Dansk standard DS/EN ISO 5764 2. udgave 2009-05-20 Mælk Bestemmelse af frysepunkt Termistorkryoskopmetode (referencemetode) Milk Determination of freezing point Thermistor cryoscope method (Reference method)
DS/EN ISO 5764 København DS projekt: M224876 ICS: 67.100.10 Første del af denne publikations betegnelse er: DS/EN ISO, hvilket betyder, at det er en international standard, der har status både som europæisk og dansk standard. Denne publikations overensstemmelse er: IDT med: ISO 5764:2009. IDT med: EN ISO 5764:2009. DS-publikationen er på engelsk. Denne publikation erstatter: DS/EN ISO 5764:2002. DS-publikationstyper Dansk Standard udgiver forskellige publikationstyper. Typen på denne publikation fremgår af forsiden. Der kan være tale om: Dansk standard standard, der er udarbejdet på nationalt niveau, eller som er baseret på et andet lands nationale standard, eller standard, der er udarbejdet på internationalt og/eller europæisk niveau, og som har fået status som dansk standard DS-information publikation, der er udarbejdet på nationalt niveau, og som ikke har opnået status som standard, eller publikation, der er udarbejdet på internationalt og/eller europæisk niveau, og som ikke har fået status som standard, fx en teknisk rapport, eller europæisk præstandard DS-håndbog samling af standarder, eventuelt suppleret med informativt materiale DS-hæfte publikation med informativt materiale Til disse publikationstyper kan endvidere udgives tillæg og rettelsesblade DS-publikationsform Publikationstyperne udgives i forskellig form som henholdsvis fuldtekstpublikation (publikationen er trykt i sin helhed) godkendelsesblad (publikationen leveres i kopi med et trykt DS-omslag) elektronisk (publikationen leveres på et elektronisk medie) DS-betegnelse Alle DS-publikationers betegnelse begynder med DS efterfulgt af et eller flere præfikser og et nr., fx DS 383, DS/EN 5414 osv. Hvis der efter nr. er angivet et A eller Cor, betyder det, enten at det er et tillæg eller et rettelsesblad til hovedstandarden, eller at det er indført i hovedstandarden. DS-betegnelse angives på forsiden. Overensstemmelse med anden publikation: Overensstemmelse kan enten være IDT, EQV, NEQ eller MOD IDT: Når publikationen er identisk med en given publikation. EQV: Når publikationen teknisk er i overensstemmelse med en given publikation, men præsentationen er ændret. NEQ: Når publikationen teknisk eller præsentationsmæssigt ikke er i overensstemmelse med en given standard, men udarbejdet på baggrund af denne. MOD: Når publikationen er modificeret i forhold til en given publikation.
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 5764 May 2009 ICS 67.100.10 Supersedes EN ISO 5764:2002 English Version Milk - Determination of freezing point - Thermistor cryoscope method (Reference method) (ISO 5764:2009) Lait - Détermination du point de congélation - Méthode au cryoscope à thermistance (Méthode de référence) (ISO 5764:2009) This European Standard was approved by CEN on 13 April 2009. Milch - Bestimmung des Gefrierpunktes - Thermistor- Kryoskop-Verfahren (Referenzverfahren) (ISO 5764:2009) CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European 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 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 under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 5764:2009: E
EN ISO 5764:2009 (E) Contents Page Foreword...3 2
EN ISO 5764:2009 (E) Foreword This document (EN ISO 5764:2009) has been prepared by Technical Committee ISO/TC 34 "Agricultural 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 text or by endorsement, at the latest by November 2009, and conflicting national standards shall be withdrawn at the latest by November 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 5764:2002. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 5764:2009 has been approved by CEN as a EN ISO 5764:2009 without any modification. 3
INTERNATIONAL STANDARD ISO 5764 IDF 108 Third edition 2009-05-01 Milk Determination of freezing point Thermistor cryoscope method (Reference method) Lait Détermination du point de congélation Méthode au cryoscope à thermistance (Méthode de référence) Reference numbers ISO 5764:2009(E) IDF 108:2009(E) ISO and IDF 2009
ISO 5764:2009(E) IDF 108:2009(E) PDF disclaimer 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 parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies 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. COPYRIGHT PROTECTED DOCUMENT ISO and IDF 2009 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 or IDF at the respective address below. ISO copyright office International Dairy Federation 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 copyright@iso.org E-mail info@fil-idf.org Web www.iso.org Web www.fil-idf.org Published in Switzerland ii ISO and IDF 2009 All rights reserved
ISO 5764:2009(E) IDF 108:2009(E) Contents Page Foreword... iv Foreword... v 1 Scope...1 2 Normative references...1 3 Terms and definitions...1 4 Principle...2 5 Reagents...2 6 Apparatus...3 7 Sampling...4 8 Calibration of the thermistor cryoscope...4 9 Preparation of test sample...5 9.1 Preparation...5 9.2 Sample condition...6 10 Procedure...6 10.1 Preliminary checks...6 10.2 Routine calibration check...6 10.3 Determination...6 11 Calculation and expression of results...7 11.1 Calculation...7 11.2 Expression of results...7 12 Precision...7 12.1 Interlaboratory test...7 12.2 Repeatability...7 12.3 Reproducibility...7 13 Test report...8 Annex A (informative) Interlaboratory trial on bovine milk...9 Annex B (informative) Interlaboratory trial on raw ovine and caprine milk...11 Annex C (informative) Guidelines for the application of routine thermistor cryoscope methods...13 Annex D (informative) Adjustment of the freezing point value used as the reference for genuine milk...16 Bibliography...17 ISO and IDF 2009 All rights reserved iii
ISO 5764:2009(E) IDF 108:2009(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 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 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 prepare 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 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. International Standard ISO 5764 IDF 108 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF). It is being published jointly by ISO and IDF. This third edition of ISO 5764 IDF 108 cancels and replaces the second edition (ISO 5764 IDF 108:2002), the scope of which has been technically revised. iv ISO and IDF 2009 All rights reserved
ISO 5764:2009(E) IDF 108:2009(E) Foreword IDF (the International Dairy Federation) is a non-profit organization representing the dairy sector worldwide. IDF membership comprises National Committees in every member country as well as regional dairy associations having signed a formal agreement on cooperation with IDF. All members of IDF have the right to be represented on the IDF Standing Committees carrying out the technical work. IDF collaborates with ISO in the development of standard methods of analysis and sampling for milk and milk products. Draft International Standards adopted by the Action Teams and Standing Committees are circulated to the National Committees for voting. Publication as an International Standard requires approval by at least 50 % of 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. International Standard ISO 5764 IDF 108 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF). It is being published jointly by ISO and IDF. All work was carried out by the Joint IDF-ISO Action Team on Water, of the Standing Committee on Main components in milk, under the aegis of its project leader, Mrs. S. Orlandini (IT). This edition of ISO 5764 IDF 108 cancels and replaces ISO 5764 IDF 108:2002, the scope of which has been technically revised. ISO and IDF 2009 All rights reserved v
INTERNATIONAL STANDARD ISO 5764:2009(E) IDF 108:2009(E) Milk Determination of freezing point Thermistor cryoscope method (Reference method) 1 Scope This International Standard specifies a reference method for the determination of the freezing point of raw bovine milk, heat-treated whole, reduced fat and skimmed bovine milk, as well as raw ovine and caprine milk, by using a thermistor cryoscope. The freezing point can be used to estimate the proportion of extraneous water in milk. Calculation of the amount of extraneous water is subject to daily and seasonal variations, and is not within the scope of this International Standard. Results obtained from samples with a titratable acidity exceeding 20 ml of 0,1 mol/l sodium hydroxide solution per 10 g of non-fat solids are not representative of the original milk. NOTE 1 Sterilization and vacuum pasteurization can affect the freezing point of milk (see Reference [5]). NOTE 2 The method uses plateau-timed instruments. For routine measurements, other thermistor cryoscope methods, i.e. fixed time procedures, can be used. Guidelines for the application of other procedures are given in Annex C. NOTE 3 The limit value mentioned for the titratable acidity in Clause 1 and 9.2 applies to bovine milk. It is possible that the limit values for ovine and caprine milk are higher. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3696, Water for analytical laboratory use Specification and test methods ISO 6091, Dried milk Determination of titratable acidity (Reference method) 1) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 freezing point of milk temperature value obtained using the method specified in this International Standard NOTE The freezing point is expressed in millidegrees Celsius. 1) Equivalent to IDF 86. ISO and IDF 2009 All rights reserved 1