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Homepage>ISO Standards>ISO 2871-2:1990-Surface active agents-Detergents-Determination of cationic-active matter content
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download between 0-24 hoursReleased: 1990
ISO 2871-2:1990-Surface active agents-Detergents-Determination of cationic-active matter content

ISO 2871-2:1990

Surface active agents

CURRENCY
42 EUR
Standard´s number:ISO 2871-2:1990
Pages:4
Edition:1
Released:1990
Language:English
DESCRIPTION

ISO 2871-2:1990


The method is also suitable for other cationic-active materials. Not applicable if anionic and/or amphoteric surface active agents are present. The sample is titrated in a two-phase (aqueous chloroform) system against a standard anionic surface active agent in the presence of an indicator consisting of mixed anionic and cationic dyes. The cationic surface active agent present in the sample initially reacts with the anionic dye to form a salt which dissolves in the chloroform, imparting a blue colour to this layer. During the titration, the anionic surface active agent displaces the anionic dye and, at the end point, forms a salt with the cationic dye, imparting a greyish-pink colour to the chloroform layer.