2869 NTERNATIONAL STANDARD tso) Surface active agents -- Detergents -- Anionic-active matter hydrolyzable under alkaline conditions -- Determination of hydrolyzable and non-hydrolyzable anionic-active matter First edition - 1973-12-01 DEC11S sNsT Tmtorrat Doc sect UDC 661.185 : 543 Ref. No. ISO 2869-1973 (E) 171 Descriptors : surfactants, detergents, chemical analysis, determination of content, anionic-active matter, volumetric analysis, alkaline conditions. Price based on 2 pages Copyright International Organization for Standardization from IHS Not for Resale FOREWORD Iso (the International Organization for Standardization) is a worldwide federation of nationat standards institutes (isO Member Bodies). The work of developing International Standards is carried out through ISO Technical Committees. Evcry Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. Internationat organizations, governmental and non-governmental, in liaison with isO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated Standards by the Iso Council. Committee ISO/TC 91, Surface active agents, and circulated to the Member Bodies in August 1972. It has been approved by the Member Bodies of the following countries : Austria Ireland Spain Belgium Japan Switzerland Egypt, Arab Rep. of Mexico Thaitand France Turkey New Zealand Germany Poland United Kingdom Hungary Romania U.S.S.R. eipui South Africa, Rep. of This International Standard has aiso been approved by the International Union of Pure and Applied Chemistry (IUPAC). No Member Body expressed disapproval of the document. @ International Organization for Standardization, 1973 Printed in Switzerland Copyright International Organization for Standardization Not for Resale INTERNATIONAL STANDARD ISO 2869-1973 (E) Surface active agents - Detergents - Anionic-active matter hydrolyzable under alkaline conditions -- Determination of hydrolyzable and non-hydrolyzable anionic-active matter 1 SCOPE AND FIELD OF APPLICATION 4.2 Sulphuric acid, 5 N solution. This International Standard specifies a method for the 4.3 Sulphuric acid, 1,0 N solution. determination, in detergents, of anionic-active matter hydrolyzable under alkaline conditions. 4.4 Sodium hydroxide, 1,0 N standard volumetric This active matter includes dialkylsulphosuccinates and solution. fatty acid glyceride sulphates. The method is applicable to the analysis of mixtures containing hydrolyzable and 4.5 Sodium lauryl sulphate, 0,004 M standard volumetric non-hydrolyzable anionic-active matter. solution. The molar mass of the two types of active matter must be 4.6 Benzethonium chloride, 0,004 M standard volumetric known previously determined, if their content is solution. expressed as a percentage by mass. 4.7 Phenolphthalein solution. 2 REFERENCE 4.8 Mixed indicator solution. ISO 2271, Surface active Detergents agents - the following reagents are necessary : Determination of anionic-active matter (direct two-phase titration procedure). 4.9 Sodium hydroxide, 10 N solution. 4.10 Sulphuric acid, 10 N solution. 3 PRINCIPLE 5 APPARATUS Titration of an aliquot portion of a sample solution with benzethonium chloride solution according to the direct Ordinary laboratory apparatus, and two-phase titration procedure described in IsO 2271. Hydrolysis, by refluxing under alkaline conditions of a 5.1 Conical flask, 250 mi, with a conical ground glass second aliquot portion of the sample solution. joint. Titration of unhydrolyzed anionic-active matter with 5.2 Reflux condenser, water-cooled, with a conicai ground benzethonium chloride solution as before. glass joint at the bottom. Calculation of the contents of hydrolyzable pue non-hydrolyzable anionic-active matter from the results obtained. 6 PROCEDURE 6.1 Determination of total anionic-active matter Carry out the determination of total anionic-active matter 4 REAGENTS present in t