ISO-20847-2004.pdf
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1、 Reference number ISO 20847:2004(E) ISO 2004 INTERNATIONAL STANDARD ISO 20847 First edition 2004-03-15 Petroleum products Determination of sulfur content of automotive fuels Energy-dispersive X-ray fluorescence spectrometry Produits ptroliers Dtermination de la teneur en soufre des carburants pour a
2、utomobiles Spectromtrie de fluorescence de rayons X dispersive en nergie Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 03:48:46 MDTNo reproduction or networking permitted witho
3、ut license from IHS -,-,- ISO 20847:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer perfor
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6、cretariat at the address given below. ISO 2004 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
7、address below or ISOs 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 copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2004 All rights reserved Copyright International Organization
8、 for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 03:48:46 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20847:2004(E) ISO 2004 All rights reserved iii Contents Page Forewordiv Introdu
9、ction v 1 Scope1 2 Normative references .1 3 Principle.1 4 Reagents and materials2 5 Apparatus.2 6 Sampling and sample handling.3 7 Apparatus preparation3 8 Calibration4 9 Procedure.6 10 Calculation.6 11 Expression of results6 12 Precision6 13 Test report7 Annex A (informative) Interferences.8 Annex
10、 B (informative) Guidelines for measuring low sulfur contents (less than 100 mg/kg)10 Bibliography .11 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 03:48:46 MDTNo reproduction
11、 or networking permitted without license from IHS -,-,- ISO 20847:2004(E) iv ISO 2004 All rights reserved 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 nor
12、mally 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
13、the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepar
14、e International Standards. 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. Attention is drawn to the possibility that som
15、e of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 20847 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants. Copyright International Organization for Standardizatio
16、n Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 03:48:46 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20847:2004(E) ISO 2004 All rights reserved v Introduction This International Standard is directed
17、specifically at the lower end of the concentration range covered in ISO 8754 (3 in the Bibliography), which covers sulfur contents from 0,01 % (m/m) up to 5,00 % (m/m). By restriction of instrument type, a better signal to background ratio for sulfur K emission is assured and by the use of matrix ma
18、tched calibration standards or other means of matrix corrections (as detailed below), the precision and accuracy of results for samples having varying C:H mass ratios and oxygen contents are improved. A knowledge of the general composition of the sample for analysis is advantageous in obtaining the
19、best test result. Where matrix matching is not used and where the C:H mass ratio of the test sample is known or can be determined, accuracy may be improved by the use of the equation given in A.2.2 to correct the result to the C:H mass ratio of the calibration standards, i.e. the reference diluent o
20、il (4.1). Some instruments include the capability for the separate measurement of scattered radiation from the X-ray tube, and notes for information are provided in A.2.3 on the use of this scattered radiation for compensation for matrix effects in the test sample. Copyright International Organizati
21、on for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 03:48:46 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under li
22、cense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 03:48:46 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 20847:2004(E) ISO 2004 All rights reserved 1 Petroleum products Determination of sulfur content of au
23、tomotive fuels Energy-dispersive X-ray fluorescence spectrometry WARNING The use of this International Standard may involve hazardous materials, operations and equipment. This International Standard does not purport to address all of the safety problems associated with its use. It is the responsibil
24、ity of the user of this International Standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies an energy dispersive X-ray fluorescence (EDXRF) test method for the determination
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