1、BRITISH STANDARD BS EN ISO 658:2002 Oilseeds Determination of content of impurities The European Standard EN ISO 658:2002 has the status of a British Standard ICS 67.200.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN ISO 658:2002 This British Standard, having been pre
2、pared under the direction of the Consumer Products and Services Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 23 May 2002 BSI 23 May 2002 ISBN 0 580 39104 3 National foreword This British Standard is the official English lan
3、guage version of EN ISO 658:2002. It is identical with ISO 658:2002. It supersedes BS EN ISO 658:1995 (also numbered BS 4289-2:1995) which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AW/307, Oilseeds, animal and vegetable fats and oils and their by-prod
4、ucts, which has the responsibility to: A list of organizations represented on this committee 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 Catal
5、ogue under the section entitled “International Standards Correspondence Index”, or by using 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 c
6、orrect application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests
7、informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 10, the Annex ZA page and a
8、back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO658 April2002 ICS67.200.20 SupersedesENISO658:1995 Englishversion OilseedsDetermina
9、tionofcontentofimpurities(ISO658:2002) GrainesolagineusesDterminationdelateneuren impurets(ISO658:2002) lsamenBestimmungdesGehaltesanVerunreinigungen (ISO658:2002) ThisEuropeanStandardwasapprovedbyCENon6March2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatethecondit
10、ionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aver
11、sioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Lu
12、xembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCE
13、NnationalMembers. Ref.No.ENISO658:2002EINESO56:8002(2E) 2 CORRECTED20020515 Foreword Thisdocument(ISO658:2002)hasbeenpreparedbyTechnicalCommitteeISO/TC34 “Agriculturalfoodproducts“incollaborationwithTechnicalCommitteeCEN/TC307“Oilseeds, vegetableandanimalfatsandoilsandtheirbyproductsMethodsofsamplin
14、gandanalysis“, thesecretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublication ofanidenticaltextorbyendorsement,atthelatestbyOctober2002,andconflictingnational standardsshallbewithdrawnatthelatestbyOctober2002. ThisdocumentsupersedesENISO658:1995.
15、 AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium, CzechRepublic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy, Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,Switzer
16、landandthe UnitedKingdom. Endorsementnotice ThetextoftheInternationalStandardISO658:2002hasbeenapprovedbyCENasa EuropeanStandardwithoutanymodifications. NOTENormativereferencestoInternationalStandardsarelistedinannexZA(normative). ENISO658:2002 Reference number ISO 658:2002(E) OSI 2002INTERNATIONAL
17、STANDARD ISO 658 Third edition 2002-04-01 Oilseeds Determination of content of impurities Graines olagineuses Dtermination de la teneur en impurets ENISO658:2002IS:856 O2002(E) lcsid FDParemi ihTs PDF file mac ytnoaie nmt deddebyfepca.se In ccaocnadrw eith Aebods licsneilop gnic,y this file mairp eb
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22、E-mail cirypothgiso.ch Web ww.wiso.ch ii I SO 2002 All irthgs ersedevr ENISO658:2002IS:856 O2002(E) I SO 2002 All irthgs ersedevr iiiContents Page Foreword.iv 1 Scope 1 2 Normative references1 3 Terms and definitions .1 4 Principle2 5 Apparatus .2 6 Sampling.2 7 Preparation of test sample2 8 Procedu
23、re .2 8.1 Test portion 3 8.2 Determination.3 9 Expression of results 4 9.1 Method of calculation4 10 Precision.7 10.1 Interlaboratory test7 10.2 Repeatability 7 10.3 Reproducibility.7 11 Test report 8 Annex A (informative) Results of interlaboratory trial 9 Bibliography10 ENISO658:2002IS:856 O2002(E
24、) iv I SO 2002 All irthgs ersedevr 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 in
25、terested 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 Electrotechni
26、cal 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 Standards. Draft International Standards adopted by the
27、 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 of this International Standard may be the subject of
28、patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 658 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 2, Oleaginous seeds and fruits. This third edition cancels and replaces the second edition (ISO 658:1988), which has b
29、een technically revised. Annex A of this International Standard is for information only. ENISO658:2002INTENRATIONAL TSANDADR IS:856 O2002(E)I SO 2002 All irthgs ersedevr 1Oilseeds Determination of content of impurities 1 Scope This International Standard specifies a method for the determination of t
30、he impurities content in oilseeds used as primary industrial materials. It also defines the various categories of what are usually understood to be impurities. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of
31、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 this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normativ
32、e 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 valid International Standards. ISO 659, Oilseeds Determination of oil content (Reference method) ISO 664, Oilseeds Reduction o
33、f laboratory sample to test sample 3 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 impurities in oilseeds all foreign matter, organic and inorganic, other than seeds of the species under consideration 3.2 fines in oilseeds parti
34、cles passing through the sieves of aperture sizes given in Table 1, according to the species being analysed NOTE In the case of groundnuts, meal from the seeds contained in the fines is not regarded as an impurity. 3.3 non-oleaginous impurities non-oleaginous foreign bodies, fragments of stalks, lea
35、ves and all other non-oleaginous parts belonging to the oleaginous seed analysed, retained by the sieves of aperture sizes given in Table 1 EXAMPLES Bits of wood, pieces of metal, stones, seeds of non-oleaginous plants, and bits of shell, loose or adhering to palm kernels. NOTE In the case of seeds
36、sold in their shells, for example sunflower seeds (Helianthus annuus L.) or pumpkin seeds (Cucurbita pepo L.), the loose shells are regarded as impurities only if their proportion is larger than that of the corresponding kernels present in the same sample. 3.4 oleaginous impurities oilseeds other th
37、an those of the species under consideration ENISO658:20021IS:856 O2002(E) 2 I SO 2002 All irthgs ersedevr 4 Principle The impurities are separated, by sieving and sorting, into three categories as follows: fines; non-oleaginous impurities; oleaginous impurities. The mass of total impurities is deter
38、mined or, on request, the mass of each category of impurity. 5 Apparatus 5.1 Sieves, having round holes with diameters as given in Table 1. 5.2 Tweezers, or other suitable instruments. 5.3 Analytical balance, capable of being read to the nearest 0,005 g. 5.4 Sample dividers, capable of taking 10 g s
39、ample aliquots of small seeds and 100 g sample aliquots of sunflower seeds and soyabeans. Table 1 Aperture sizes of sieves Nature of product Aperture diameter mm Copra 2,0 Medium and larger sized seeds (see ISO 664) 1,0 Small seeds (see ISO 664) 0,5 6 Sampling Sampling is not part of the method spec
40、ified in this International Standard. A recommended sampling method is given in ISO 542 1. It is important the laboratory receive a sample which is truly representative and has not been damaged or changed during transport or storage. 7 Preparation of test sample Prepare the test sample in accordance
41、 with ISO 664. 8 Procedure NOTE If it is required to check whether the repeatability limits (10.2) are met, carry out two single determinations in accordance with 8.2.2 to 8.2.3. ENISO658:20022IS:856 O2002(E) I SO 2002 All irthgs ersedevr 38.1 Test portion Take as the test portion a complete test sa
42、mple (see clause 7). For a complete analysis, two or four test samples are necessary (see 10.2). Weigh the test portion to the nearest 0,1 g. 8.2 Determination 8.2.1 General The determination of impurities content shall be carried out sufficiently quickly to avoid any appreciable change in the moist
43、ure content of the seed. 8.2.2 Separation of fines Separate the fines quantitatively by sieving the test portion on the sieve (see 5.1) and collecting them. In the case of groundnuts, collect the total fines thus obtained, which include non-oleaginous fines and fines from the seed. Weigh them to the
44、 nearest 0,01 g and determine their oil content by the method specified in ISO 659. Determine also the oil content of the pure seeds by the method specified in ISO 659 in order to calculate the content of non-oleaginous fines. 8.2.3 Separation of oleaginous and non-oleaginous impurities 8.2.3.1 Copr
45、a and medium and larger sized seeds, apart from sunflower seeds and soya beans In the material retained by the sieve (see 5.1), separate, by means of tweezers or any other suitable instrument (see 5.2), the non-oleaginous impurities (see 3.3), if necessary detaching bits of shell adhering to the see
46、ds (as is the case with palm kernels) from the oleaginous impurities (see 3.4). Weigh together, to the nearest 0,01 g, the non-oleaginous and oleaginous impurities and the fines (see 8.2.2), except in the case of groundnuts. On request, weigh separately, to the nearest 0,01 g, each category of impur
47、ity. If stipulated in the contract, note the nature of the oleaginous impurities in order that this can be recorded in the test report. 8.2.3.2 Sunflower seeds and soya beans In the material retained by the sieve (see 5.1), separate, by means of tweezers or any other appropriate instrument (see 5.2)
48、, the impurities whose dimensions differ clearly from those of the sunflower seeds or soya beans being examined (large impurities). Class these impurities into two categories (oleaginous and non-oleaginous) and weigh each of them to within 0,01 g. Using an aliquot portion (minimum 100 g, weighed to the nearest 0,1 g) of partially sorted sunflower seeds or soya beans, separate, by manual sorting, the oleaginous impurities and the non
