ISO-2171-2007.pdf
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1、 Reference number ISO 2171:2007(E) ISO 2007 INTERNATIONAL STANDARD ISO 2171 Fourth edition 2007-11-01 Cereals, pulses and by-products Determination of ash yield by incineration Crales, lgumineuses et produits drivs Dosage du taux de cendres par incinration Copyright International Organization for St
2、andardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 11/19/2007 05:37:50 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 2171:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In acc
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5、nting. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2007 All rights reserved. Unless otherwi
6、se 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 at the address below or ISOs member body in the country of the requester. ISO copyright o
7、ffice Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees
8、/1111111001, User=Wing, Bernie Not for Resale, 11/19/2007 05:37:50 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 2171:2007(E) ISO 2007 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 1 4 Principle. 2 5 R
9、eagents 2 6 Apparatus 2 7 Sampling 3 8 Preparation of the test sample 3 9 Procedure 3 9.1 Determination of the moisture content. 3 9.2 Preparation of the ashing dishes 3 9.3 Preparation of the test portion 4 9.4 Pre-ashing . 4 9.5 Ashing 4 9.6 Number of determinations. 4 10 Expression of results . 4
10、 11 Precision 5 11.1 Interlaboratory tests. 5 11.2 Repeatability 5 11.3 Reproducibility 5 11.4 Critical difference 6 11.5 Uncertainty 6 12 Test report . 6 Annex A (informative) Results of interlaboratory tests 8 Annex B (informative) Practical application of repeatability and reproducibility limits
11、. 10 Bibliography. 11 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 11/19/2007 05:37:50 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 2171:2007(E) iv
12、 ISO 2007 All rights reserved 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 interes
13、ted 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 C
14、ommission (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 tech
15、nical 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
16、shall not be held responsible for identifying any or all such patent rights. ISO 2171 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 4, Cereals and pulses. This fourth edition cancels and replaces the third edition (ISO 2171:1993), which has been technically revised. C
17、opyright International Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 11/19/2007 05:37:50 MSTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 2171:2007(E) IS
18、O 2007 All rights reserved 1 Cereals, pulses and by-products Determination of ash yield by incineration 1 Scope This International Standard specifies a method for determining the ash yielded by cereals, pulses and their milled products intended for human consumption. The source materials covered are
19、: a) grains of cereals; b) flours and semolinas; c) milled products (bran and high bran content products, sharps); d) mixed cereal flours (mixes); e) cereal by-products other than milled products; and f) pulses and their by-products. This International Standard is not applicable to starches and star
20、ch derivatives (see ISO 3593), to products intended for animal feeding stuffs (see ISO 5984), or to seeds. 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, t
21、he latest edition of the referenced document (including any amendments) applies. ISO 712, Cereals and cereal products Determination of moisture content Routine reference method ISO 6540, Maize Determination of moisture content (on milled grains and on whole grains) ISO 24557:1), Pulses Determination
22、 of moisture content Air-oven method 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 ash incombustible residue obtained after incineration according to the method given in this International Standard 1) To be published. Copyright Internationa
23、l Organization for Standardization Provided by IHS under license with ISO Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 11/19/2007 05:37:50 MSTNo reproduction or networking permitted without license from IHS -,-,- ISO 2171:2007(E) 2 ISO 2007 All rights reserved 4 Principle A t
24、est portion is incinerated until combustion of organic matter is complete, then the residue obtained is weighed. The residue obtained is flaky after incineration at 550 C and vitrified after incineration at 900 C. In general, products containing salts (e.g. sodium chloride, pyrophosphate) shall be i
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