BS-ISO-17997-2-2004.pdf
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1、BRITISH STANDARD BS ISO 17997-2:2004 Milk Determination of casein-nitrogen content Part 2: Direct method ICS 67.100.10 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:36:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 17997-2:2004 This British Standard was published under the author
2、ity of the Standards Policy and Strategy Committee on 14 January 2005 BSI 14 January 2005 ISBN 0 580 45364 2 National foreword This British Standard reproduces verbatim ISO 17997-2:2004 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical
3、Committee AW/5, Milk and milk products, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in t
4、he BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible
5、 for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK
6、interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 7 and a back cover. The BSI copyright notice displayed
7、 in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:36:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference numbers ISO 17997-2:2004(E) IDF 29-2:2004(E) INTERNATIONAL NAT
8、SDRAD ISO 179972- FDI 92-2 tide tsriFino 0-400251-9 Milk Determination of casein-nitrogen content Part 2: Direct method Lait Dtermination de la teneur en azote de casine Partie 1: Mthode directe Referecne unbmers OSI -7997102:2)E(40 DI:2-92 F002)E(4 OSI DI dnaF 4002 INTERNATIONAL STANDARD ISO 17997-
9、2 IDF 29-2 First edition 2004-09-15 eD kliMimretnitao nof sacnie-rtinegon tnoctne :2 traP tem tceriDdoh tiaL D retmanitoid ne la enetru ne azeto c edaseni raPtie :1 Mtdohd eirecte BS ISO 179972:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:36:23 GMT+00:00 2006, Uncontrolled Copy, (c
10、) BSI ii BS ISO 179972:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:36:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepari
11、ng 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 lia
12、ison 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
13、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
14、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 17997-2IDF 29-2 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk
15、 products, and the International Dairy Federation (IDF), in collaboration with AOAC International. It is being published jointly by ISO and IDF and separately by AOAC International. ISO 17997IDF 29 consists of the following parts, under the general title Milk Determination of casein- nitrogen conten
16、t: Part 1: Indirect method (Reference method) Part 2: Direct method BS ISO 179972:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:36:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv Foreword IDF (the International Dairy Federation) is a worldwide federation of the dairy sector with a
17、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 and AOAC International in the development of standard methods of analysis and sampling for milk and milk prod
18、ucts. 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 IDF National Committees casting a vote. ISO 17797-2IDF 29-2 was prepared by Tech
19、nical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF), in collaboration with AOAC International. It is being published jointly by ISO and IDF and separately by AOAC International. All work was carried out by the Joint ISO/ID
20、F/AOAC Action Team on Nitrogen compounds, of the Standing Committee on Main components in milk. This first edition of ISO 17997-2IDF 29-2, together with ISO 17997-1IDF 29-1, cancels and replaces the first edition of IDF 29:1964, which has been technically revised. ISO 17997IDF 29 consists of the fol
21、lowing parts, under the general title Milk Determination of casein- nitrogen content: Part 1: Indirect method (Reference method) Part 2: Direct method BS ISO 179972:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:36:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Introduction This par
22、t of ISO 17997IDF 29 specifies a routine method for the direct determination of the casein-nitrogen content of milk. The method was developed and optimized to provide results that agree well with results of the method described in ISO 17997-1IDF 29-1 when both are applied to fresh raw bovine milk. N
23、o collaborative study data were available for this method when publishing its equivalent, IDF 29:1964. Recent research has been completed to develop the better defined indirect reference method given in ISO 17997-1IDF 29-1, and this routine method for the direct measurement of the casein-nitrogen co
24、ntent of milk. Both methods have been collaboratively studied and a reference to the obtained precision data is included in each part. BS ISO 179972:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:36:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffi
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