ISO INTERNATIONAL STANDARD 23597 Firstedition 2023-08 Rare earth Determination of rare earthcontentinindividualrareearth metals and their oxides - Titration method Terresrares-Determinationdelateneurenterresraresdansles metaux des terres rares individuels et leurs oxydes-Methode de titrage Referencenumber IS023597:2023(E) ISO @ISO2023 IS0 23597:2023(E) COPYRIGHTPROTECTEDDOCUMENT IS02023 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in anyform or by anymeans, electronic or mechanical, including photocopying, orposting on theinternetoran intranet,withoutpriorwrittenpermission.Permissioncanberequestedfrom eitherIsoattheaddressbelow or ISO's member body in the country of the requester. ISO copyright office CP401 : Ch.de Blandonnet 8 CH-1214 Vernier,Geneva Phone: +4122 749 0111 Email: [email protected] Website:www.iso.org Published in Switzerland ii @IS0 2023-All rights reserved