ISO-1738-2004.pdf
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1、 Reference numbers ISO 1738:2004(E) IDF 12:2004(E) ISO and IDF 2004 INTERNATIONAL STANDARD ISO 1738 IDF 12 Third edition 2004-10-15 Butter Determination of salt content Beurre Dtermination de la teneur en sel -,-,- ISO 1738:2004(E) IDF 12:2004(E) PDF disclaimer This PDF file may contain embedded typ
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4、n 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. ISO an
5、d IDF 2004 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
6、 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 copyrightiso.org E-mail infofil-idf.org Web www.iso.org Web w
7、ww.fil-idf.org Published in Switzerland ii ISO and IDF 2004 All rights reserved ISO 1738:2004(E) IDF 12:2004(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 w
8、ork 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-govern
9、mental, 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
10、 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.
11、 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. ISO 1738IDF 12 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk
12、 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. This edition of ISO 1738IDF 12 cancels and replaces ISO 1738:1997, of which it constitutes a minor revision.
13、ISO 1738:2004(E) IDF 12:2004(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 Comm
14、ittees 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 products. Draft International Standards adopted by the Action Teams and Standing Committees are circulated to the National Commit
15、tees for voting. Publication as an International Standard requires approval by at least 50 % of the National Committees casting a vote. ISO 1738IDF 12 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF)
16、, 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/IDF/AOAC Group of Experts on Minerals and minor compounds (E602), under the aegis of its chairman, Mr G. Brthen (NO). This edition
17、of ISO 1738IDF 12 cancels and replaces IDF 12C:2000, of which it constitutes a minor revision. INTERNATIONAL STANDARD ISO 1738:2004(E) IDF 12:2004(E) ISO and IDF 2004 All rights reserved 1 Butter Determination of salt content 1 Scope This International Standard specifies a method for the determinati
18、on of the salt content of butter. The method is applicable to all types of butter containing more than 0,1 % (mass fraction) of salt. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies
19、. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 385-1:1984, Laboratory glassware Burettes Part 1: General requirements ISO 648, Laboratory glassware One-mark pipettes ISO 4788, Laboratory glassware Graduated measuring cylinders 3 Terms
20、and definitions For the purposes of this document, the following terms and definitions apply. 3.1 salt content mass fraction of substances determined by the method specified in this International Standard NOTE It is expressed as the equivalent content of sodium chloride as a mass fraction in percent
21、. 4 Principle A test portion of butter is melted by adding boiling water. The dissolved chlorides in the mixture are titrated with a solution of silver nitrate, using potassium chromate as indicator (the Mohr procedure). 5 Reagents Use only reagents of recognized analytical grade, unless otherwise s
22、pecified, and distilled or demineralized water or water of equivalent purity, free from chlorides. 5.1 Silver nitrate standard volumetric solution (AgNO3), of known concentration in the range 0,08 mol/l to 0,10 mol/l. Dissolve an amount of between 13,6 g to 20,4 g of silver nitrate in water which is
23、 practically free from carbon dioxide in a 1 000 ml volumetric flask. Dilute to the mark with water. Calibrate the silver nitrate solution against 100 ml of a solution containing 0,400 g/l of sodium chloride (NaCl), which has previously been dried at 300 C, -,-,- ISO 1738:2004(E) IDF 12:2004(E) 2 IS
24、O and IDF 2004 All rights reserved following the procedure specified in 9.3.2 and 9.4. Express the concentration of the silver nitrate solution in moles per litre to four decimals. Store the solution away from direct sunlight. NOTE If a solution containing 14,53 g/l (0,085 5 mol/l) of silver nitrate
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