ISO-10539-2002.pdf
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1、 Reference number ISO 10539:2002(E) ISO 2002 INTERNATIONAL STANDARD ISO 10539 First edition 2002-03-15 Animal and vegetable fats and oils Determination of alkalinity Corps gras dorigines animale et vgtale Dtermination de lalcalinit Copyright International Organization for Standardization Provided by
2、 IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 06:54:06 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10539:2002(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file
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5、 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. ISO 2002 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in a
6、ny 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 office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 7
7、49 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2002 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 06:54:06 MDTNo reproduction or networking per
8、mitted without license from IHS -,-,- ISO 10539:2002(E) ISO 2002 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
9、 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-governmental, in liaison with ISO, also take part in the work. ISO col
10、laborates 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 3. The main task of technical committees is to prepare International S
11、tandards. 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. Attention is drawn to the possibility that some of the elements
12、 of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 10539 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 11, Animal and vegetable fats and oils. Annex A of this Intern
13、ational Standard is for information only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 06:54:06 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Internationa
14、l Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 06:54:06 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 10539:2002(E) ISO 2002 All rights reserved 1 Animal and veg
15、etable fats and oils Determination of alkalinity 1 Scope This International Standard specifies a method for the determination of the alkalinity of animal and vegetable fats and oils without distinguishing between the various constituents. The method is not applicable to dry melted animal fats, nor t
16、o oils and fats with an acidity greater than 60 % (mass fraction) as determined in accordance with ISO 660. NOTE Fats and oils can contain alkaline constituents either naturally (e.g. calcium soaps from bones) or accidentally (e.g. sodium soaps in imperfectly refined fats and oils). 2 Normative refe
17、rences 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 agreements based on th
18、is 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 registers of currently va
19、lid International Standards. ISO 660:1996, Animal and vegetable fats and oils Determination of acid value and acidity ISO 661:1989, Animal and vegetable fats and oils Preparation of test sample ISO 3696:1987, Water for analytical laboratory use Specification and test methods 3 Term and definition Fo
20、r the purposes of this International Standard, the following term and definition apply. 3.1 alkalinity proportion of alkali in a fat or oil determined by titration with hydrochloric acid, in accordance with the method specified in this International Standard 4 Principle A test portion is dissolved i
21、n warm aqueous acetone and titrated with hydrochloric acid. 5 Reagents Use only reagents of recognized analytical grade, unless otherwise stated. 5.1 Water, conforming to grade 3 of ISO 3696. 5.2 Aqueous acetone Mix 970 ml of acetone, 20 ml of water and 10 ml of bromophenol blue solution (2 g/l in a
22、cetone). Add sodium hydroxide solution c(NaOH) = 0,1 mol/l to give a blue colour, then add hydrochloric acid c(HCl) = 0,1 mol/l until a yellowish green colour appears. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not fo
23、r Resale, 04/23/2007 06:54:06 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10539:2002(E) 2 ISO 2002 All rights reserved 5.3 Hydrochloric acid standard volumetric solution, c(HCl) = 0,01 mol/l, standardized not more than 7 days before use. 6 Apparatus Usual laboratory
24、 apparatus and, in particular, the following. 6.1 Borosilicate glass apparatus, for aqueous acetone (5.2). 6.2 Conical flasks, with wide necks, and of capacities 400 ml to 500 ml. 7 Sampling It is important that the laboratory receive a sample which is truly representative and has not been damaged o
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