ISO INTERNATIONAL STANDARD 5724 First edition 2023-08 Jewellery and precious metals Determination of very high purity gold Difference method using ICP-MS Joaillerie, bijouterie et métaux precieux - Dosage de I'or de tres haute pureté - Méthode par difference utilisant la spectrométrie de masse a plasma a couplage inductif (ICP-MS) Reference number IS0 5724:2023(E) Tso @ ISO 2023 IS0 5724:2023(E) COPYRIGHT PROTECTED DOCUMENT @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 any form or by any means, electronic or mechanical, including photocopying, or posting on or IsoO's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2023 - All rights reserved