ISO-10632-2000.pdf
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1、Reference number ISO 10632:2000(E) ISO 2000 INTERNATIONAL STANDARD ISO 10632 First edition 2000-06-01 Oilseed residues Simultaneous determination of oil and water contents Method using pulsed nuclear magnetic resonance spectroscopy Tourteaux de graines olagineuses Dtermination simultane de la teneur
2、 en huile et en eau Mthode par rsonance magntique nuclaire pulse ISO 10632:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed
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5、 is found, please inform the Central Secretariat at the address given below. ISO 2000 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 permis
6、sion in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 ? CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 734 10 79 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2000 All rights reserved
7、 ISO 10632:2000(E) ISO 2000 All rights reservediii 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. Eac
8、h 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 with the Internation
9、al 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 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for
10、 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 International Standard may be the subject of patent rights. ISO shall not be held responsible for identify
11、ing any or all such patent rights. International Standard ISO 10632 was prepared by Technical Committee ISO/TC 34,Agricultural food products, Subcommittee SC 2,Oleaginous seeds and fruits. Annex A of this International Standard is for information only. ISO 10632:2000(E) iv ISO 2000 All rights reserv
12、ed Introduction The method specified in this International Standard has been subjected to an international ring test. However, no precision data have been calculated because of an insufficient number of participating laboratories. See clause 11 and annex A. INTERNATIONAL STANDARDISO 10632:2000(E) IS
13、O 2000 All rights reserved1 Oilseed residues Simultaneous determination of oil and water contents Method using pulsed nuclear magnetic resonance spectroscopy 1Scope This International Standard specifies a rapid method using nuclear magnetic resonance (NMR) for the determination of the oil and water
14、contents of oilseed residues obtained after oil extraction by pressure or solvents (excluding mixed products). It is applicable to oilseed residues as flour, plates or agglomerates, provided that the particles are smaller than 2 mm and that the water content is not higher than the conversion thresho
15、ld. 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agr
16、eements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain regist
17、ers of currently valid International Standards. ISO 734-1,Oilseed residues Determination of oil content Part 1: Extraction method with hexane (or light petroleum). ISO 734-2,Oilseed residues Determination of oil content Part 2: Rapid extraction method. ISO 771,Oilseed residues Determination of moist
18、ure and volatile matter content. ISO 5502,Oilseed residues Preparation of test samples. 3Principle The test sample is placed in the magnetic field of a pulsed NMR spectrometer. An alternating electromagnetic field is applied in the form of an intense 90 radiofrequency (RF) pulse which excites all th
19、e hydrogen nuclei. The free induction decay (FID) is recorded following the 90 pulse. The maximum amplitude of this signal is proportional to the total number of protons from the water and oil phases of the sample. A second RF pulse, a so-called 180 pulse, is then applied to produce a spin-echo sign
20、al when only the signal from the oil phase contributes to the FID. NOTE 1The maximum amplitude of this echo signal is proportional to the oil content. It varies with the sample temperature following a complex law. An increase in temperature decreases the measured value of the echo. The difference be
21、tween the two amplitudes, which is proportional to the water content, is calculated. -,-,- ISO 10632:2000(E) 2 ISO 2000 All rights reserved After suitable calibration of the apparatus, the measured signals are automatically converted into percentages of oil or water. NOTE 2Simultaneous indications o
22、f the oil and water contents can be given by some spectrometers equipped with a minicomputer and specific program. 4Calibration samples 4.1General Calibration samples shall be homogeneous and free from impurities. 4.2Samples for moisture-content calibration The water content of oilseed residues can
23、vary depending on storage conditions. It is therefore necessary to determine this just prior to calibration in accordance with ISO 771. 4.3Samples for oil-content calibration Samples from oilseed residues shall be of the same species as the test samples and of similar fatty acid compositions (especi
24、ally for the analysis of rapeseeds which are rich in erucic acid, and for sunflower seeds which are rich in oleic acid). Oil content shall be determined using the reference method described in ISO 734-1. 5Apparatus Usual laboratory apparatus and, in particular, the following. 5.1Pulsed low-resolutio
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