ISO INTERNATIONAL STANDARD 17494 First edition 2001-10-01 Aromatic extracts, flavouring and perfuming compounds Determination of ethanol content Gas chromatographic method on packed and capillary columns Extraits aromatiques et compositions aromatisantes et parfumantes Détermination de la teneur en éthanol Methode par chromatographie en phasegazeusesurcolonneremplieetsurcolonnecapillaire Reference number ISO 17494:2001(E) So @ ISO 2001 ISO 17494:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is atrademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. @ISO2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyright@iso.ch Web www.iso.ch Printed in Switzerland @ ISO 2001 - All rights reserved ISO 17494:2001(E) Contents Page Foreword. IV Introduction 1 Scope 2 Normativereferences.. 3 Term and definition 4 Principle 5 Reagents 6 Apparatu 7 Operating conditions.. 7.1 Temperature. 7.2 Flow rates of carrier gas and auxiliary gases. 8 Column performances.. 8.1 Chemical inertness test 8.2 Column efficiency .... 9 Internal standard method.... 9.1 Determination of the response factor. 9.2 Determination of ethanol in the sample.. 10 Expression of results .. 11 Precision... 11.1 Interlaboratory test 11.2 Repeatability 11.3 Reproducibility 12 Test report. Annex A (informative) Typical chromatograms Annex B (informative) Results of an interlaboratory test on apricot, banana and orange flavours and on a wine lees essential oil.... nserved ili