EN 15742:2020

SLOVENSKI STANDARD
01-maj-2020
Nadomešča:
SIST EN 15742:2009
Krma: metode vzorčenja in analize - Določevanje OCP z GC/ECD
Animal feeding stuffs: Methods of sampling and analysis - Determination of OCPs by
GC/ECD
Futtermittel - Probenahme- und Untersuchungsverfahren - Bestimmung von OCP mittels
GC-ECD
Aliments des animaux: Méthodes d'échantillonnage et d'analyse - Dosage des pesticides
organochlorés (POC) par CPG/ECD
Ta slovenski standard je istoveten z: EN 15742:2020
ICS:
65.120 Krmila Animal feeding stuffs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 15742
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2020
EUROPÄISCHE NORM
ICS 65.120 Supersedes EN 15742:2009
English Version
Animal feeding stuffs: Methods of sampling and analysis -
Determination of OCPs by GC-ECD
Aliments des animaux: Méthodes d'échantillonnage et Futtermittel - Probenahme- und
d'analyse - Dosage des pesticides organochlorés (POC) Untersuchungsverfahren - Bestimmung von OCP
par CPG/ECD mittels GC-ECD
This European Standard was approved by CEN on 6 January 2020.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15742:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Principle . 6
5 Reagents and materials . 6
6 Apparatus . 12
7 Sampling . 14
8 Preparation of test sample . 14
9 Procedure. 14
9.1 General . 14
9.2 Extraction . 14
9.3 Clean-up procedure . 15
9.4 Gas chromatography . 15
10 Calculation and expression of results . 16
10.1 Calibration criteria . 16
10.2 Identification and confirmation. 16
10.3 Calculation . 16
10.4 Recovery . 18
10.5 Identification and confirmation. 18
11 Precision . 18
11.1 Interlaboratory test . 18
11.2 Repeatability and precision within participating laboratories . 19
11.3 Reproducibility and precision between participating laboratories . 19
12 Test report . 20
13 Important considerations for this method . 21
13.1 Alternative extraction techniques . 21
13.2 Amount of silica . 21
13.3 Internal standards . 21
Annex A (informative) Results of interlaboratory tests . 22
Bibliography . 23

European foreword
This document (EN 15742:2020) has been prepared by Technical Committee CEN/TC 327 “Animal
feeding stuffs: 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 September 2020, and conflicting national standards shall
be withdrawn at the latest by September 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15742:2009.
In comparison with the previous edition, the following technical modifications have been made:
The analysis of polychlorinated biphenyls (PCBs) has been removed from this standard as current
legislation on maximum limits requires sensitivity that cannot be provided by GC-ECD. Additionally,
editorial changes were made.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
This document was developed in response to Directive 2002/32/EC of the European Parliament and the
Council of 7 May 2002 on undesirable substances in animal feed.
The previous edition of this document (EN 15742:2009) was fully validated by means of a collaborative
study for aldrin, dieldrin, endrin, p,p’-DDT, o,p’-DDT, p,p’-TDE, pp-DDE, alpha-endosulfan, beta-
endosulfan, HCB, alpha-HCH, beta-HCH and gamma-HCH. Attempts in the framework of the third Mandate
from the European Commission to CEN/TC 327 to perform additional validation of the method through
a full collaborative study (2017) for photo heptachlor, cis/trans nonachlor and keto-endrin were
unsuccessful as no more than three laboratories volunteered to send in results [1].
WARNING — The use of this document can involve hazardous materials, operations and
equipment. This standard does not purport to address all the safety problems associated with its
use. It is the responsibility of the user of this European Standard to establish appropriate safety
and health practices and determine the applicability of regulatory limitations prior to use.
1 Scope
This document specifies a gas chromatographic method with electron capture detection (ECD) for the
determination of organochlorine pesticides (OCPs) in compound feeds and oil and fats.
The method is applicable to animal compound feed, oils and fats and fish meals with a water content up
to about 20 % by weight and oil/fatty samples containing residues of one or more of the following OCPs,
toxaphene and some of their isomers and degradation products:
— aldrin;
— dieldrin;
— dichlorodiphenyltrichloroethane (DDT) (the isomers 'op'-DDT', 'pp'-DDT', 'pp'-TDE' ('pp'-DDD'), and
'pp'-DDE');
— endosulfan (as the sum of α-/β-isomers);
— endrin;
— hexachlorobenzene (HCB);
— hexachlorocyclohexane isomers α-HCH (α-BHC), β-HCH (β-BHC), γ-HCH (γ-BHC or lindane);
For the following OCPs, the method is considered a screening method. Additional in-house validation is
required for reporting validated data.
— chlordane (as the sum of chlordane isomers and oxychlordane);
— endosulfan-sulphate;
— delta-keto-endrin;
— heptachlor (as the sum of heptachlor and heptachlor epoxide);
— photo-heptachlor;
— cis- and trans-nonachlor.
A limit of quantification (LOQ) for the mentioned OCPs of 5 µg/kg is intended to be obtained. However,
10 µg/kg applies for heptachlor, aldrin, endrin, dieldrin, and endosulfan (α-/β– and sulphate). Individual
laboratories are responsible for ensuring that the equipment that they use, achieves these limits of
quantifications. The LOQs apply to the individual OCPs.
2 Normative references
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.
EN ISO 6498, Animal feeding stuffs - Guidelines for sample preparation (ISO 6498)
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 https://www.iso.org/obp
3.1
limit of detection
smallest measured content, from which it is possible to deduce the presence of the analyte with
reasonable statistical certainty
Note 1 to entry: The limit of detection is numerically equal to three times the standard deviation of the mean of
blanc determinations (n > 10).
3.2
limit of quantification
lowest content of the analyte which can be measured with reasonable statistical certainty
Note 1 to entry: If both accuracy and precision are constant over a concentration range around the limit of
detection, then the limit of quantification is numerically equal to 6 times the standard deviation of the mean of blanc
determinations (n > 10).
4 Principle
In order to check for the presence of OCPs, a test portion of animal feeding stuff is fortified with internal
standard (PCB 198), and is extracted with ethyl acetate. The extract is concentrated and subsequently
purified by:
— gel permeation chromatography (GPC), with cyclohexane or ethyl acetate as eluting solvent;
— chromatography on partially deactivated silica gel.
The collected fraction containing the compounds of interest is concentrated and re-dissolved in a solution
containing another internal standard (PCB 209) as a reference standard. After clean up, the analytes are
measured using GC-ECD. Identification is done on the basis of comparing retention times on capillary
columns of different polarity. Quantification is done using the internal standard method.
5 Reagents and materials
...