ISO INTERNATIONAL STANDARD 19070 IULTCS/IUC 34 First edition 2016-03-01 Leather Chemical determination of N-methyl-2-pyrrolidone (NMP) in leather Cuir Détermination de la teneur en N-methyl-2- pyrrolidone (NMP) dans le cuir Referencenumbers ISO 19070:2016(E) Iso IULTCS/IUC 34:2016(E) Copyright intematioal Organization for Standardizatin @IS02016 IS0 19070:2016(E) IULTCS/IUC 34:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, 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 [email protected] www.iso.org @ IS0 2016 - All rights reserved No reproductic networking permited withoutlicense from IHS IS0 19070:2016(E) IULTCS/IUC 34:2016(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Principle 4 Reagents. ..1 5 Apparatus. ..1 6 Procedure. ..2 6.1 Preparation of standard solutions . 2 6.1.1 NMP stock solution (1 000 μg/ml) .2 6.1.2 NMP Calibration solution .2 6.2 Sample preparation. .2 6.3 Extraction procedure .2 7 Chromatographic determination .2 8 Quantification .3 9 Performance of the method .3 10 Test report .3 Annex A (informative) Chromatographic analysis pyrntnematonal rights reerved iii without license from IHS