ISO 2871-2: Determination of Low Molecular Mass Cationic Active Substance

The ISO 2871-2 standard includes the test method for the determination of low molecular mass cationic active materials (such as monoamines, amine oxides, quaternary ammonium compounds and alkylpyridinium salts) with a main chain of 10 to 22 carbon atoms and not more than 6. This test method is not applicable in the presence of anionic or amphoteric surfactant.

Principle of Analysis;
- In the presence of an indicator consisting of mixed anionic and cationic dyes, the cationic active substance in the sample to be analyzed is titrated with aqueous chloroform against a standard anionic surfactant.
- The cationic surfactant in the sample reacts with the anionic dye to form a salt that dissolves in the chloroform layer and gives a blue color.
- During titration, the anionic surfactant replaces the anionic dye, forming a salt with the cationic dye at the end point, giving a grayish pink color to the chloroform layer.

ISO 2871-2: Surface active agents — Detergents — Determination of cationic-active matter content — Part 2: Cationic-active matter of low molecular mass (between 200 and 500)

For Determination of Low Molecular Mass Cationic Active Substance in Surfactants, Disinfectants and Detergents You can contact Nanolab Detergent Analysis Laboratory.