ISO-15648-2004.pdf
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1、 Reference numbers ISO 15648:2004(E) IDF 179:2004(E) ISO and IDF 2004 INTERNATIONAL STANDARD ISO 15648 IDF 179 First edition 2004-08-15 Butter Determination of salt content Potentiometric method Beurre Dtermination de la teneur en sel Mthode potentiomtrique Copyright International Organization for S
2、tandardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 02:51:47 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15648:2004(E) IDF 179:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordan
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4、sing 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 o
5、ptimized 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. ISO and IDF 2004 All righ
6、ts 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 I
7、nternational 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 copyrightiso.org E-mail infofil-idf.org Web www.iso.org Web www.fil-idf.org Publ
8、ished in Switzerland ii ISO and IDF 2004 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 02:51:47 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO
9、 15648:2004(E) IDF 179:2004(E) ISO and IDF 2004 All rights reserved iii 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 tech
10、nical 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
11、 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. Draft International Standards adopted by the technical committees are circulated to
12、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 i
13、dentifying any or all such patent rights. ISO 15648|IDF 179 was prepared by Technical 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 an
14、d separately by AOAC International. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 02:51:47 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 15648:2004(E) IDF 179:20
15、04(E) iv ISO and IDF 2004 All rights reserved 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 te
16、chnical work. IDF collaborates with ISO and AOAC International 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. Publicati
17、on as an International Standard requires approval by at least 50% of IDF National Committees casting a vote. ISO 15648|IDF 179 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF), in collaboration with
18、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/IDF/AOAC Action Team on Minor compounds, of the Standing Committee on Minor components and characterization of physical properties, under the aegis of its
19、project leader, Mr G. Brthen (NO). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 02:51:47 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 15
20、648:2004(E) IDF 179:2004(E) ISO and IDF 2004 All rights reserved 1 Butter Determination of salt content Potentiometric method 1 Scope This International Standard specifies a method for the determination of the salt content of all types of butter containing more than 0,1 % (mass fraction) salt. NOTE
21、If the method is used for the analysis of butter with a low salt content, the expected relative precision figure will be higher than for salted butter; see also Reference 4. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 salt content of butt
22、er mass fraction of substances determined by the procedure specified in this International Standard NOTE The salt content, being the equivalent of sodium chloride, is expressed in percent by mass. 3 Principle A test portion is suspended in water. Chloride ions are titrated potentiometrically with a
23、standard volumetric solution of silver nitrate. 4 Reagents Use only reagents of recognized analytical grade, unless otherwise specified, and distilled or demineralized water free from chloride, or water of equivalent purity. 4.1 Silver nitrate, standard volumetric solution, of concentration in the r
24、ange of c(AgNO3) = 0,08 mol/l to 0,12 mol/l. Dissolve 13,6 g to 20,4 g of silver nitrate in water which is practically free from carbon dioxide. Dilute to 1 000 ml. Standardize the silver nitrate standard volumetric solution against sodium chloride (NaCl), previously dried at 300 C for 2 h. Express
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