ISO INTERNATIONAL STANDARD 5398-4 IULTCS/IUC 8-4 Second edition 2018-12 Leather Chemical determination of chromic oxide content- Part 4: Quantification by inductively coupled plasma (ICP) Cuir - Dosage chimique de I'oxyde de chrome - Partie4:Quantificationparplasmaa couplage inductif (IcP) Reference numbers ISO 5398-4:2018(E) ISO IULTCS/IUC 8-4:2018(E) @IS0 2018 IS05398-4:2018(E) IULTCS/IUC8-4:2018(E) COPYRIGHTPROTECTEDDOCUMENT IS02018 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 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: ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122.749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii ISO 2018-Allrights reserved IS0 5398-4:2018(E) IULTCS/IUC 8-4:2018(E) Contents Page Foreword iv Introduction. .vi 1 Scope .1 2 Normativereferences .1 3 Terms and definitions .1 4 Principle .2 5 Sampling and sample preparation .2 6 Reagents .2 7 Apparatus. .2 8 Methods 2 8.1 Preparation of analytical solution 2 8.1.1 Wet oxidation method. 2 8.1.2 Microwavedigestionorothermethodofdigestion 3 8.2 Measurement oftheaqueous solution. 3 8.2.1 General 3 8.2.2 Preparation of calibration graph 3 8.2.3 Analysis ofthetest solution .3 9 Calculationandexpressionofresults. .4 10 Test report .4 Annex A (informative) Determination of water and other volatile matter .5 AnnexB (informative)SuitableICPequipment 6 @ IS0 2018 - All rights reserved iii