ISO INTERNATIONAL STANDARD 13759 First edition ANSI Internat Doc Sec 1996-12-15 Petroleum products - Determination of alkyl nitrate in diesel fuels Spectrometric method Produitspetroliers--Determinationdunitrated'alkyledansles carburants diesels-Methodespectrometrique ISO Reference number ISO13759:1996(E) ISO13759:1996(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 atechnical committeehas been establishedhasthe 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. circulated to the member bodies for voting. Publication as an Internationai a vote. International Standard ISO 13759 was prepared by Technical Committee ISO/TC28,Petroleumproductsandlubricants. AnnexAof thisInternationai Standard isforinformationonly ?ISO1996 All rightsreserved.Unless otherwise specified,nopartofthispublicationmaybe reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 .CH-1211 Geneve 20. Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ISO 13759:1996(E) INTERNATIONALSTANDARD ISO Petroleum products -- Determination of alkyl nitrate in diesel fuels Spectrometric method WARNING - The use of this International Standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Scope This International Standard specifies a procedure for the determination of alkyl nitrate in diesel fuel in the concentration range 0,03 % (V/M) to 0,30 % (V/M) (volume fraction 0,03 % to 0,30 %). A knowledge of the specific alkyl nitrate present in the diesel fuel is required for accurate determinations, as the calibration of instrumentation is reliant on reference solutions containing the nitrate to be analysed. When the specific alkyl nitrate is not known, a result comparative to a reference alkyl nitrate (4.2) gives indicative information. NOTE- The addition of certain alkyl nitrates to diesel fuel enhances the cetane number as measured by the engine test described in IsO 5165. It has no effect on the cetane index value as described in ISO 4264. See annex A. The presence of nitrate esters, inorganic nitrate ions and nitrogen oxides will interfere with this determination. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IsO 385-1:1984, Laboratory glassware --Burettes-Part 1: General requirements. IsO835-1:1981,Laboratoryglassware---Graduatedpipettes-Part1:Generalrequirements. IsO1042:1983,LaboratoryglasswareOne-markvolumetricflasks. IsO3696:1987,Waterforanalyticallaboratoryuse—Specificationandtestmethods.