample — Preparation of the main solution f...
Provides certain indications relating to the sampling and indicates the conditions under which the test sample should be prepared The special properties which make particular precautions essential such as hygroscopic characteristics, absorption of carbon dioxide, corrosive action on containers, should be stressed. The preparation of the main solution is carried out by dissolution of the test…
Sodium chloride for industrial use — Determination of calcium and magnesium contents — EDTA complexo...
The method is applicable to water-soluble salts for contents greater than 0,001 % (m/m). In a special case, the determination of ions in a principal solution prepared in an acid medium is pooible. The principle consists in dissolution of a test portion and separation of insoluble matter. Titration of the filtrate obtained according to ISO 2479 using disodium ethylendiamintetraacetate (EDTA) in…
Sodium hydroxide for industrial use — Determination of chloride content — Mercurimetric method
The method is applicable to products of which the chloride content is greater than 0.005 % (m/m). The procedure based on titration of the chloride ions with mercury(II) nitrate in the presence of diphenylcarbazone as indicator. - Replaces ISO Recommendation R 981-1969.
