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Sodium chloride for industrial use -- Determination of calcium and magnesium contents -- EDTA complexometric methods
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 possible.
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 ethylenediaminetetraacetate (EDTA) in the presence of glyoxal-bis-(2-hydroxyanil) (GBHA) and mordant black 11 (Cl 14645) respectively as indicators.
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