本方法适用于含量大于0001%（m/m）的水溶性盐。在特殊情况下，可以测定在酸性介质中制备的主溶液中的离子。其原理包括溶解试验部分和分离不溶物。分别以乙二醛双-（2-羟基苯胺）（GBHA）和媒介黑11（Cl 14645）为指示剂，使用乙二胺四乙酸二钠（EDTA）滴定根据ISO 2479获得的滤液。

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 the presence of glyoxal-bis-(2-hydroxyanil) (GBHA) and mordant black 11 (Cl 14645) respectively as indicators.