BS EN ISO 8968-1:2014 BSl Standards Publication Milk and milk products - Determination of nitrogen content Part 1: Kjeldahl principle and crude protein calculation bsi. ..making excellence a habit BS ENISO 8968-1:2014 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN ISO BS EN ISO 8968-1:2002 and DD ISO/TS 17837:2008, which are withdrawn. 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. @ The British Standards Institution 2014. Published by BSI Standards Limited 2014 ISBN9780580778391 ICS67.100.10 Compliance witha British Standard cannot confer immunity from legal obligations. ThisBritishStandardwaspublishedundertheauthorityof the Standards Policy and Strategy Committee on28February2014. Amendments/corrigenda issued since publication Date Textaffected EN ISO8968-1 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHENORM February 2014 ICS 67.100.10 Supersedes EN ISO 8968-1:2001, EN ISO 8968-2:2001 English Version Milk and milk products - Determination of nitrogen content - Part 1:Kjeldahlprinciple and crude protein calculation (iSO 8968 1:2014) Lait et produits laitiers - Determination de la teneur en azote Milch und Milcherzeugnisse - Bestimmung des - Partie 1: Methode Kjeldahl et calcul de la teneur en Stickstoffgehaltes - Teil 1: Kjeldahl-Verfahren und proteines brutes (ISO 8968-1:2014) Berechnung des Rohproteingehaltes (ISO 8968-1:2014) This European Standard was approved by CEN on 18 January 2014. Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Siovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEE FUR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix17, B-1000 Brussels @2014CEN Ref. No. EN ISO 8968-1:2014 E worldwide for CEN national Members. BS EN ISO 8968-1:2014 EN ISO 8968-1:2014 (E) Foreword This document (EN ISO 8968-1:2014) has been prepared by Technical Committee ISO/TC 34 “"Food products” in collaboration with Technical Committee CEN/TC 302 “Milk and milk products - Methods of sampling and analysis" the secretariat of which is held by NEN. This European Standard shall be given the status of a national standard, either by publication of an identical the latest by August 2014. rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 8968-1:2001, ENISO 8968-2:2001. countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Hungary,Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg,Malta, Netherlands, Norway, Poland, Portugal Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom Endorsementnotice BS EN ISO 8968-1:2014 IS08968-1:2014(E) IDF20-1:2014(E) Contents Page Forewords .V 1 Scope .1 2 Normative references. .1 3 Terms and definitions .1 Principle .2 4 5 Reagents. .2 6 Apparatus. .3 7 Sampling. .5 8 Preparationoftest sample 5 8.1 Whole, partially skimmed or skimmed liquid milk 5 8.2 Hard, semi-hard and processed cheese 5 8.3 Dried milk and dried mil