ISO INTERNATIONAL STANDARD 3960 Fifth edition 2017-02 Animal and vegetable fats and oils Determination of peroxide value - Iodometric (visual) endpoint determination Corps gras d'origines animale et vegétale - Détermination de I'indice de peroxyde - Détermination avec point d'arrét iodométrique Reference number IS0 3960:2017(E) International Organization for Standardization @ IS0 2017 e=ZHEJIANG INST OF STANDARDIZATION C1 5956617 Not for Resale, 2017/5/11 02:23:54 mitted without license from IHS IS0 3960:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 · CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Internationai ibrg DrganizationforStandardization nsee-ZHEJIANG INSTOF STANDARDIZoISQ7 - All rights reserved Not for Resale, 2017/5/11 02:23:54 networking permited withoutlicense from IHS IS0 3960:2017(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Principle ..2 5 Reagents. .2 6 Apparatus ..3 7 Sampling. .4 8 Preparation of test sample ..4 9 Procedure 4 9.1 General 4 9.2 Preparation and titre determination of the O,01 N sodium thiosulfate standard solution...4 9.2.1 PreparationoftheO.o1Nsodiumthiosulfatestandard solution .4 9.2.2 Determination of the titre of the O,01 N sodium thiosulfate standard solution (factor determination). .5 9.3 Determination of peroxide value. .5 10 Calculation and expression of results .6 11 Precision of the method. ..6 11.1 Interlaboratory test ..6 11.2 Repeatability ..6 11.3 Reproducibility .7 12 Test report ..7 Annex A (informative) Results of an interlaboratory test .8 Bibliography .10 iii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vithout license from IHS