All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher. B lack carbon produced by incomplete combustion of fossil fuels and biomass, is a ubiquitous form of ROM widely distributed in the environment. There is no a unique structure accepted for this complex material. Heidenreich et al. (1968) reported for the fi rst time the "onion-like" concentric microtexture of "carbon black." In general, it is accepted that black carbon consists of complex polyaromatic condensed structures

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8Polyethylene is probably the most used plastic material in daily life and its accurate analysis is 9 of importance. In this communication the chemical structure of polyethylenes is studied in 10 detail using conventional analytical pyrolysis (Py-GC/MS), bulk stable isotopic analysis (IRMS) 11 and pyrolysis compound specific stable isotopic analysis (Py-CSIA) to measure stable isotope 12 proportions (δ reported. To the best of our knowledge this is the first application Py-CSIA to the study of a 21 synthetic polymer. This hyphenated analytical technique is a promising tool to study synthetic 22 materials, providing not only a fingerprinting, but also allowing the traceability of the 23 polymerization process and the origin of the materials. 24 25