ISO INTERNATIONAL STANDARD 2271 Second edition 1989-10-15 ANsI Internaf Doc Secr Surface active agents - [ Detergents Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure Agents de surface -- Détergents - Determination de la teneur en matiere active anionique selon une methode manuelle ou mécanique par titrage direct dans deuxphases Referencenumber ISO 2271 : 1989 (E) Copyright International Organization for Standardization No reproduction or networking pemited without license from IHS Not for Resale ISO 2271 : 1989 (E) Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through ISo technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISo, also take part in the work. ISO collaborates closely with the Internationai Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with ISo procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 2271 was prepared by Technical Committee ISO/TC 91, Surface active agents. This second edition cancels and replaces the first edition (ISo 2271 : 1972), of which it constitutes a minor revision. Annex A of this International Standard is for information only. ? ISO 1989 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher, International Organization for Standardization Casepostale56.CH-1211Geneve20.Switzerland Printed in Switzerland CopyrightInternational Organization for Standardization No reproduction or networking permited without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 2271 : 1989 (E) Surface active agents - Detergents -- Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure 1 Scope ISo 385-1 : 1984, Laboratory glassware - Burettes - Part 1: General requirements. This Internationai Standard specifies a manual or mechanical method for the determination of anionic-active matter present ISO607:1980, Surface active agents and detergents in detergents. Methods of sample division. The method is applicable to solids or to aqueous solutions of Iso 648 : 1977, Laboratory glassware -- One-mark pipettes. the active material. The relative molecular mass of the anionic active matter has to be known. ISo 1042 : 1983, Laboratory glassware - One-mark volu- metric flasks. The method is not applicable if cationic surface active agents are present. 3 Principle The manual method is thus applicable to the determination of alkylbenzene sulfonates; alkane sulfonates, sulfates and Determination of the anionic-active matter in a medium con- hydroxysulfates; alkyiphenol sulfates ; fatty alcohol methoxy- sisting of an aqueous and a chloroform phase by titration with a and ethoxysulfates; dialkylsulfosuccinates and other active standard volumetric cationic-active solution (benzethonium materials containing one hydrophilic group per molecule. chioride) in the presence of an indicator which consists of a mixture of a cationic dye (dimidium bromide) and an anionic The mechanical method is applicable to all the above- dye (acid blue 1). mentioned products provided it gives results comparable with those obtained using the manual method. NOTE - The chemical process is as follows : the anionic-active matter forms a salt