Safety of toys - Part 12: N-Nitrosamines and N-nitrosatable substances

This European Standard specifies the requirements and test methods for N nitrosamines and N nitrosatable substances for:
   toys and parts of toys made from elastomers and intended for use by children under 36 months;
   toys and parts of toys made from elastomers and intended to be placed in the mouth;
   finger paints for children under 36 months.
EXAMPLES   Examples of toys made from elastomers are balloons and teethers.

Sicherheit von Spielzeug - Teil 12: N-Nitrosamine und N-nitrosierbare Stoffe

Diese Europäische Norm legt die Anforderungen und Prüfverfahren zu N-Nitrosaminen und N-nitrosierbaren Stoffen für folgendes Spielzeug fest:
   Spielzeug und Spielzeugteile aus Elastomeren, die für die Verwendung durch Kinder unter 36 Monaten vorgesehen sind;
   Spielzeug und Spielzeugteile aus Elastomeren, die in den Mund genommen werden sollen;
   Fingermalfarben für Kinder unter 36 Monaten.
BEISPIEL   Luftballons und Beißringe sind Beispiele für Spielzeug aus Elastomeren.
ANMERKUNG   Im Hinblick auf Elastomere wurden N-Nitrosamine und N-nitrosierbare Stoffe bis jetzt hauptsächlich in vulkanisierten Materialien nachgewiesen.

Sécurité des jouets - Partie 12 : N-Nitrosamines et substances N-nitrosables

La présente Norme européenne spécifie les exigences et les méthodes d’essai relatives aux N nitrosamines et aux substances N-nitrosables pour :
   les jouets et parties de jouets en élastomères et destinés à être utilisés par des enfants de moins de 36 mois ;
   les jouets et parties de jouets en élastomères et destinés à être mis en bouche ;
   les peintures au doigt destinées aux enfants de moins de 36 mois.
EXEMPLES   Les ballons de baudruche et les anneaux de dentition sont des exemples de jouets en matériaux élastomères.
NOTE   Concernant les élastomères, les N-nitrosamines et les substances N-nitrosables ont été jusqu’à présent principalement détectées dans des matériaux vulcanisés.

Varnost igrač - 12. del: N-nitrozamini in N-nitrozabilne snovi

Ta evropski standard določa zahteve in preskusne metode za N-nitrozamine in N-nitrozabilne snovi za: igrače in dele igrač, izdelane iz elastomerov in namenjene uporabi s strani otrok, mlajših od 36 mesecev; igrače in dele igrač, izdelane iz elastomerov in namenjene vstavljanju v usta; prstne barve za otroke, mlajše od 36 mesecev. PRIMERI   Igrače, ki so narejene iz elastomerov, so baloni in grizala.

General Information

Status
Published
Publication Date
20-Dec-2016
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
21-Dec-2016
Completion Date
21-Dec-2016

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SLOVENSKI STANDARD
SIST EN 71-12:2017
01-april-2017
1DGRPHãþD
SIST EN 71-12:2013
9DUQRVWLJUDþGHO1QLWUR]DPLQLLQ1QLWUR]DELOQHVQRYL
Safety of toys - Part 12: N-Nitrosamines and N-nitrosatable substances
Sicherheit von Spielzeug - Teil 12: N-Nitrosamine und N-nitrosierbare Stoffe
Sécurité des jouets - Partie 12 : N-Nitrosamines et substances N-nitrosables
Ta slovenski standard je istoveten z: EN 71-12:2016
ICS:
97.200.50 ,JUDþH Toys
SIST EN 71-12:2017 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 71-12:2017
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SIST EN 71-12:2017
EN 71-12
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2016
EUROPÄISCHE NORM
ICS 97.200.50 Supersedes EN 71-12:2013
English Version
Safety of toys - Part 12: N-Nitrosamines and N-nitrosatable
substances

Sécurité des jouets - Partie 12 : N-Nitrosamines et Sicherheit von Spielzeug - Teil 12: N-Nitrosamine und

substances N-nitrosables N-nitrosierbare Stoffe
This European Standard was approved by CEN on 30 October 2016.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 71-12:2017 E

worldwide for CEN national Members.
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SIST EN 71-12:2017
EN 71-12:2016 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 6

4 Requirements ................................................................................................................................................... 7

4.1 Requirements for finger paints .................................................................................................................. 7

4.2 Requirements for elastomers ..................................................................................................................... 7

5 Principle ............................................................................................................................................................. 8

6 Reagents and apparatus ............................................................................................................................... 8

6.1 Reagents ............................................................................................................................................................. 8

6.2 Standards ........................................................................................................................................................... 9

6.3 Apparatus ........................................................................................................................................................ 10

7 Sample preparation ..................................................................................................................................... 11

7.1 General ............................................................................................................................................................. 11

7.2 Finger paints .................................................................................................................................................. 11

7.2.1 N-nitrosamines.............................................................................................................................................. 11

7.2.2 N-nitrosatable substances ........................................................................................................................ 12

7.3 Elastomers ...................................................................................................................................................... 12

7.3.1 Sample preparation for balloons............................................................................................................ 12

7.3.2 Sample preparation for other toys or parts of toys than balloons ............................................. 12

7.3.3 Nitrosation ...................................................................................................................................................... 13

7.3.4 Preparation of solution for determination of N-nitrosamines by HPLC-MS/MS ................... 13

8 Methods of analysis ..................................................................................................................................... 13

8.1 General ............................................................................................................................................................. 13

8.2 HPLC chromatographic conditions ........................................................................................................ 14

8.3 MS/MS conditions ........................................................................................................................................ 14

8.4 Confirmation of detected N-nitrosamines ........................................................................................... 15

9 Calculation of results for N-nitrosamines and N-nitrosatable substances .............................. 16

9.1 Finger paint .................................................................................................................................................... 16

9.1.1 General ............................................................................................................................................................. 16

9.1.2 N-nitrosamines.............................................................................................................................................. 16

9.1.3 N-nitrosatable substances ........................................................................................................................ 17

9.2 Elastomers ...................................................................................................................................................... 17

9.2.1 General ............................................................................................................................................................. 17

9.2.2 N-nitrosamines.............................................................................................................................................. 18

9.2.3 N-nitrosatable substances ........................................................................................................................ 18

10 Method performance .................................................................................................................................. 19

10.1 Finger paints .................................................................................................................................................. 19

10.1.1 Repeatability, reproducibility and measurement uncertainty ................................................... 19

10.1.2 Limits of detection (LOD) and quantification (LOQ) ....................................................................... 19

10.2 Elastomers ...................................................................................................................................................... 19

10.2.1 Repeatability, reproducibility and measurement uncertainty ................................................... 19

10.2.2 Limits of detection and quantification ................................................................................................. 20

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SIST EN 71-12:2017
EN 71-12:2016 (E)

11 Test report ...................................................................................................................................................... 21

Annex A (informative) Background and rationale for this European Standard ................................. 22

A.1 Definition of elastomer ............................................................................................................................... 22

A.2 Requirements for finger paints (see 4.1) ............................................................................................. 22

A.3 Requirements for elastomers (see 4.2) ................................................................................................ 23

A.4 Avoidance N-nitrosamines in finger paints ......................................................................................... 24

A.5 Explanation for decision to do static migration for elastomers and for the specified

migration times ............................................................................................................................................. 24

A.6 Reference to other standards and relevant deviations .................................................................. 25

A.7 Conditions for nitrosation ......................................................................................................................... 25

A.8 NDELA in balloons ........................................................................................................................................ 26

A.9 Selection of N-nitrosamines specified in this standard .................................................................. 26

Annex B (informative) Significant technical changes between this European Standard and

the previous version .................................................................................................................................... 27

Annex C (informative) A–deviations ................................................................................................................... 29

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of EU Directive 2009/48/EC aimed to be covered ............................................... 30

Bibliography ................................................................................................................................................................. 31

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SIST EN 71-12:2017
EN 71-12:2016 (E)
European foreword

This document (EN 71-12:2017) has been prepared by Technical Committee CEN/TC 52 “Safety of

toys”, the secretariat of which is held by DS.

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 2017, and conflicting national standards shall be

withdrawn at the latest by June 2017.

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 71-12:2013.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive 2009/48/EC.

For relationship with EU Directive 2009/48/EC, see informative Annex ZA, which is an integral part of

this document.

Additional information on the rationale for various requirements is given in Annex A. Annex B provides

details of significant technical changes between this European Standard and the previous edition.

This European Standard constitutes the 12th part of the European Standard on safety of toys.

This European Standard for safety of toys consists of the following parts:
— Part 1: Mechanical and physical properties;
— Part 2: Flammability;
— Part 3: Migration of certain elements;
— Part 4: Experimental sets for chemistry and related activities;
— Part 5: Chemical toys (sets) other than experimental sets;
— Part 7: Finger paints — Requirements and test methods;
— Part 8: Activity toys for domestic use;
— Part 9: Organic chemical compounds — Requirements;
— Part 10: Organic chemical compounds — Sample preparation and extraction;
— Part 11: Organic chemical compounds — Methods of analysis;
— Part 12: N-nitrosamines and N-nitrosatable substances;

— Part 13: Olfactory board games, gustative board games, cosmetic kits and gustative kits;

— Part 14: Trampolines for domestic use.
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SIST EN 71-12:2017
EN 71-12:2016 (E)

NOTE 1 In addition to the above parts of EN 71, the following guidance documents have been published: CEN

Technical Report CEN/TR 15071, Safety of toys — National translations of warnings and instructions for use in

EN 71, and CEN Technical Report CEN/TR 15371 (all parts), Safety of toys — Interpretations.

NOTE 2 Words in italics are defined in Clause 3 (Terms and definitions).

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, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
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SIST EN 71-12:2017
EN 71-12:2016 (E)
1 Scope

This European Standard specifies the requirements and test methods for N-nitrosamines and N-

nitrosatable substances for:

— toys and parts of toys made from elastomers and intended for use by children under 36 months;

— toys and parts of toys made from elastomers and intended to be placed in the mouth;

— finger paints for children under 36 months.
EXAMPLE Examples of toys made from elastomers are balloons and teethers.

NOTE With regard to elastomers, up to now N-nitrosamines and N-nitrosatable substances have mainly been

detected in vulcanized materials.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696)

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
finger paint

aqueous semi-solid or liquid, coloured mixture specially designed for children to apply directly to

suitable surfaces with the fingers and hands
[SOURCE: EN 71-7:2014, definition 3.1]
3.2
elastomer

flexible cross-linked macro-molecular material which returns rapidly to approximately its initial

dimensions and shape after substantial deformation by stress and release of the stress at room

temperature

Note 1 to entry: Not all elastomers are likely to contain N-nitrosamines and N-nitrosatable substances. For

further guidance on possible sources of N-nitrosamines and N-nitrosatable substances in elastomers the term

elastomer and other related aspects see A.1.

[SOURCE: EN ISO 472:2013, 2.327, modified: the phrases “flexible cross-linked”, “approximately” and

“at room temperature” and note 1 to entry added and the phrase “a weak” deleted]
3.3
N-nitrosamine

substance characterised by the -N-N=O functional group, usually formed by the reaction of an amine

with a nitrosating agent at acidic pH
Note 1 to entry: The reacting amines primarily are secondary amines.
Note 2 to entry: An example for a nitrosating agent is nitrite.
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SIST EN 71-12:2017
EN 71-12:2016 (E)
3.4
N-nitrosatable substance

substance which when released into the test solution undergoes nitrosation to form a N-nitrosamine

under specified conditions
4 Requirements
4.1 Requirements for finger paints

The concentration of N-nitrosamines in finger paints shall not exceed 0,02 mg/kg when tested in

accordance with 7.2 and Clause 8, calculated as sum of all detected N-nitrosamines according to 9.1.

The migration of N-nitrosatable substances from finger paints shall not exceed 1 mg/kg of toy material,

calculated as sum of all detected N-nitrosamines after nitrosation.

At least the substance in Table 1 shall be determined in finger paint. If there are indications of the

presence of other N-nitrosamines, they shall also be determined.
Table 1 — List of N-nitrosamines in finger paints
Name of the substance CAS number Abbreviation
N-nitrosodiethanolamine 1116–54–7 NDELA
4.2 Requirements for elastomers

The migration of N-nitrosamines (calculated as sum of all detected N-nitrosamines according to 9.2) and

of N-nitrosatable substances (calculated as sum of all detected N-nitrosamines after nitrosation) from

toys or parts of toys shall not exceed the limit values specified in Table 2 when tested in accordance

with 7.3 and Clause 8.
Table 2 — Limit values for elastomers
Product type N-nitrosamines N-nitrosatable substances
mg/kg mg/kg
a) toys intended for use by
children under 36 months and
0,01 0,1
intended or likely to be placed
into the mouth
b) toys intended for use by
children under 36 months not 0,05 1
covered by a)
c) toys intended for use by
children of 36 months and over
0,05 1
and intended to be placed into
the mouth
d) balloons 0,05 1

At least the substances in Table 3 shall be determined in elastomers. If there are indications of the

presence of other N-nitrosamines they shall also be determined.
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SIST EN 71-12:2017
EN 71-12:2016 (E)
Table 3 — List of N-nitrosamines in elastomers
Name of the substance CAS number Abbreviation
N-nitrosodiethanolamine 1116–54–7 NDELA
N-nitrosodimethylamine 62–75–9 NDMA
N-nitrosodiethylamine 55–18–5 NDEA
N-nitrosodipropylamine 621–64–7 NDPA
N-nitrosodiisopropylamine 601–77–4 NDiPA
N-nitrosodibutylamine 924–16–3 NDBA
N-nitrosodiisobutylamine 997–95–5 NDiBA
N-nitrosodiisononylamine 1207995–62–7 NDiNA
(N-Nitroso-N,N-di(3,5,5-
trimethylhexyl)amine))
N-nitrosomorpholine 59–89–2 NMOR
N-nitrosopiperidine 100–75–4 NPIP
N-nitrosodibenzylamine 5336–53–8 NDBzA
N-nitroso-N-methyl-N- 614–00–6 NMPhA
phenylamine
N-nitroso-N-ethyl-N-phenylamine 612–64–6 NEPhA
5 Principle

N-nitrosamines and N-nitrosatable substances migrate into a test solution. N-nitrosatable substances are

converted to N-nitrosamines by acidification. The final test solutions are analysed for N-nitrosamines by

a suitable validated analytical technique. The N-nitrosamines and N-nitrosatable substances are

expressed in mg/kg of sample.

The test solution for N-nitrosamines in finger paints is water. The test solution for N-nitrosatable

substances in finger paints and for N-nitrosamines and N-nitrosatable substances in elastomers is saliva

test solution.
6 Reagents and apparatus
6.1 Reagents

Unless otherwise specified, all reagents shall be of analytical grade and distilled water, or water of

equivalent purity conforming to at least grade 3 of EN ISO 3696.
6.1.1 Sodium hydrogen carbonate (CAS 144-55-8)
6.1.2 Sodium chloride (CAS 7647-14-5)
6.1.3 Potassium carbonate (CAS 584-08-7)
6.1.4 Sodium nitrite (CAS 7632-00-0)
6.1.5 Hydrochloric acid (CAS 7647-01-0), aqueous solution, c(HCL) = 0,1 mol/l
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SIST EN 71-12:2017
EN 71-12:2016 (E)
6.1.6 Sodium hydroxide (CAS 1310-73-2), aqueous solution, c(NaOH) = 0,1 mol/l
6.1.7 Saliva test solution

Dissolve (4,2 ± 0,021) g of the sodium hydrogen carbonate (6.1.1), (0,5 ± 0,002 5) g of the sodium

chloride (6.1.2), (0,2 ± 0,001 0) g of the potassium carbonate (6.1.3) and (0,03 ± 0,000 15) g of the

sodium nitrite (6.1.4) in water and dilute to (950 ± 5) ml with water. Adjust to pH 9,0 ± 0,1 if necessary

by adding the hydrochloric acid solution (6.1.5) or sodium hydroxide solution (6.1.6) drop by drop.

Transfer into a 1 l volumetric flask and dilute to the mark with water.

This solution has a limited stability. Saliva test solution kept for more than five days shall not be used.

6.1.8 Hydrochloric acid solution, c(HCL) = 1 mol/l.
6.1.9 Sodium hydroxide solution, c(NaOH) = 1 mol/l.
6.1.10 Methanol, ≥ 99,9 %, HPLC-grade.
6.1.11 Formic acid, ≥ 99,5 %, LC-MS grade.
6.1.12 Eluent A: 0,1 % (volume fraction) formic acid in water.
6.1.13 Eluent B: 0,1 % (volume fraction) formic acid in methanol.
6.2 Standards

N-nitrosamines are degraded by ultraviolet light. Exposure of extracts or standards to sources such as

sunlight or fluorescent tube light should be avoided. The standards shall be protected by wrapping in

aluminium foil or using amber glassware and stored in the dark at a temperature of (5 ± 3) °C.

WARNING — N-nitrosamines can endanger human health owing to their toxicity. Persons using this

European Standard should be familiar with normal laboratory practice. This European Standard does

not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of

the user to establish appropriate safety and health practices and to ensure compliance with any

national regulatory conditions.
6.2.1 N-nitrosamines or their solutions, with known purities.

6.2.2 Internal standard, d8-N-nitrosodiethanolamine (d8-NDELA), with known purity.

6.2.3 Internal standard, d6-N-nitrosodimethylamine (d6-NDMA), with known purity.
6.2.4 Stock solution of N-nitrosamines

Prepare a stock solution containing 10 mg/l of each N-nitrosamine (6.2.1) in methanol (6.1.10). This

solution shall be stored in the absence of light at (−18 ± 3) °C.

NOTE Certified N-nitrosamines standards can be purchased from several suppliers including storage and

stability information.
6.2.5 Solutions of internal standards
6.2.5.1 Stock solution of internal standards for elastomers

Prepare a stock solution containing 1 mg/l d8-NDELA (6.2.2) and 1 mg/l d6-NDMA (6.2.3) in methanol

(6.1.10). This solution shall be stored in the absence of light at (−18 ± 3) °C.
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SIST EN 71-12:2017
EN 71-12:2016 (E)
6.2.5.2 Working solution of internal standards for finger paints

Prepare an internal standard working solution containing 1 mg/l d8-NDELA (6.2.2) in water. This

solution has a stability of one day.
6.2.6 Calibration solutions
6.2.6.1 Calibration solutions for N-nitrosamines in finger paints

Prepare five calibration solutions by diluting the stock solution of the N-nitrosamines (6.2.4) and the

working solution of d8-NDELA (6.2.5.2) with water. The concentrations of the calibration solutions shall

be 0,001 mg/l, 0,002 mg/l, 0,005 mg/l, 0,010 mg/l and 0,020 mg/l. Each solution shall contain

0,010 mg/l of d8-NDELA. These solutions have a stability of one day.
6.2.6.2 Calibration solutions for N-nitrosatable substances in finger paints

Prepare at least five calibration solutions by diluting the stock solutions of the N-nitrosamines (6.2.4)

with saliva test solution (6.1.7). The concentration range of the calibration solutions shall be 0,001 mg/l

to 0,05 mg/l. To 1 ml of each solution, add 0,020 ml of the internal standards stock solution containing

d8-NDELA and d6-NDMA (6.2.5.1). Shake to mix the solutions. These solutions have a stability of one

day.
6.2.6.3 Calibration solutions for elastomers

Prepare at least five calibration solutions by diluting the stock solutions of the N-nitrosamines (6.2.4)

with saliva test solution (6.1.7). The concentration range of the calibration solutions shall be

0,000 2 mg/l to 0,05 mg/l. To 1 ml of each solution, add 0,020 ml of the internal standards stock

solution containing d8-NDELA and d6-NDMA (6.2.5.1). Shake to mix the solutions. These solutions have

a stability of one day.
6.3 Apparatus

Laboratory equipment that can come into contact with the sample shall be free from N-nitrosamines.

Standard laboratory equipment and equipment appropriate for applying the test method shall be used.

The following equipment could be used when applying the test method specified in this standard.

6.3.1 Vortex mixer
6.3.2 Shaking machine
6.3.3 Centrifuge, capable of achieving not less than 20 000 g
6.3.4 Glass balls
6.3.5 Conical flask, made of amber glass
6.3.6 Oven, capable of maintaining a temperature of (40 ± 2) °C
6.3.7 High performance liquid chromatography apparatus coupled with tandem mass
spectrometry equipped with atmospheric pressure ionization (APCI)
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SIST EN 71-12:2017
EN 71-12:2016 (E)

6.3.8 Analytical reversed phase HPLC column, C18, for example Macherey-Nagel, Nucleodur C18

Sphinx®, column length 50 mm, internal diameter 3 mm, particle size 1,8 μm. Another phase that

proved to be suitable is porous graphitic carbon, PGC, for example Thermo Scientific HyperCarb®

NOTE Using these HPLC columns and the conditions given in 8.2 NDELA was not eluted within the void

volume. When using another column it needs to be ensured that NDELA has sufficient retention and does not elute

within the void volume of the column used. Due to the fact that the two given columns exhibit a different retention

mechanism they can be used complementary to solve possible chromatographic problems, e.g. poor separation of

NDBA/NDiBA or certain interferences with matrix peaks (such matrix peaks are known for example for

NDBA/NDiBA or NDBzA when using low resolution mass spectrometry).
6.3.9 Membrane filter, membrane made of polyester
7 Sample preparation
7.1 General

Other determination methods than HPLC-MS/MS might require modifications of this procedure after

the migration. For nitrosation, it is mandatory to use the given volume ratios of sample solution,

hydrochloric acid and sodium hydroxide as well as the given time and temperature.

N-nitrosamines are degraded by ultraviolet light. If samples are stored prior to analysis, they shall be

sealed airtight (e.g. in a suitable sized container or wrapped in aluminium foil) and stored in the dark at

temperature below 25 °C. The contamination of samples shall be avoided, e.g. avoiding the cross-

contamination between samples.
NOTE Similar conditions are appropriate for sampling and transport.

Exposure of samples, extracts, migrates or standard solutions to sources such as sunlight or fluorescent

tube light shall be avoided. All extracts, migrates and standard solutions shall be protected by wrapping

in aluminium foil or using amber glassware. If not analysed directly after preparing extracts, migrates

and standard solutions shall be stored in the dark at a temperature of (5 ± 3) °C.

For analysis of finger paints and elastomers a method blank should be prepared and analysed to check if

there are any blank values. For NDELA, blank values have been reported which originated from the

HPLC-vials used. This could be avoided by prewashing the HPLC-vials with ethanol or by irradiating the

vials with UV light (8.4). In the case of N-nitrosamines being detected in the blank sample their source

shall be investigated and removed before analysing samples.
7.2 Finger paints
7.2.1 N-nitrosamines
Finger paints shall be homogenized by mixing (for example using a glass rod).

Weigh about 1,0 g of the sample (note the exact mass) into a sample tube, add 0,20 ml of d8-NDELA

working solution (6.2.5.2) and add 18,8 ml water. After vortexing for about 1 min, shake continuously

for approximately 15 min on a shaking machine (6.3.2). Centrifuge the sample solution at

approximately 4 000 g for about 15 min. Transfer a portion of the supernatant into a second sample

tube and centrifuge at approximately 20 000 g for about 15 min. If necessary, filter the supernatant

through a membrane filter which will not retain analytes.
This information is given for the convenience
...

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