TECHNICAL ISO/TS SPECIFICATION 28581 First edition 2012-02-15 Water quality Determination of selected non-polar substances Method using gas chromatography with mass spectrometric detection (GC-MS) Qualite de I'eau Détermination de substances non polaires sélectionnées Méthode par chromatographie en phase gazeuse avec détectionpar spectrométrie de masse (CG-SM) Reference number ISO/TS 28581:2012(E) ISO Copyright intematioal Organizatin for Standardizatin @ISO2012 HS under n or networking permitted without license from IHS Not for Resale ISO/TS28581:2012(E) COPYRiGHTPROTECTEDDOCUMENT ISO2012 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 either ISO at the address below or ISO's member body 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 [email protected] Web www.iso.org Published in Switzerland @ ISO 2012 -All rights reserved or networking permited withoutlicense from IHS Not for Resale ISO/TS28581:2012(E) Contents Page Foreword ..iv Introduction 1 Scope. 2 Normative references 3 Terms and definitions. 4 Principle. 2 5 Interferences. 5.1 Interferences with sampling, extraction and concentration. 5.2 Interferences with gas chromatography .... 5 5.3 Interferences with Gc-MS. 6 6 Reagents. 6 7 Apparatus. .9 7.1 General requirements. 9 8 Sampling. 10 9 Procedure. 11 9.1 General considerations 11 9.2 Extraction... 11 9.3 Gas chromatography. 12 9.4 Blank measurement. 12 9.5 Mass spectrometric conditions 12 10 Calibration 13 10.1 General 13 10.2 Calibration by labelled internal standards 13 10.3 Calibration by internal standard. 13 11 Measurement of samples 14 12 Identification... .14 13 Calculation. 17 13.1 Quantification by internal standards 17 13.2 Quantification by labelled internal standards 18 13.3 Recoveryofinternalstandards 19 13.4 Concentration in the sample. 19 14 Expression of results, 19 15 Test report .20 Annex A (informative) Examples of GC-MS conditions... .21 Annex B (informative) Examples for the construction of special apparatus. .22 Annex C (informative) Silica clean-up... ..24 Bibliography. .25 ili ted without license from IHS Not for Resale