ISO INTERNATIONAL STANDARD 787-28 First edition 2019-05 General methods of tests for pigments and extenders - Part 28: Determination of total content of polychlorinated biphenyls (PCB) by dissolution, cleanup and GC-Ms Méthodes generales d'essai des pigments et matieres de charge - Partie 28: Détermination de la teneur totale en biphenyles polychloreés dans les pigments organiques par dissolution, purification et CG-SM Reference number IS0 787-28:2019(E) osi @ IS0 2019 IS0 787-28:2019(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: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 787-28:2019(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Principle ..2 5 Sampling. ..2 6 Procedure. .2 6.1 General .2 6.2 Clean-up to eliminate interfering species .3 6.3 Separation and quantification .3 7 Reagents .3 7.1 Safety precautions. .3 7.2 Reagents, solvents and absorbents. 4 7.3 Internal reference materials for PCBs, 13C12-labelled .5 7.4 Cleaning/disposal agents. .5 8 Apparatus .5 9 Procedure .6 9.1 Preparation of test sample .6 9.2 Liquid-liquid extraction 7 9.2.1 Separation funnel 7 9.2.2 Ludwig extraction 8 9.3 Clean-up .8 9.3.1 General ..8 9.3.2 Diatomaceous earth-sulfuric acid column (optional) .8 9.3.3 Gel permeation (size exclusion) chromatography/porous styrene divinylbenzene beads-column (optional) .9 9.3.4 Multilayer columns (obligatory) .10 9.3.5 Alumina column (optional) 11 9.4 Preparation of GC solution and GC procedure .11 9.5 Calculation and quantitation procedure. 10 Test report .14 Annex A (informative) Nomenclature of PCBs .15 Bibliography .21 @ IS0 2019 - All rights reserved ii