BS ISO BRITISH STANDARD 3976:2006 Milk fat Determination of peroxide value ICS 67.100.10 BSi NO COPYINGWITHOUT BSIPERMISSIONEXCEPTASPERMITTED BY COPYRIGHTLAW British Standards BS ISO 3976:2006 National foreword This British Standard is the UK implementation of ISO 3976:2006. The UK participation in its preparation was entrusted to Technical Committee AW/5, Chemical analysis of milk and milk products. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was Amendments/corrigendaissued sincepublication published under the authority of the Standards Policy and Date Comments Strategy Committee on30June2008 @ BSI 2008 ISBN 978 0 580542992 BSIS0 3976:2006 ISO INTERNATIONAL 3976 STANDARD IDF 74 Second edition 2006-03-01 Milk fat Determination of peroxide value Matieregrasse laitiere-Determinationde I'indicedeperoxyde Reference numbers ISO 3976:2006(E) IDF 74:2006(E) i BSISO 3976:2006 Contents Page Foreword 1 Scope 2 Terms and definitions 3 Principle 4 Reagents 5 Apparatus 6 Sampling. 7 Preparation oftest sample.... 7.1 General... 7.2 Anhydrous milk fat, anhydrous butteroil, butteroil, ghee, 7.3 8 Procedure(seeAnnexA) 8.1 Precautions toavoid oxidation and disturbed recording ofextinctiol 8.2 Reagent blank. 8.3 Test sample blank. 8.4 Test portion... 8.5 Extinction coefficientofthered iron(lll)complex 9 Calculationand expression of results. 9.1 Calculation.... 9.2 Expressionoftestresults. 10 Precision.. 10.1 Interlaboratory test 10.2 Repeatability. 10.3 Reproducibility... 11 Test report AnnexA(informative)Summaryoftheprocedureandexamplesofcalculations.. AnnexB (informative)Interlaboratorytrial... .9 Annex C (informative) Comparison trial... 10 Bibliography. 13 ili BSIS03976:2006 Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards 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 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 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. ISO3976liDF74 was prepared byTechnical Committee ISO/TC 34,Food products,Subcommittee SC 5 IDF. This edition of ISO 3976liDF74 cancels and replaces ISO 3976:1977, which has been technically revised.A comparison of the results using the new reagent (methanol/1-decanol/n-hexane mixture) with those found using chloroform/methanol is given in Annex C. iv BSIS0 3976:2006 Foreword IDF (the International Dairy Federation) is a worldwide federation of the dairy sector with a National Committee in every member country. Every National Committee has the right to be represented on the IDF Standing Committees carrying out the technical work. IDF collaborates with ISO in the development of Draft International Standards adopted by the Action Teams and Standing Committees are circulated to the the IDF National Committees casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IDF shall not be held responsible for identifying any or all such patent rights. ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products. It is being published jointly by IDF and Iso. All work was carried out by the Joint ISO-IDF Action Team on