BS-684-2.14-1998 ISO-3960-1998.pdf
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1、BRITISH STANDARD BS 684-2.14:1998 ISO 3960:1998 Methods of analysis of fats and fatty oils Part 2: Other methods Section 2.14: Determination of peroxide value ICS 67.200.10 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:02:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 684-2.14:1998 Thi
2、s British Standard, having been prepared under the direction of the Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 October 1998 BSI 05-1999 ISBN 0 580 30421 3 National foreword This British Standard reproduces verbati
3、m ISO 3960:1998 and implements it as the UK national standard. It supersedes BS 684-2.14:1987 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AW/11, Animal and vegetable fats and oils, which has the responsibility to: aid enquirers to understand the t
4、ext; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this commit
5、tee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by usi
6、ng the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity
7、 from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indica
8、ted in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:02:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 684-2.14:1998 BSI 05-1999i Contents Page National forewordInside front cover Fo
9、rewordiii 1Scope1 2Normative reference1 3Definition1 4Principle1 5Reagents1 6Apparatus2 7Sampling2 8Preparation of test sample2 9Procedure2 10Expression of results3 11Precision3 12Test report3 Annex A (informative) Results of interlaboratory tests4 Annex B (informative) Bibliography4 Table 1 Mass of
10、 test portion and accuracy of weighing2 Table A.1 Test on sunflowerseed oil4 Table A.2 Test on lard, tallow and beef fat4 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:02:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank ii Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:02:1
11、2 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:02:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 684-2.14:1998 ii BSI 05-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bo
12、dies (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 right to be represented on that committee. International organizatio
13、ns, 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. Draft International Standards adopted by the technical committees are circulat
14、ed to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 3960 was prepared by Technical Committee ISO/TC 34, Agricultural food products, Subcommittee SC 11, Animal and vegetable fat
15、s and oils. This second edition cancels and replaces the first edition (ISO 3960:1977), which has been technically revised. Annex A and Annex B of this International Standard are for information only. Descriptors: Agricultural products, food products, animal fats, vegetable fats, animal oils, vegeta
16、ble oils, chemical analysis, determination, peroxide number. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 14:02:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 684-2.14:1998 BSI 05-19991 1 Scope This International Standard specifies a method for the determination of the peroxide value of
17、animal and vegetable oils and fats. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication the edition indicated was valid. All standards are subject to revision, and par
18、ties to agreement based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 3696:1987, Water for analytical laborato
19、ry use Specification and test methods. 3 Definition For the purposes of this International Standard, the following definition applies. 3.1 peroxide value quantity of those substances in the sample, expressed in terms of active oxygen, which oxidize potassium iodide under the conditions specified in
20、this International Standard, divided by the mass of the test portion NOTE 1Peroxide value is expressed in millimoles per kilogram. NOTE 2Peroxide value is often expressed in industry as milliequivalents per kilogram. The value expressed in millimoles per kilogram is half that expressed in milliequiv
21、alents per kilogram (see clause 10). 4 Principle Treatment of a test portion, in solution in acetic acid and iso-octane, with a solution of potassium iodide. Titration of the liberated iodine with a standard volumetric sodium thiosulfate solution. 5 Reagents Use only reagents of recognised analytica
22、l grade, unless otherwise stated. All reagents and the water shall be free of dissolved oxygen. 5.1 Water, complying with grade 3 of ISO 3696. 5.2 Glacial acetic acid, freed from oxygen by purging with a current of pure and dry inert gas (carbon dioxide or nitrogen). WARNING: Glacial acetic acid is
23、moderately toxic by ingestation and inhalation. It is a strong irritant to skin and tissue. 5.3 Iso-octane, freed from oxygen by purging with a current of pure and dry inert gas (carbon dioxide or nitrogen). WARNING: Iso-octane is flammable and a fire risk. Explosive limits in air are 1,1 % (V/V) to
24、 6,0 % (V/V). It is toxic by ingestation and inhalation. A properly operating fume hood should be used when working with this solvent. 5.4 Acetic acid/iso-octane solution 60 : 40 (V/V), prepared by mixing 3 volumes of glacial acetic acid (5.2) with 2 volumes of iso-octane (5.3). 5.5 Potassium iodide
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