ISO INTERNATIONAL STANDARD 6975 Second edition 1997-04-01 Natural gas Extended analysis Gas-chromatographic method Gaz naturel Analyse étendue - Methode par chromatographie enphasegazeuse Reference number ISO 6975:1997(E) HS unde permitted without license from IHS Not for Resale ISO 6975:1997(E) Contents Page Scope 1 2 Normative references 2 Definitions 3 Principle 4 5 Analysis and analytical requirements 5 6 Procedures 7 7 Calibration and control charts 8 Calculations 11 Precision 13 10 Test report 14 Annexes A Determination of the response curves for the main components inasample 15 B Further details on the matrices used in annex A 21 c List of retention indices 22 D Bibliography 24 @1SO1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Internationai Organization forStandardization Case postale 56. CH-1211 Geneve 20. Switzerland internet [email protected] X.400 C=ch; a=40Onet; p=iso; o=isocs; S=central Printed in Switzeriand Copyright International Organizationfor Standardization se from IHS Not for Resale @ ISO ISO6975:1997(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard isO 6975 was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis of natural gas. This second edition cancels and replaces the first edition (ISO 6975:1986), which has been technically revised. Annexes A to D of this International Standard are for information only Cropydiah lnteraioal organzainforStandardization ili e from IHS Not for Resale