ISO INTERNATIONAL STANDARD 6842 Second edition 1989-10-01 Surface active agents - s Sulfated ethoxylated alcohols and alkylphenols - I Determination of total active matter content Agents de surface - Sulfates d'alcools et d'alkylphénols éthoxyles - Détermination de la teneur en matiere active totale Reference number ISO 6842 : 1989 (E) n for Standardizatior No reproduction or networking permited withoutlicense from IHS Not for Resale ISO 6842 : 1989 (E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (lsO 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 International Electrotechnical Commission (IEC) on all matters ofelectrotechnical 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 6842 was prepared by Technical Committee ISO/TC 91, Surfaceactiveagents. This second edition cancels and replaces the firstedition (ISO 6842 :1983),of which it constitutes a minor revision. ISO1989 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-1211Geneve20Switzerland Printed in Switzerland Copyright Internatioal Organizatin for Standadization No reproduction or networking permitted without license from IHS Not for Resale INTERNATIONALSTANDARD ISO 6842 : 1989 (E) Surface active agents - Sulfated ethoxylated alcohols and alkylphenols Determination of total active matter content 1 Scope 4.3 Sodium sulfate, anhydrous. This International Standard specifies a method for the deter- 4.4 Acetone, 50 % (V/V) aqueous solution. mination of the total active matterpresent inordinary commer- cial neutralized products of sulfation of ethoxylated alcohols or alkylphenols [alkyl oxyethylene sulfates (ethoxylated alcohol 4.5 Silver nitrate, standard volumetric solution, sulfates)oralkylphenoloxyethylenesulfates (ethoxylated c(AgNO3) = 0,1 mol/1. alkylphenol sulfates)l. 4.6 6Potassium chromate, 100 g/l indicator solution. inethanol (alkylether sulfates, alkylphenylether sulfates, polyglycol suifates and non-ionic fractions). 5 Apparatus 2 Normative reference Ordinary laboratory apparatus and : The following standard contains provisions which, through 5.1 Conical flask, of capacity 250 ml, with a ground glass reference inthis text,constituteprovisions of this International neck. Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision,and parties to 5.2 Rotary evaporator, with round-bottomed flasks of agreements based on this International Standard are encour- capacity250ml. aged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and Iso maintain registers of currently valid International Stan- 5.3 Condenser, to fit the conical flask (5.1). dards. ISO607：1980, Surface active agents and detergents 6 Sampling Methods of sample division. The laboratory sample of surface active agent shall be prepared 3 Principle and stored in accordance with the requirements of isO607. Boiling, under reflux, of a test portion with ethanol in the presence of sodium sulfate. Filtration, evaporation of the 7 Procedure fi