ISO INTERNATIONAL STANDARD 21253-1 First edition 2019-08 Water quality Multi-compound class methods - Part 1: Criteria for the identification of target compounds by gas and liquid chromatography and mass spectrometry Qualite de I'eau - Méthodes d'analyse de composés multi-classes Partie 1: Criteres pour I'identification de composées cibles par chromatographie en phase gazeuse ou liquide et spectrométrie de masse Reference number ISO 21253-1:2019(E) osi @ IS0 2019 IS0 21253-1:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 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 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved