CEN/TS 17743:2022

SLOVENSKI STANDARD
01-maj-2022
Živila - Določevanje ostankov pesticidov z ekstrakcijo z etil acetatom z uporabo
GC- in LC-MS/MS (SweEt)
Foodstuff - Determination of pesticide residues by ethyl acetate extraction using GC- and
LC-MS/MS (SweEt)
Lebensmittel - Bestimmung von Pestizidrückständen mit Ethylacetatextraktion durch GC-
und LC-MS/MS (SweEt)
Produits alimentaires - Dosage des résidus de pesticides par extraction à l’acétate
d’éthyle par GC- et LC-MS/MS (SweEt)
Ta slovenski standard je istoveten z: CEN/TS 17743:2022
ICS:
67.050 Splošne preskusne in General methods of tests and
analizne metode za živilske analysis for food products
proizvode
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17743
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
March 2022
TECHNISCHE SPEZIFIKATION
ICS 67.050
English Version
Foodstuff - Determination of pesticide residues by ethyl
acetate extraction using GC- and LC-MS/MS (SweEt)
Produits alimentaires - Dosage des résidus de Lebensmittel - Bestimmung von Pestizidrückständen
pesticides par extraction à l'acétate d'éthyle par GC- et mit Ethylacetatextraktion durch GC- und LC-MS/MS
LC-MS/MS (SweEt) (SweEt)
This Technical Specification (CEN/TS) was approved by CEN on 7 February 2022 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17743:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and Definitions . 4
4 Principle . 4
5 Reagents . 5
6 Apparatus . 7
7 Procedure . 8
8 Evaluation of results . 10
9 Precision . 11
10 Test report . 12
Annex A (informative) Experimental conditions . 13
A.1 Operating conditions for analysis with LC-MS/MS (ESI+/ESI-) . 13
A.2 Operating conditions for analysis using GC-MS/MS . 14
Bibliography . 17
European foreword
This document (CEN/TS 17743:2022) has been prepared by Technical Committee CEN/TC 275
“Food analysis - Horizontal methods”, the secretariat of which is held by DIN.
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.
WARNING — The application of this Technical Specification can involve hazardous
materials, operations and equipment. This Technical Specification does not claim to
address all the safety problems associated with its use. It is the responsibility of the user of
this Technical Specification to establish appropriate safety and health practices and to
determine the applicability of regulatory limitations prior to use.
Any feedback and questions on this document should be directed to the users’ national standards
body. A complete listing of these bodies can be found on the CEN website.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to announce this Technical Specification: 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.
1 Scope
This document specifies a method for the analysis of pesticide residues in foods of plant and of
animal origin by ethyl acetate extraction using GC- and LC-MS/MS (SweEt).
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.
CEN/TS 17061:2019, Foodstuffs - Guideline for the calibration and quantitative determination of
chromatographic methods for the determination of pesticide residues and organic contaminants
3 Terms and Definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Principle
The method is based on extraction with ethyl acetate followed by determination with liquid
chromatography (LC) and gas chromatography (GC). No clean-up is needed for low fat/oil fruit,
vegetables and cereals or honey. However, for commodities with high fat/oil content, ethyl
acetate/cyclohexane is used for extraction. Furthermore, a clean-up step using gel permeation
chromatography (GPC) is needed. The animal products with low fat/oil content are extracted with
as sorbents.
ethyl acetate followed by clean-up using Primary Secondary Amine (PSA) and C18
For extraction of cereals, acidified ethyl acetate is used, which makes it possible to analyze acidic
pesticides such as phenoxy acids.
Low fat/oil fruits, vegetables and honey: The homogenous sample is extracted with ethyl
acetate after addition of NaHCO . After extraction, Na SO is added to remove water. The sample
3 2 4
extract is centrifuged and filtered prior to injection to GC-MS/MS and LC-MS/MS.
Cereals: The grinded sample is extracted after water addition with acidified ethyl acetate (5.21).
After extraction, Na SO is added to remove water. The sample extract is centrifuged and filtered
2 4
prior to injection to GC-MS/MS and LC-MS/MS.
Animal origin: The homogenous sample is extracted using ethyl acetate or ethyl
acetate + cyclohexane (V1 + V2, 1 + 1). After extraction, Na SO is added to remove water. The
2 4
choice of extraction solvent depends on the fat/oil content of the sample. Samples with a fat/oil
content of a mass fraction ≤ 10 % are extracted with ethyl acetate and purified with the sorbents
PSA and C18 whereas for samples with higher fat/oil content ethyl acetate + cyclohexane (V + V ,
1 2
1 + 1) followed by GPC is used. The sample extract is finally filtered prior to injection to GC-
MS/MS and LC-MS/MS.
Octadecylsilyl chemically bonded silica gel.
5 Reagents
Unless otherwise specified, use reagents of recognized analytical grade. Take every precaution to
avoid possible contamination of water, solvents, sorbents, inorganic salts, etc.
5.1 Water, HPLC quality.
5.2 Methanol, HPLC quality.
5.3 Acetonitrile, HPLC quality.
5.4 Ethyl acetate, pesticide residue grade.
5.5 Cyclohexane, pesticide residue grade.
5.6 Toluene, pesticide residue grade.
5.7 Acetic acid, purity greater than mass fraction ≥ 98 %.
5.8 Ammonia, mass fraction of 25 % NH (approximately 13,4 mol/l).
5.9 Formic acid, mass fraction of 98 % to 100 %.
5.10 Sulphuric acid, mass fraction of 95 % to 97 %.
5.11 Sodium hydroxide.
5.12 Sodium sulphate, Na SO , water free, p.a.
2 4
5.13 Sodium hydrogen monocarbonate, NaHCO , water free, p.a. ®
5.14 BioBeads S-X3 resin, 38 µm to 75 µm (200 to 400 mesh) .
5.15 Primary secondary amino sorbent (PSA).
® 3
EXAMPLE Bondesil-PSA 40 µm Agilent No 12213023 . Other amino sorbents may be used, but
investigations may be necessary to prove equivalency especially regarding analyte losses and pH of the final
extracts.
5.16 C18 sorbent
® 3
EXAMPLE Bondesil-C18 40 µm, Agilent .
®
BioBeads -S-X3 resin, 38 µm to 75 µm (200 to 400 mesh) is the trademark of a product supplied by Bio-
Rad. This information is given for the convenience of users of this document and does not constitute an
endorsement by CEN or CENELEC of the product named. Equivalent products may be used if they can be
shown to lead to the same results.
® ®
Bondesil-PSA 40 µm Agilent No 12213023 and Bondesil-C18 40 µm are the trademarks of products
supplied by Agilent. This information is given for the convenience of users of this document and does not
constitute an endorsement by CEN or CENELEC of the product named. Equivalent products may be used if
they can be shown to lead to the same results.
5.17 Ammonium formate solution (50 mM), pH 4,1.
Add 1,92 ml ± 0,02 ml 98 % formic acid (26 mol/l; 5.9) to 900 ml ± 5 ml water. Adjust the pH
between 4,1 and 4,15 with ammonia (5.8). Dilute 9 parts buffer solution with 1 part water.
The buffer solution is stable up to 3 months at +4 °C.
5.18 Mobile phase A, 10 mmol/l ammonium formate, pH 4,0 to 4,2.
Add 200 ml ± 2 ml (volumetric glass) of 50 mmol/l buffer (5.17) to 800 ml ± 5 ml of water (5.1).
The buffer solution is stable up to 3 months at +4 °C.
5.19 Mobile phase B, Methanol (5.2).
5.20 Wash solution for HPLC, acetonitrile + water, V + V , 80 + 20.
1 2
Add 200 ml ± 2 ml water (5.1) to 800 ml ± 5 ml acetonitrile (5.3).
5.21 Acidified ethyl acetate for extraction, volume fraction of 1 % acetic acid.
Mix 495 ml of ethyl acetate (5.4) with 5 ml acetic acid (5.7).
5.22 Sodium hydroxide, 5 mol/l.
Dissolve 20 g of NaOH (5.11) in approximately 80 ml of water (5.1) and dilute to 100 ml.
5.23 Sodium chloride, NaCl.
5.24 Sulphuric acid, H SO , 2,5 mol/l.
2 4
Mix 7 ml of H SO (5.10) with 50 ml water (5.1).
2 4
5.25 Primary pesticide standards.
Primary standards are purchased with purity > 95 %.
5.26 Pesticide stock solutions.
Stock solutions are prepared in the most suitable solvent with regards to their solubility and
stability.
5.27 Intermediate pesticide working solutions.
Intermediate standard solutions of pesticide mixtures (40 µg/ml) are prepared in methanol,
acetonitrile or toluene.
5.28 Pesticide calibration solutions.
Working solutions used for calibration on LC-MS/MS in fruit and vegetables are prepared in blank
matrix (generic matrix) with low suppression, e.g. banana or carrot. By doing so the matrix effect
can be compensated and the stability of pesticides improved as well.
Working solutions for the calibration on GC-MS/MS are prepared in generic matrix, e.g. cucumber
with no or little enhancement of the signal. True matrix matched working solutions are always
used for the calibration on both types of analytical techniques for cereals and products of animal
origin.
The findings in fruit and vegetables above the maximum residue level (MRL) are always
confirmed against true matrix matched standards.
5.29 GPC eluent and extraction solvent for commodities with high fat/oil content, ethyl
acetate + cyclohexane (V1 + V2, 1 + 1).
6 Apparatus
Usual laboratory apparatus and, in particular, the following:
6.1 Automatic pipettes, suitable for handling volumes of 10 µL to 100 µL, 200 µL to 1 000 µL
and 2 ml to 10 ml.
NOTE Instead of the latter, 10 ml graduated glass pipettes can be used.
6.2 Centrifuge tubes with screw caps, 114 mm × 28 mm, polypropylene (50 ml).
6.3 Volumetric cylinder for ethyl acetate (25 ml).
6.4 Syringes, e.g. 10 ml disposable syringes.
6.5 Syringe filters, 0,20 μm pore size, polytetrafluoroethylene (PTFE) for filtration of final
extracts.
6.6 Injection vials, 1,5 ml suitable for LC and GC auto-samplers.
6.7 Analytical balance, accuracy 0,1 mg.
6.8 Laboratory balance, accuracy 0,01 g.
6.9 Centrifuge.
6.10 Ultrasonic bath.
6.11 Instrument for GPC, equipped with a column, 25 mm internal diameter, 50 cm length, and
5 ml sample loop.
6.12 Mechanical shaker (300 r/min) or a high-speed mechanical shaker, for example from ®
Spex SamplePrep shaking ≥ 1 500 r/min.
6.13 Rotavapor or similar for evaporation.
6.14 Nitrogen evaporator with thermostated water bath.
6.15 Vibration device, e.g. Vortex.
6.16 LC-MS/MS system, see Annex A.
6.17 GC-MS/MS system, see Annex A.
®
A high-speed mechanical shaker from Spex SamplePrep is an example of a suitable product available
commercially. This information is given for the convenience of users of this document and does not
constitute an endorsement by CEN of those products.
7 Procedure
7.1 Sample preparation
7.1.1 Fruit and vegetables
Weigh a test portion of 10,0 g ± 0,1 g (m ) of the homogenous laboratory sample into a 50 ml
sample
centrifuge tube (6.2). For a recovery test (QC sample), add 50 µl to 250 µl of standard solution
(5.27) at this stage. Wait for 5 min before adding 3,0 g ± 0,1 g of sodium hydrogen monocarbonate
(NaHCO , 5.13) and add 20,0 ml ± 0,1 ml ethyl acetate (V , 5.4). Shake vigorously by hand for
3 ex
approximately 30 s and thereafter place the tubes with a mechanical shaker at 300 r/min for
15 min, alternatively at 1 500 r/min for 3 min (6.12). Add 10,0 g ± 0,5 g of sodium sulphate
(Na SO , 5.12) and shake the sample for 1 min. Centrifuge the tubes for 3 min at 3 200 g (6.9).
2 4
Filter the crude extract using a 0,2 µm PTFE syringe filter (6.5). The final extract has a
concentration of 0,50 g/ml sample in ethyl acetate and is analyzed directly by GC- and LC-MS/MS
(6.16, 6.17).
For dried fruit (water content about 20 % or less) and honey, water should be added prior to the
extraction. Weigh e.g. 10 g of sample, add 15 ml ± 0,1 ml cold water, shake for 5 min and extract as
above.
NOTE: To improve phase separation for ex
...