ISO-14673-3-2004.pdf
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1、 Reference numbers ISO 14673-3:2004(E) IDF 189-3:2004(E) ISO and IDF 2004 INTERNATIONAL STANDARD ISO 14673-3 IDF 189-3 Second edition 2004-02-01 Milk and milk products Determination of nitrate and nitrite contents Part 3: Method using cadmium reduction and flow injection analysis with in-line dialys
2、is (Routine method) Lait et produits laitiers Dtermination des teneurs en nitrates et en nitrites Partie 3: Mthode par rduction au cadmium et danalyse par injection de flux avec dialyse en ligne (Mthode de routine) ISO 14673-3:2004(E) IDF 189-3:2004(E) PDF disclaimer This PDF file may contain embedd
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5、reation 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.
6、ISO and 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 belo
7、w. 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 copyrightiso.org E-mail infofil-idf.org Web www.iso.org
8、 Web www.fil-idf.org Published in Switzerland ii ISO and IDF 2004 All rights reserved ISO 14673-3:2004(E) IDF 189-3:2004(E) ISO and IDF 2004 All rights reserved iii Contents Page Forewordiv 1 Scope1 2 Normative references .1 3 Terms and definitions.1 4 Principle.2 5 Reagents2 6 Apparatus.3 7 Samplin
9、g5 8 Preparation of test sample.5 8.1 Cheese5 9 Procedure.6 9.1 Checking the reducing capacity of the cadmium column6 9.2 Regeneration of the cadmium column6 9.3 Test portion .6 9.4 Extraction.6 9.5 Determination of nitrite content 7 9.6 Determination of nitrate content .7 10 Calculation and express
10、ion of results7 10.1 Nitrite content7 10.2 Nitrate content.8 11 Precision8 11.1 General.8 11.2 Nitrite content8 11.3 Nitrate content.9 12 Test report9 Bibliography .10 -,-,- ISO 14673-3:2004(E) IDF 189-3:2004(E) iv ISO and IDF 2004 All rights reserved Foreword ISO (the International Organization for
11、 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
12、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. Internatio
13、nal 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 a
14、s 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. I
15、SO 14673-3IDF 189-3 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 and separately by AOAC International. This
16、 second edition cancels and replaces the first edition (ISO 14673-3IDF 189-3:2001), of which it constitutes a minor revision. ISO 14673IDF 189 consists of the following parts, under the general title Milk and milk products Determination of nitrate and nitrite contents: Part 1: Method using cadmium r
17、eduction and spectrometry Part 2: Method using segmented flow analysis (Routine method) Part 3: Method using cadmium reduction and flow injection analysis with in-line dialysis (Routine method) -,-,- ISO 14673-3:2004(E) IDF 189-3:2004(E) ISO and IDF 2004 All rights reserved v Foreword IDF (the Inter
18、national 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 technical work. IDF collaborates with ISO and AOAC International in the
19、 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
20、 the National Committees casting a vote. ISO 14673-3IDF 189-3 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
21、and separately by AOAC International. All work was carried out by the Joint ISO/IDF/AOAC Action Team, Minerals and minor compounds, of the Standing Committee on Minor components characterization of physical properties, under the aegis of its project leader, Mr G. Brthen (NO). This second edition, to
22、gether with ISO 14673-1IDF 189-1 and ISO 14673-2IDF 189-2, cancels and replaces IDF 84A:1984, IDF 95A:1982, IDF 96A:1987, IDF 97A:1985 and IDF 120:1984, which have been technically revised. -,-,- -,-,- INTERNATIONAL STANDARD ISO 14673-3:2004(E) IDF 189-3:2004(E) ISO and IDF 2004 All rights reserved
23、1 Milk and milk products Determination of nitrate and nitrite contents Part 3: Method using cadmium reduction and flow injection analysis with in-line dialysis (Routine method) WARNING The use of this International Standard may involve hazardous materials, operations and equipment. This standard doe
24、s not purport to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish safety and health practices and determine the applicability of regulatory limitations prior to use. 1 Scope This part of ISO 14673IDF 189 specifies a routine m
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