EN ISO 6320:2000
(Main)Animal and vegetable fats and oils - Determination of refractive index (ISO 6320:2000)
Animal and vegetable fats and oils - Determination of refractive index (ISO 6320:2000)
Migrated from Progress Sheet (TC Comment) (2000-07-10): A Formal Vote was launched on 1999-02-04 on prEN ISO 6320=(EN 6320:1995, ++ including DRAFT Amendment 1:1998). The result was positive BUT ISO decided not ++ to finalize the Amendment 1 as such, but to submit an ISO/FDIS 6320 (including ++ the content of the amendment) to vote (target date: 1999-10) -> case for ++ resynchronization (see e-mail to BT Members, July 1999). (MAL/1999-07-06)
Tierische und pflanzliche Fette und Öle - Bestimmung des Brechungsindex (ISO 6320:2000)
Die vorliegende Internationale Norm legt ein Verfahren zur Bestimmung des Brechungsindex von tierischen und pflanzlichen Fetten und Ölen fest.
Corps gras d'origines animale et végétale - Détermination de l'indice de réfraction (ISO 6320:2000)
Rastlinske in živalske maščobe in olja - Določevanje lomnega koeficienta (ISO 6320:2000)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2001
5DVWOLQVNHLQåLYDOVNHPDãþREHLQROMD'RORþHYDQMHORPQHJDNRHILFLHQWD ,62
Animal and vegetable fats and oils - Determination of refractive index (ISO 6320:2000)
Tierische und pflanzliche Fette und Öle - Bestimmung des Brechungsindex (ISO
6320:2000)
Corps gras d'origines animale et végétale - Détermination de l'indice de réfraction (ISO
6320:2000)
Ta slovenski standard je istoveten z: EN ISO 6320:2000
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.
INTERNATIONAL ISO
STANDARD 6320
Fourth edition
2000-03-15
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 6320:2000(E)
©
ISO 2000
ISO 6320:2000(E)
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ii © ISO 2000 – All rights reserved
ISO 6320:2000(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.
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.
International Standard ISO 6320 was prepared by Technical Committee ISO/TC 34, Agricultural food products,
Subcommittee SC 11, Animal and vegetable fats and oils.
This fourth edition cancels and replaces the third edition (ISO 6320:1995), which has been revised by the addition
of precision data.
Annex A of this International Standard is for information only.
INTERNATIONAL STANDARD ISO 6320:2000(E)
Animal and vegetable fats and oils — Determination of
refractive index
1 Scope
This International Standard specifies a method for the determination of the refractive index of animal and vegetable
fats and oils.
2 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, this publication do
not apply. However, parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent edition of the normative document 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 661, Animal and vegtable fats and oils — Preparation of test sample.
3 Terms and definitions
For the purposes of this International Standard, the following term and definition apply.
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 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 The refractive index of a given substance varies with the wavelength of the incident light and with temperature. The
t
notation used n , where t is the temperature in degrees Celsius.
D
4Principle
By means of a suitable refractometer, the refractive index of a liquid sample is measured at a specified
temperature.
5 Reagents
Use only reagents of recognized analytical grade, and distilled or demineralized water or water of equivalent purity.
5.1 Ethyl laurate, of quality suitable for refractometry, and of known refractive index.
ISO 6320:2000(E)
5.2 Hexane, or other suitable solvents, such as light petroleum, acetone or toluene, for cleaning the prism of
the refractometer.
6 Apparatus
Usual laboratory equipment and, in particular, the following.
6.1 Refractometer, for example of the Abbé type, suitable for measurements of refractive index to within
� 0,000 1 over the range n =1,300 to n = 1,700.
D D
6.2 Light source: sodium vapour lamp
White light can also be used if the refractometer is fitted with an achromatic compensation system.
6.3 Glass plate, of known refra
...
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