ISO INTERNATIONAL STANDARD 14673-3 IDF 189-3 Second edition 2004-02-01 Milk and milk products Determination of nitrate and nitrite contents - Part 3: Method using cadmium reduction and flow injection analysis with in-line dialysis (Routine method) Lait et produits laitiers Détermination des teneurs en nitrates et en nitrites- Partie 3: Méthode par réduction au cadmium et d'analyse par injection deflux avec dialyse en ligne (Methode de routine) Reference numbers ISO 14673-3:2004(E) IDF 189-3:2004(E) @ ISO and IDF 2004 CopyrightInternational Organization for Standardization Not for Re: ISO 14673-3:2004(E) IDF189-3:2004(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's 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 performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. Neither the ISo Central Secretariat nor the IDF accepts any liability in this area. Adobe is a trademark 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 and IDF national committees. In the unlikely event that a problem relating to it is found, please inform the ISO Central Secretariat at the address given below. @ ISO and IDF 2004 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, address below. ISO copyright office International DairyFederation Case postale 56. CH-1211 Geneva 20 Diamant Building ·Boulevard Auguste Reyers 80.B-1030 Brussels Tel. + 41 22 749 01 11 Tel. + 32 2 733 98 88 Fax + 41 22 749 09 47 Fax + 32 2 733 04 13 E-mail [email protected] E-mail [email protected] Web www.iso.org Web www.fil-idf.org Published in Switzerland yheatinaganzainfandardizatio @ ISO and IDF2004-All rights reserved Not for Resale ISO 14673-3:2004(E) IDF 189-3:2004(E) Contents Page Foreword 1 Scope 2 Normative references 3 Terms and definitions. 4 Principle 5 Reagents 6 Apparatus 7 Sampling . 8 Preparation of test sample.... 8.1 Cheese... 9 Procedure... 9.1 Checking the reducing capacity of the cadmium column. 9.2 Regeneration of the cadmium column...... 9.3 Testportion 9.4 Extraction.... 9.5 Determination of nitrite content 9.6 Determination of nitrate content ... 10 Calculation and expression of results. 10.1 Nitrite content 10.2 Nitrate content. 11 Precision 11.1 11.2 Nitrite content 11.3 Nitrate content. 12 Test report. Bibliography 10 ii se from IHS Not for Resal ISO 14673-3:2004(E) IDF 189-3:2004(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards ISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehas 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. InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/lECDirectives,Part2 The main task of technical committees is to prepare International Standards. Draft International Standards adoptedbythetechnicalcommitteesarecirculatedtothememberbodiesforvoting.Publicationasan International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some 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_14673-31IDF 189-3 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF),