EN ISO 6320:2017

SLOVENSKI STANDARD
01-maj-2017
1DGRPHãþD
SIST EN ISO 6320:2001
SIST EN ISO 6320:2001/AC:2007
5DVWOLQVNHLQåLYDOVNHPDãþREHLQROMD'RORþHYDQMHORPQHJDNRHILFLHQWD,62

Animal and vegetable fats and oils - Determination of refractive index (ISO 6320:2017)
Tierische und pflanzliche Fette und Öle - Bestimmung des Brechungsindex (ISO
6320:2017)
Corps gras d'origines animale et végétale - Détermination de l'indice de réfraction (ISO
6320:2017)
Ta slovenski standard je istoveten z: EN ISO 6320:2017
ICS:
67.200.10 5DVWOLQVNHLQåLYDOVNH Animal and vegetable fats
PDãþREHLQROMD and oils
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 6320
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2017
EUROPÄISCHE NORM
ICS 67.200.10 Supersedes EN ISO 6320:2000
English Version
Animal and vegetable fats and oils - Determination of
refractive index (ISO 6320:2017)
Corps gras d'origines animale et végétale - Tierische und pflanzliche Fette und Öle - Bestimmung
Détermination de l'indice de réfraction (ISO des Brechungsindex (ISO 6320:2017)
6320:2017)
This European Standard was approved by CEN on 9 March 2017.

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 CEN-CENELEC 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 CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6320:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 6320:2017) has been prepared by Technical Committee ISO/TC 34 “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 September 2017, and conflicting national standards
shall be withdrawn at the latest by September 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 6320:2000.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 6320:2017 has been approved by CEN as EN ISO 6320:2017 without any modification.
INTERNATIONAL ISO
STANDARD 6320
Fifth edition
2017-02
Animal and vegetable fats and oils —
Determination of refractive index
Corps gras d’origines animale et végétale — Détermination de l’indice
de réfraction
Reference number
ISO 6320:2017(E)
©
ISO 2017
ISO 6320:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
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ii © ISO 2017 – All rights reserved

ISO 6320:2017(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative reference . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Sampling . 2
8 Preparation of test sample . 2
9 Procedure. 2
9.1 Calibration of the instrument . 3
9.2 Determination . 3
10 Calculation . 3
11 Precision . 4
11.1 Interlaboratory test. 4
11.2 Repeatability . 4
11.3 Reproducibility . 4
12 Test report . 4
Annex A (normative) Results of an interlaboratory test. 5
Bibliography . 6
ISO 6320:2017(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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: w w w . i s o .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 11,
Animal and vegetable fats and oils.
This fifth edition cancels and replaces the fourth edition (ISO 6320:2000), of which it constitutes a
minor revision by the addition of an exclusion for fat coming from milk and milk products.
iv © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 6320:2017(E)
Animal and vegetable fats and oils — Determination of
refractive index
1 Scope
This document specifies a method for the determination of the refractive index of animal and vegetable
fats and oils.
Milk and milk products (or fat coming from milk and milk products) are excluded from the scope of this
document.
2 Normative reference
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 661, Animal and vegetable fats and oils — Preparation of test sample
ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results — Part 1: General
principles and definition
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method
for the determination of repeatability and reproducibility of a standard measurement method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
refractive index (of a medium)
ratio of the velocity of light of a definite wavelength in a vacuum to its velocity in the medium
Note 1 to entry: In practice, the velocity of light in air is used in place of that in a vacuum and, unless otherwise
specified, the selected wavelength is the mean wavelength of the sodium D lines (589,6 nm).
Note 2 to entry: The refractive index of a given substance varies with the wavelength of the incident light and
t
with temperature. The notation used is n , where t is the temperature in degrees Celsius.
D
4 Principle
By means of a suitable refractometer, the refractive index of a liquid sample is measured at a specified
temperature.
...