EN ISO 658:2002

Oilseeds - Determination of content of impurities (ISO 658:2002)

This International Standard specifies a method for the determination of the impurities content in oilseeds used as primary industrial materials. It also defines the various categories of what are usually understood to be impurities.

Ölsamen - Bestimmung des Gehaltes an Verunreinigungen (ISO 658:2002)

Diese Internationale Norm legt ein Verfahren zur Bestimmung des Anteils an Verunreinigungen (Besatz) in Ölsamen fest, die als Rohstoffe in der Industrie verwendet werden. Die verschiedenen Kategorien an Verunreinigungen werden nach allgemein üblichen Auffassungen definiert.

Graines oléagineuses - Détermination de la teneur en impuretés (ISO 658:2002)

La présente Norme internationale spécifie une méthode pour la détermination de la teneur en impuretés des graines oléagineuses utilisées comme matière première industrielle. En outre, elle définit les diverses catégories d'impuretés dans leur acception usuelle.

Oljnice - Določevanje nečistoč (ISO 658:2002)

General Information

• Status: Published
• Publication Date: 31-Mar-2002
• Withdrawal Date: 30-Oct-2002
• ICS: 67.200.20 - Oilseeds
• Technical Committee: CEN/TC 307 - Oilseeds, vegetables and animal fats and oils and their by-products - Methods of sampling and analys
• Drafting Committee: CEN/TC 307 - Oilseeds, vegetables and animal fats and oils and their by-products - Methods of sampling and analys
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 01-Apr-2002
• Completion Date: 01-Apr-2002
• Ref Project: SIST EN ISO 658:2002 - Oilseeds - Determination of content of impurities (ISO 658:2002)

Overview

EN ISO 658:2002 - Oilseeds: Determination of content of impurities (ISO 658:2002) specifies a laboratory method to determine the content of impurities in oilseeds used as primary industrial materials. The standard defines impurity categories and a practical sieving-and-sorting procedure to quantify total impurities or the mass fraction of each category. It is intended for use in quality control, grading, contract testing and reporting of oilseeds.

Key topics and technical requirements

• Scope and definitions
  • Impurities are any foreign matter (organic or inorganic) other than seeds of the species under test.
  • Three impurity categories: fines, non-oleaginous impurities, and oleaginous impurities.
• Principle
  • Separation by sieving and manual sorting, followed by accurate weighing and optional oil-content determination for fines (e.g., groundnuts).
• Apparatus and precision
  • Sieves with specified round-hole aperture sizes: copra 2.0 mm, medium and larger seeds 1.0 mm, small seeds 0.5 mm.
  • Analytical balance readable to 0.005 g, tweezers (or suitable instruments), and sample dividers (10 g aliquots for small seeds; 100 g aliquots for sunflower and soyabeans).
  • Test portion (complete test sample) weighed to 0.1 g; fractions weighed to 0.01 g or 0.005 g depending on fraction and seed type.
• Procedure highlights
  • Prepare test sample per ISO 664 (sample reduction).
  • Rapid determination to avoid moisture change.
  • Sieving to isolate fines; manual sorting of retained material into oleaginous vs. non-oleaginous impurities.
  • For sunflower and soyabeans: separate large impurities then use a 100 g aliquot to sort small impurities.
  • For groundnuts: determine oil content of fines and pure seeds using ISO 659 when needed to distinguish seed meal from impurities.
• Results reporting
  • Express impurities as a mass fraction (%) of the test portion. Optionally report each impurity category and, on request, species breakdown for foreign oilseeds.
• Precision
  • The standard includes sections on repeatability and reproducibility based on interlaboratory trials.

Applications and users

• Who uses EN ISO 658:2002:
  • Seed testing laboratories, quality-control teams at crushers and oil mills, commodity traders, certification bodies and regulatory authorities.
• Typical use cases:
  • Grading and acceptance testing of oilseeds (sunflower, soyabeans, groundnuts, copra, small seeds).
  • Contract compliance and dispute resolution where impurity content affects price.
  • Process optimization - determining cleaning efficiency and loss associated with fines and foreign seeds.
  • Accurate calculation of net oil-bearing material (combined with ISO 659 oil-content results).

Related standards

• ISO 659 - Oilseeds: Determination of oil content (reference method)
• ISO 664 - Oilseeds: Reduction of laboratory sample to test sample
• ISO 542 - Recommended sampling procedures (sampling not part of EN ISO 658:2002)

Keywords: EN ISO 658:2002, oilseeds impurities determination, oilseed quality, sieving method, fines, non-oleaginous impurities, oleaginous impurities, ISO 659, ISO 664.

Standards Content (Sample)

SLOVENSKI STANDARD
1DGRPHãþD
SIST EN ISO 658:1996
2OMQLFH'RORþHYDQMHQHþLVWRþ,62
Oilseeds - Determination of content of impurities (ISO 658:2002)
Ölsamen - Bestimmung des Gehaltes an Verunreinigungen (ISO 658:2002)
Graines oléagineuses - Détermination de la teneur en impuretés (ISO 658:2002)
Ta slovenski standard je istoveten z: EN ISO 658:2002
ICS:
67.200.20 Oljnice Oilseeds
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 658
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2002
ICS 67.200.20 Supersedes EN ISO 658:1995
English version
Oilseeds - Determination of content of impurities (ISO 658:2002)
Graines oléagineuses - Détermination de la teneur en Ölsamen - Bestimmung des Gehaltes an Verunreinigungen
impuretés (ISO 658:2002) (ISO 658:2002)
This European Standard was approved by CEN on 6 March 2002.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 658:2002 E
worldwide for CEN national Members.

CORRECTED  2002-05-15
Foreword
This document (ISO 658:2002) has been prepared by Technical Committee ISO/TC 34
"Agricultural food products" in collaboration with Technical Committee CEN/TC 307 "Oilseeds,
vegetable and animal fats and oils and their by-products - Methods of sampling and analysis",
the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication
of an identical text or by endorsement, at the latest by October 2002, and conflicting national
standards shall be withdrawn at the latest by October 2002.
This document supersedes EN ISO 658:1995.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the
United Kingdom.
Endorsement notice
The text of the International Standard ISO 658:2002 has been approved by CEN as a
European Standard without any modifications.
NOTE Normative references to International Standards are listed in annex ZA (normative).
Annex ZA
(normative)
Normative references to international publications
with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions
of any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE Where an International Publication has been modified by common modifications,
indicated by (mod.), the relevant EN/HD applies.
Publication Year Title EN Year
Oilseeds — Determination of oil
ISO 659 1998 EN ISO 658 1998
content (Reference method)
ISO 664 1990 Oilseeds — Reduction of laboratory EN ISO 664 1995
sample to test sample
INTERNATIONAL ISO
STANDARD 658
Third edition
2002-04-01
Oilseeds — Determination of content of
impurities
Graines oléagineuses — Détermination de la teneur en impuretés

Reference number
ISO 658:2002(E)
©
ISO 2002
ISO 658:2002(E)
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ii © ISO 2002 – All rights reserved

ISO 658:2002(E)
Contents Page
Foreword.iv
1 Scope .1
2 Normative references.1
3 Terms and definitions .1
4 Principle.2
5 Apparatus .2
6 Sampling.2
7 Preparation of test sample.2
8 Procedure .2
8.1 Test portion .3
8.2 Determination.3
9 Expression of results .4
9.1 Method of calculation.4
10 Precision.7
10.1 Interlaboratory test.7
10.2 Repeatability .7
10.3 Reproducibility.7
11 Test report .8
Annex A (informative) Results of interlaboratory trial .9
Bibliography.10

ISO 658:2002(E)
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 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 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 Standards. 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 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 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 been technically revised.
Annex A of this International Standard is for information only.

iv © ISO 2002 – All rights reserved

INTERNATIONAL STANDARD ISO 658:2002(E)

Oilseeds — Determination of content of impurities
1 Scope
This International Standard specifies a method for the determination of the 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
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 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 valid International Standards.
ISO 659, Oilseeds — Determination of oil content (Reference method)
ISO 664, Oilseeds — Reduction of 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
particles 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, leaves 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 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 than those of the species under consideration
ISO 658:2002(E)
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 determined 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 o
...