SIST EN ISO 8968-4:2002

Milk - Determination of nitrogen content - Part 4: Determination of non-protein nitrogen content (ISO 8968-4:2001)

Specifies the method for the determination of the non-protein nitrogen content of milk.

Milch - Bestimmung des Stickstoffgehaltes - Teil 4: Bestimmung des Nichtproteinstickstoff-Gehaltes (ISO 8968-4:2001)

Dieser Teil von ISO 8968/IDF 20 legt ein Verfahren zur Bestimmung des Nichtproteinstickstoff-Gehaltes flüssiger Vollmilch oder entrahmter Milch fest.

Lait - Détermination de la teneur en azote - Partie 4: Détermination de la teneur en azote non protéique (ISO 8968-4:2001)

L'ISO 8968-4|FIL 20-4:2001 spécifie une méthode pour la détermination de la teneur en azote non protéique du lait liquide, entier ou écrémé.

Mleko - Določevanje dušika - 4. del: Določevanje nebeljakovinskega dušika (ISO 8968-4:2001)

Določa metodo za določevanje nebeljakovinskega dušika v mleku.

General Information

• Status: Withdrawn
• Publication Date: 31-May-2002
• Withdrawal Date: 16-Jun-2016
• ICS: 67.100.10 - Milk and processed milk products
• Technical Committee: KŽP - Agricultural food products
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 17-Jun-2016
• Due Date: 10-Jul-2016
• Completion Date: 17-Jun-2016
• Ref Project: EN ISO 8968-4:2001 - Milk - Determination of nitrogen content - Part 4: Determination of non-protein nitrogen content (ISO 8968-4:2001)

Relations

• Replaced By: SIST EN ISO 8968-4:2016 - Milk and milk products - Determination of nitrogen content - Part 4: Determination of protein and non-protein nitrogen content and true protein content calculation (Reference method) (ISO 8968-4:2016)
• Effective Date: 01-Jul-2016
• Corrected By: SIST EN ISO 8968-4:2002/AC:2012 - Milk - Determination of nitrogen content - Part 4: Determination of non-protein-nitrogen content - Technical Corrigendum 1 (ISO 8968-4:2001/Cor 1:2011)
• Effective Date: 08-Jun-2022
• Corrected By: SIST EN ISO 8968-4:2002/AC:2012 - Milk - Determination of nitrogen content - Part 4: Determination of non-protein-nitrogen content - Technical Corrigendum 1 (ISO 8968-4:2001/Cor 1:2011)
• Effective Date: 01-May-2012

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 8968-4:2002
01-junij-2002
0OHNR'RORþHYDQMHGXãLNDGHO'RORþHYDQMHQHEHOMDNRYLQVNHJDGXãLND,62

Milk - Determination of nitrogen content - Part 4: Determination of non-protein nitrogen
content (ISO 8968-4:2001)
Milch - Bestimmung des Stickstoffgehaltes - Teil 4: Bestimmung des
Nichtproteinstickstoff-Gehaltes (ISO 8968-4:2001)
Lait - Détermination de la teneur en azote - Partie 4: Détermination de la teneur en azote
non protéique (ISO 8968-4:2001)
Ta slovenski standard je istoveten z: EN ISO 8968-4:2001
ICS:
67.100.10 0OHNRLQSUHGHODQLPOHþQL Milk and processed milk
SURL]YRGL products
SIST EN ISO 8968-4:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 8968-4:2002

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SIST EN ISO 8968-4:2002
EUROPEAN STANDARD
EN ISO 8968-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2001
ICS 67.100.10
English version
Milk - Determination of nitrogen content - Part 4: Determination
of non-protein nitrogen content (ISO 8968-4:2001)
Lait - Détermination de la teneur en azote - Partie 4: Milch - Bestimmung des Stickstoffgehaltes - Teil 4:
Détermination de la teneur en azote non protéique (ISO Bestimmung des Nichtproteinstickstoff-Gehaltes (ISO
8968-4:2001) 8968-4:2001)
This European Standard was approved by CEN on 15 December 2001.
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, 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
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8968-4:2001 E
worldwide for CEN national Members.

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SIST EN ISO 8968-4:2002
EN ISO 8968-4:2001 (E)
CORRECTED  2002-03-13
Foreword
This document (ISO 8968-4:2001) has been prepared by Technical Committee ISO/TC 34
"Agricultural food products" in collaboration with Technical Committee CEN/TC 302 "Milk and
milk products - Methods of sampling and analysis", the secretariat of which is held by NEN.
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 June 2002, and conflicting national
standards shall be withdrawn at the latest by June 2002.
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,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of the International Standard ISO 8968-4:2001 has been approved by CEN as a
European Standard without any modifications.
NOTE Normative references to International Standards are listed in annex ZA (normative).
2

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SIST EN ISO 8968-4:2002
EN ISO 8968-4:2001 (E)
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
ISO 8968-1 2001 Milk — Determination of nitrogen EN ISO 8968-1 2001
content — Part 1: Kjeldahl method.
ISO 8968-2 2001 Milk — Determination of nitrogen EN ISO 8968-2 2001
content — Part 2: Block-digestion
method (Macro method).
3

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SIST EN ISO 8968-4:2002

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SIST EN ISO 8968-4:2002



INTERNATIONAL ISO
STANDARD 8968-4
IDF
20-4
First edition
2001-12-15


Milk — Determination of nitrogen
content —
Part 4:
Determination of non-protein-nitrogen
content
Lait — Détermination de la teneur en azote —
Partie 4: Détermination de la teneur en azote non protéique




Reference numbers
ISO 8968-4:2001(E)
IDF 20-4:2001(E)
©
 ISO and IDF 2001

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SIST EN ISO 8968-4:2002
ISO 8968-4:2001(E)
IDF 20-4:2001(E)
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©  ISO and IDF 2001
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from either ISO or IDF at the respective address below.
ISO copyright office International Dairy Federation
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Printed in Switzerland

ii © ISO and IDF 2001 – All rights reserved

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SIST EN ISO 8968-4:2002
ISO 8968-4:2001(E)
IDF 20-4:2001(E)
Contents Page
Foreword.iv
1 Scope.1
2 Normative references.1
3 Term and definition .1
4 Principle.1
5 Reagents.2
6 Apparatus.2
7 Sampling.3
8 Preparation of test sample.3
9 Procedure.3
9.1 Test portion.3
9.2 Determination.3
9.3 Blank test.4
10 Calculation and expression of results.4
11 Precision.5
11.1 Interlaboratory test.5
11.2 Repeatability.5
11.3 Reproducibility.5
12 Test report.5
Bibliography.6


© ISO and IDF 2001 – All rights reserved iii

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SIST EN ISO 8968-4:2002
ISO 8968-4:2001(E)
IDF 20-4:2001(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 part of ISO 8968IDF 20 may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 8968-4IDF 20-4 was prepared by Technical Committee ISO/TC 34, Food products,
Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF), in collaboration with
AOAC International. It is being published jointly by ISO and IDF and separately by AOAC International.
ISO 8968IDF 20 consists of the following parts, under the general title Milk — Determination of nitrogen content:
— Part 1: Kjeldahl method
— Part 2: Block-digestion method (Macro method)
— Part 3: Block-digestion method (Semi-micro rapid routine method)
— Part 4: Determination of the non-protein-nitrogen content
— Part 5: Determination of the protein-nitrogen content

iv © ISO and IDF 2001 – All rights reserved

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SIST EN ISO 8968-4:2002
ISO 8968-4:2001(E)
IDF 20-4:2001(E)
Foreword
IDF (the International Dairy Federation) is a worldwide federation of the dairy sector with a National Committee in
every member country. Every National Committee has the right to be represented on the IDF Standing Committees
carrying out the technical work. IDF collaborates with ISO and AOAC International in the development of standard
methods of analysis and sampling for milk and milk products.
Draft International Standards adopted by the Action Teams and Standing Committees are circulated to the National
Committees for voting. Publication as an International Standard requires approval by at least 50 % of National
Committees casting a vote.
International Standard ISO 8968-4IDF 20-4 was prepared by Technical Committee ISO/TC 34, Food products,
Subcommittee SC 5, Milk and milk products, and the International Dairy Federation (IDF), in collaboration with
AOAC International. It is being published jointly by ISO and IDF and separately by AOAC International.
All work was carried out by the Joint ISO/IDF/AOAC Action Team, Nitrogen compounds, under the aegis of its
project leader, Mr D.M. Barbano (US).

© ISO and IDF 2001 – All rights reserved v

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SIST EN ISO 8968-4:2002

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SIST EN ISO 8968-4:2002
ISO 8968-4:2
...