EN ISO 3960:2017
(Main)Animal and vegetable fats and oils - Determination of peroxide value - Iodometric (visual) endpoint determination (ISO 3960:2017)
Animal and vegetable fats and oils - Determination of peroxide value - Iodometric (visual) endpoint determination (ISO 3960:2017)
ISO 3960:2017 specifies a method for the iodometric determination of the peroxide value of animal and vegetable fats and oils with a visual endpoint detection. The peroxide value is a measure of the amount of oxygen chemically bound to an oil or fat as peroxides, particularly hydroperoxides.
The method is applicable to all animal and vegetable fats and oils, fatty acids and their mixtures with peroxide values from 0 meq to 30 meq (milliequivalents) of active oxygen per kilogram. It is also applicable to margarines and fat spreads with varying water content. The method is not suitable for milk fats and is not applicable to lecithins.
It is to be noted that the peroxide value is a dynamic parameter, whose value is dependent upon the history of the sample. Furthermore, the determination of the peroxide value is a highly empirical procedure and the value obtained depends on the sample mass. It is stressed that, due to the prescribed sample mass, the peroxide values obtained can be slightly lower than those obtained with a lower sample mass.
Milk and milk products (or fat coming from milk and milk products) are excluded from the scope of this document.
NOTE 1 A preferred method for the iodometric determination of the peroxide value for milk fats is specified in ISO 3976.
NOTE 2 A method for the potentiometric determination of the peroxide value is given in ISO 27107.
Tierische und pflanzliche Fette und Öle - Bestimmung der Peroxidzahl - Iodometrische (visuelle) Endpunktbestimmung (ISO 3960:2017)
Corps gras d'origines animale et végétale - Détermination de l'indice de peroxyde - Détermination avec point d'arrêt iodométrique (ISO 3960:2017)
ISO 3960:2017 spécifie une méthode de détermination iodométrique de l'indice de peroxyde des corps gras d'origines animale et végétale par la détection visuelle de la fin du dosage. L'indice de peroxyde est une mesure de la quantité d'oxygène chimiquement lié à une huile ou un corps gras sous forme de peroxydes, en particulier d'hydroperoxydes.
Cette méthode s'applique à tous les corps gras d'origines animale et végétale, aux acides gras et à leurs mélanges pour des indices de peroxyde compris entre 0 méq et 30 méq (milliéquivalents) d'oxygène actif par kilogramme. Elle est également applicable aux margarines et matières grasses à tartiner de teneur en eau variable. La présente méthode ne convient pas pour les matières grasses présentes dans le lait; elle ne s'applique pas non plus aux lécithines.
Il convient de noter que l'indice de peroxyde est un paramètre dynamique dont la valeur dépend de l'historique de l'échantillon. En outre, la détermination de l'indice de peroxyde est un mode opératoire très empirique et l'indice obtenu dépend de la masse de l'échantillon. Il faut remarquer que, du fait de la masse d'échantillon spécifiée, les indices de peroxyde obtenus peuvent être légèrement inférieurs à ceux obtenus avec des masses d'échantillon plus faibles.
Le lait et les produits laitiers (ou les corps gras issus du lait et des produits laitiers) sont exclus du domaine d'application du présent document.
NOTE 1 Une méthode préférable pour la détermination iodométrique de l'indice de peroxyde pour les matières grasses présentes dans le lait est spécifiée dans l'ISO 3976.
NOTE 2 Une méthode de détermination potentiométrique de l'indice de peroxyde est donnée dans l'ISO 27107.
Živalske in rastlinske maščobe in olja - Ugotavljanje peroksidnega števila - Jodometrično (vizualno) določanje končne točke (ISO 3960:2017)
Ta dokument določa metodo za idiometrično določevanje peroksidnega števila živalskih in rastlinskih masti in olj z vizualnim zaznavanjem končne točke. Peroksidno število je merilo za količino kisika, kemijsko vezanega z oljem ali maščobo v obliki peroksidov, zlasti hidroperoksidov.
Metoda se uporablja za vse vrste živalskih in rastlinskih masti in olj, maščobne kisline ter njihovih mešanic s peroksidnim številom od 0 do 30 meq (miliekvivalentov) aktivnega kisika na kilogram. Uporablja se tudi za margarine in maščobne namaze z različno vsebnostjo vode. Metoda ni primerna za mlečne maščobe in se ne uporablja za lecitine.
Upoštevati je treba, da je peroksidno število dinamični parameter, katerega vrednost je odvisna od zgodovine vzorca. Poleg tega je določevanje peroksidnega števila izredno empiričen postopek, pridobljena vrednost pa je odvisna od vzorčne mase. Treba je poudariti, da je lahko zaradi predpisane vzorčne mase pridobljeno peroksidno število nekoliko nižje od števila, pridobljenega z nižjo vzorčno maso.
Mleko in mlečni izdelki (ali maščoba iz mleka in mlečnih izdelkov) niso zajeti v tem dokumentu.
OPOMBA 1 A: Priporočljiva metoda za idiometrično določevanje peroksidnega števila mlečnih maščob je podana v standardu ISO 3976.
OPOMBA 2 A: Metoda za potenciometrično določevanje peroksidnega števila je opredeljena podana v standardu ISO 27107.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2017
1DGRPHãþD
SIST EN ISO 3960:2010
äLYDOVNHLQUDVWOLQVNHPDãþREHLQROMD8JRWDYOMDQMHSHURNVLGQHJDãWHYLOD
-RGRPHWULþQR YL]XDOQR GRORþDQMHNRQþQHWRþNH ,62
Animal and vegetable fats and oils - Determination of peroxide value - Iodometric (visual)
endpoint determination (ISO 3960:2017)
Tierische und pflanzliche Fette und Öle - Bestimmung der Peroxidzahl - Iodometrische
(visuelle) Endpunktbestimmung (ISO 3960:2017)
Corps gras d'origines animale et végétale - Détermination de l'indice de peroxyde -
Détermination avec point d'arrêt iodométrique (ISO 3960:2017)
Ta slovenski standard je istoveten z: EN ISO 3960:2017
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 3960
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2017
EUROPÄISCHE NORM
ICS 67.200.10 Supersedes EN ISO 3960:2010
English Version
Animal and vegetable fats and oils - Determination of
peroxide value - Iodometric (visual) endpoint
determination (ISO 3960:2017)
Corps gras d'origines animale et végétale - Tierische und pflanzliche Fette und Öle - Bestimmung
Détermination de l'indice de peroxyde - Détermination der Peroxidzahl - Iodometrische (visuelle)
avec point d'arrêt iodométrique (ISO 3960:2017) Endpunktbestimmung (ISO 3960:2017)
This European Standard was approved by CEN on 8 February 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,
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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 3960:2017 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 3960:2017) 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 August 2017, and conflicting national standards shall
be withdrawn at the latest by August 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 3960:2010.
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 3960:2017 has been approved by CEN as EN ISO 3960:2017 without any modification.
INTERNATIONAL ISO
STANDARD 3960
Fifth edition
2017-02
Animal and vegetable fats and oils —
Determination of peroxide value
— Iodometric (visual) endpoint
determination
Corps gras d’origines animale et végétale — Détermination de l’indice
de peroxyde — Détermination avec point d’arrêt iodométrique
Reference number
ISO 3960:2017(E)
©
ISO 2017
ISO 3960:2017(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
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ii © ISO 2017 – All rights reserved
ISO 3960:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents . 2
6 Apparatus . 3
7 Sampling . 4
8 Preparation of test sample . 4
9 Procedure. 4
9.1 General . 4
9.2 Preparation and titre determination of the 0,01 N sodium thiosulfate standard solution . 4
9.2.1 Preparation of the 0,01 N sodium thiosulfate standard solution . 4
9.2.2 Determination of the titre of the 0,01 N sodium thiosulfate standard
solution (factor determination) . 5
9.3 Determination of peroxide value . 5
10 Calculation and expression of results . 6
11 Precision of the method . 6
11.1 Interlaboratory test. 6
11.2 Repeatability . 6
11.3 Reproducibility . 7
12 Test report . 7
Annex A (informative) Results of an interlaboratory test . 8
Bibliography .10
ISO 3960:2017(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
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electrotechnical standardization.
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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/d irectives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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Technical Barriers to Trade (TBT) see the following URL: ww w .iso. 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 3960:2007), of which it constitutes a
minor revision to exclude fat coming from milk and milk products.
iv © ISO 2017 – All rights reserved
ISO 3960:2017(E)
Introduction
Over a period of many years, various methods have been developed for the determination of peroxides
in fats and oils. The general principle of most of the methods is the liberation of iodine from potassium
iodide in an acid medium. The method according to Wheeler was standardized more than 50 years
ago by different standardization bodies, and it is widely used to control commodities by producers,
receivers and official laboratories. In national and international food legislation (including the Codex
Alimentarius), acceptable limits for the peroxide values are often specified. Due to anomalies in the
reproducibility of the results, it was noticed that there are slight differences between the standardized
methods. A very important point is the dependence of the result on the amount of sample used for
the determination. As the determination of the peroxide value (PV) is a highly empirical procedure,
ISO/TC 34/SC 11 has decided to fix the sample mass at 5 g for PV greater than 1, and at 10 g for PV less
than or equal to 1, and to limit the applicability of this method to animal and vegetable fats and oils
with peroxide values from 0 meq to 30 meq of
...
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