Reference test method for release of nickel from all post assemblies which are inserted into pierced parts of the human body and articles intended to come into direct and prolonged contact with the skin

This European Standard specifies a method for simulating the release of nickel from all post assemblies which are inserted into pierced ears and other pierced parts of the human body and articles intended to come into direct and prolonged contact with the skin in order to determine whether such articles are in compliance with the Commission Regulation (EC) No 552/2009 amending Regulation (EC) No 1907/2006 on REACH as regards Annex XVII.
Spectacle frames and sunglasses are excluded from the scope of this European Standard.
NOTE   Spectacle frames and sunglasses are subject to the requirements of EN 16128:2011 which provides an unchanged re-publication of the technical requirements that had previously been specified in EN 1811:1998, but restricted in scope to apply only to spectacle frames and sunglasses.

Referenzprüfverfahren zur Bestimmung der Nickellässigkeit von sämtlichen Stäben, die in durchstochene Körperteile eingeführt werden und Erzeugnissen, die unmittelbar und länger mit der Haut in Berührung kommen

Diese Europäische Norm legt ein Verfahren fest, um die Nickellässigkeit von sämtlichen Stäben, die in durchstochene Ohren und in andere durchstochene Teile des menschlichen Körpers eingeführt werden sowie von Erzeugnissen, die unmittelbar und länger mit der Haut in Berührung kommen, zu bestimmen, um festzustellen, ob diese Erzeugnisse der Verordnung Nr. 552/2009, entsprechen, die die Verordnung (EG) Nr. 1907/2006 des Europäischen Parlaments und des Rates REACH, Anhang XVII, geändert hat.
Brillenfassungen und Sonnenbrillen sind von dem Anwendungsbereich dieser Europäischen Norm ausgeschlossen.
ANMERKUNG   Brillenfassungen und Sonnenbrillen unterliegen den Anforderungen von EN 16128:201x, welche eine ungeänderte Neupublikation der technischen Anforderungen enthält, die ursprünglich in EN 1811:1998 enthalten waren, im Anwendungsbereich jedoch eingeschränkt auf Brillenfassungen und Sonnenbrillen ist.

Méthode d'essai de référence relative à la libération du nickel par les assemblages de tiges qui sont introduites dans les parties percées du corps humain et les produits destinés à entrer en contact direct et prolongé avec la peau

La présente Norme européenne spécifie une méthode pour simuler la libération du nickel par tous les assemblages de tiges insérés dans les oreilles percées et d’autres parties percées du corps humain et les articles destinés à venir en contact direct et prolongé avec la peau dans le but de déterminer si ces articles sont conformes au Règlement (CE) n° 1907/2006 du Parlement européen et du Conseil (REACH), en ce qui concerne le n° 27 de l'Annexe XVII. Les montures de lunettes et les lunettes de soleil sont exclues du domaine d’application de la présente Norme européenne. NOTE Les montures de lunettes et les lunettes de soleil sont soumises aux exigences de l’EN 16128:2011 qui est une réédition inchangée des exigences techniques qui ont été préalablement spécifiées dans l’EN 1811:1998, mais dont le domaine d’application est uniquement limité aux montures de lunettes et aux lunettes de soleil.

Primerjalna preskusna metoda za sproščanje niklja iz izdelkov, vstavljenih v prebodene dele človeškega telesa, in izdelkov, ki so v neposrednem in daljšem stiku s kožo

Ta evropski standard določa metodo za simulacijo sproščanja niklja iz vseh izdelkov, vstavljenih v prebodene dele človeškega telesa, in izdelkov, ki so v daljšem neposrednem stiku s kožo, da se določi, ali so ti izdelki v skladu z Evropsko direktivo 76/769/EGS, kot jo spreminjata direktivi 94/27/ES in 2004/96/ES. PRIPOMBA O PRIPRAVI OSNUTKA: CEN/TC 347/TG 1, ki je obravnavan v končni sprejeti odločitvi Evropske komisije, podpira vključitev naslednjega besedila v področje uporabe tega standarda: Okvirji očal in sončna očala so izključeni s področja uporabe tega evropskega standarda.

General Information

Status
Withdrawn
Publication Date
08-Mar-2011
Withdrawal Date
28-Jul-2015
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
29-Jul-2015

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SLOVENSKI STANDARD
SIST EN 1811:2011
01-september-2011
1DGRPHãþD
SIST EN 1811:1999
SIST EN 1811:1999+A1:2008
3ULPHUMDOQDSUHVNXVQDPHWRGD]DVSURãþDQMHQLNOMDL]L]GHONRYYVWDYOMHQLKY
SUHERGHQHGHOHþORYHãNHJDWHOHVDLQL]GHONRYNLVRYQHSRVUHGQHPLQGDOMãHP
VWLNXVNRåR

Reference test method for release of nickel from post assemblies which are inserted into

pierced parts of the human body and products intended to come into direct and
prolonged contact with the skin

Referenzprüfverfahren zur Bestimmung der Nickellässigkeit von sämtlichen Stäben, die

in durchstochene Körperteile eingeführt werden und Produkten, die unmittelbar und

länger mit der Haut in Berührung kommen

Méthode d'essai de référence relative à la libération du nickel par les assemblages de

tiges qui sont introduites dans les parties percées du corps humain et les produits

destinés à entrer en contact direct et prolongé avec la peau
Ta slovenski standard je istoveten z: EN 1811:2011
ICS:
39.060 Nakit Jewellery
SIST EN 1811:2011 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 1811:2011
---------------------- Page: 2 ----------------------
SIST EN 1811:2011
EUROPEAN STANDARD
EN 1811
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2011
ICS 39.060 Supersedes EN 1811:1998+A1:2008
English Version
Reference test method for release of nickel from all post
assemblies which are inserted into pierced parts of the human
body and articles intended to come into direct and prolonged
contact with the skin

Méthode d'essai de référence relative à la libération du Referenzprüfverfahren zur Bestimmung der Nickellässigkeit

nickel par les assemblages de tiges qui sont introduites von sämtlichen Stäben, die in durchstochene Körperteile

dans les parties percées du corps humain et les produits eingeführt werden und Erzeugnissen, die unmittelbar und

destinés à entrer en contact direct et prolongé avec la peau länger mit der Haut in Berührung kommen

This European Standard was approved by CEN on 5 February 2011.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1811:2011: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 1811:2011
EN 1811:2011 (E)
Contents Page

Foreword ..............................................................................................................................................................4

Introduction .........................................................................................................................................................5

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

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

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

4 Principle of the procedure ....................................................................................................................7

5 Reagents .................................................................................................................................................7

6 Apparatus ...............................................................................................................................................8

7 Samples ..................................................................................................................................................9

7.1 Sample area ............................................................................................................................................9

7.1.1 Definition of sample area ......................................................................................................................9

7.1.2 Determination of sample area ..............................................................................................................9

7.1.3 Masking of areas other than sample area ...........................................................................................9

7.2 Sample degreasing before testing .......................................................................................................9

7.3 Quality control samples ........................................................................................................................9

8 Procedure ............................................................................................................................................ 10

8.1 Preparation of test solution ............................................................................................................... 10

8.2 Release procedure .............................................................................................................................. 10

8.3 Determination of nickel ...................................................................................................................... 11

8.3.1 General ................................................................................................................................................. 11

8.3.2 Calibration solutions .......................................................................................................................... 11

8.3.3 Detection limit and quantification limit ............................................................................................ 11

8.3.4 Number of test samples ..................................................................................................................... 11

8.3.5 Number of replicate measurements.................................................................................................. 11

8.4 Blank tests ........................................................................................................................................... 11

9 Calculations ......................................................................................................................................... 11

9.1 Nickel release ...................................................................................................................................... 11

9.2 Interpretation of results ..................................................................................................................... 12

9.2.1 General ................................................................................................................................................. 12

9.2.2 Assessment of non-compliance ........................................................................................................ 12

9.2.3 Uncertainty budget ............................................................................................................................. 13

10 Test report ........................................................................................................................................... 13

Annex A (informative) Expanded measurement uncertainty of the test procedure and compliance

assessment ......................................................................................................................................... 14

Annex B (normative) Requirements for quality control material ................................................................ 16

Annex C (normative) Requirements for preparation of all post assemblies which are inserted into

pierced parts of the human body and articles intended to come into direct and prolonged

contact with the skin prior to nickel testing .................................................................................... 18

C.1 General ................................................................................................................................................. 18

C.2 Requirements and principle .............................................................................................................. 18

C.3 Determination of the nickel release test method ............................................................................. 18

C.4 Determination of surfaces coming into direct and prolonged contact with the skin or

pierced parts of the body ................................................................................................................... 18

C.4.1 Procedures for homogeneous and inhomogeneous articles ........................................................ 18

C.4.2 Jewellery products ............................................................................................................................. 20

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SIST EN 1811:2011
EN 1811:2011 (E)

C.4.3 Other articles such as textiles, footwear, garments, leather goods and mobile phones ............ 25

C.5 Methods of determining the surface areas ....................................................................................... 26

C.5.1 Surface area measurements .............................................................................................................. 26

C.5.2 Minimum surface area ......................................................................................................................... 26

C.5.3 Simplification of surface area determination using common shapes of consumer

products ............................................................................................................................................... 26

C.6 Testing apparatus prior to nickel release testing ............................................................................ 26

Annex D (informative) Articles made from composite materials ................................................................. 28

Bibliography ...................................................................................................................................................... 29

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SIST EN 1811:2011
EN 1811:2011 (E)
Foreword

This document (EN 1811:2011) has been prepared by Technical Committee CEN/TC 347 “Methods for

analysis of allergens”, 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 September 2011, and conflicting national standards shall be

withdrawn at the latest by March 2013.

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, together with EN 16128:2011, supersedes EN 1811:1998 +A1:2008.

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

European Free Trade Association.

This document supports essential requirements of Commission Regulation (EC) No 1907/2006 (REACH) of

the European Parliament and the Council.

List of the significant technical changes that have been made in this new version of EN 1811 in comparison

with the former edition EN 1811:1998+A1:2008:

The scope of the former European Standard was divided: EN 1811:2011 is applicable for all products but

spectacle frames and sunglasses; EN 16128:2011 is applicable for spectacle frames and sunglasses;

List of the significant technical changes of EN 1811:2011 as compared to the former European Standard:

• The scope was expanded to include all post assemblies which are inserted into pierced parts of the

human body;
• The preparation of the test solution was tested and changed;

• The correction factor was eliminated and the concept of measurement uncertainty introduced;

• The Standard contains a new normative Annex C on the preparation of articles prior to nickel testing;

EN 16128:2011 is technically unchanged as compared to the former European Standard

EN 1811:1998+A1:2008.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.,
---------------------- Page: 6 ----------------------
SIST EN 1811:2011
EN 1811:2011 (E)
Introduction

Adverse skin reaction to nickel has been known for many decades. Nickel is the most frequent cause of

contact allergy in Europe, and 10 % to 20 % of the patch tested female population and 1 % to 3 % of the patch

tested male population are allergic to nickel. Skin absorption of nickel ions, which are released from some

nickel-containing materials which are inserted into pierced ears or other pierced parts of the human body or

which are in direct and prolonged contact with the skin, causes sensitisation. Further exposure to soluble

nickel salts results in allergic contact dermatitis. It is known that sensitisation to nickel requires higher

exposure levels than does the elicitation in already sensitised individuals. There is a large variation in the

degree of sensitivity to nickel between individuals. This widespread health problem has forced the introduction

of a number of measures designed to reduce its prevalence. These measures include the requirements of this

standard which provides an in-vitro chemical test that correlates as far as possible with the variable human

biological reactions that occur when metallic articles containing nickel are in direct and prolonged contact with

the skin and pierced parts of the body. The standard provides a measure of the amount of nickel release from

an article immersed for one week in artificial sweat. The standard also describes the preparation of a quality

control material intended to assist a laboratory in achieving an acceptable precision.

Clinical patch-testing of a small selection of nickel-containing alloys and coatings on nickel-sensitized persons

indicates that high and low results achieved with the present analytical method correspond closely with

patch-test reactivity. Moreover, a nickel migration limit of 0,5 µg/cm /week for articles intended to come into

direct and prolonged contact with the skin and a nickel migration limit of less than 0,2 µg/cm /week for all post

piercing assemblies inserted into pierced ears and other pierced parts of the human body has been set in

Commission Regulation (EC) No 1907/2006 of the European Parliament and the Council (in the current

version).
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SIST EN 1811:2011
EN 1811:2011 (E)
1 Scope

This European Standard specifies a method for simulating the release of nickel from all post assemblies which

are inserted into pierced ears and other pierced parts of the human body and articles intended to come into

direct and prolonged contact with the skin in order to determine whether such articles are in compliance with

No. 27 Annex XVII of Regulation (EC) No 1907/2006 of the European Parliament and of the Council

(REACH).

Spectacle frames and sunglasses are excluded from the scope of this European Standard.

NOTE Spectacle frames and sunglasses are subject to the requirements of EN 16128:2011 which provides an

unchanged re-publication of the technical requirements that had previously been specified in EN 1811:1998, but restricted

in scope to apply only to spectacle frames and sunglasses.
2 Normative references

The following referenced documents are indispensable for the application 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 12472, Method for the simulation of wear and corrosion for the detection of nickel release from coated

items

EN ISO 3696:1995, Water for analytical laboratory use  Specification and test methods (ISO 3696:1987)

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
barrette
component used to secure the watchstrap to the case
3.2
homogeneous
consisting of a single material having a common surface finish
3.3
post assembly
ear stud or body piercing article
3.4
release solution
solution resulting from the release procedure according to 8.2
3.5
representative

best estimate for the effective release rate of all surfaces which are in direct and prolonged contact with the

skin or pierced parts of the body under normal conditions of use
NOTE This property is defined with respect to the release rate.
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SIST EN 1811:2011
EN 1811:2011 (E)
3.6
sample area

surface(s) that is(are) immersed in the test solution and not covered with a masking agent

3.7
test solution
solution as prepared according to 8.1
3.8
watch crown
winder used to alter the time/date
4 Principle of the procedure

The article to be tested for nickel release is placed in an artificial sweat test solution for one week. The

concentration of dissolved nickel in the solution is determined by an appropriate analytical method, for

example inductively-coupled plasma spectrometry. The nickel release is expressed in micrograms per square

centimetre per week (µg/cm /week).

NOTE Indicative information on the extent of nickel release can be obtained by performing one of the tests specified

in CR 12471.
5 Reagents

Except where indicated, all reagents shall be of recognized pro analysis, p.a., grade or better and shall be free

of nickel.
5.1 Deionised water according to EN ISO 3696:1995, grade 2.
5.2 Sodium chloride.
5.3 DL-lactic acid, ρ = 1,21 g/ml, > 88 % (m/m).
5.4 Urea.
5.5 Sodium hydroxide in solid tablets, min 98 % pure dehydrate.
5.6 Preparation of 1 M sodium hydroxide solution.

Weigh 4 g ± 0,01 g of sodium hydroxide (5.5) and transfer into a 100 ml beaker and add 50 ml of deionised

water (5.1). Stir and cool to room temperature. Transfer the solution to a 100 ml volumetric flask and make up

to volume with deionised water (5.1).
5.7 Preparation of 0,1M sodium hydroxide solution.

Add 25 ml of 1 M sodium hydroxide (5.6) in a 250 ml volumetric flask and make up to volume with deionised

water (5.1).
5.8 Hydrochloric acid, ρ = 1,16 g/ml, 32 % v/v.
5.9 Preparation of 0,1 M hydrochloric acid solution.

Transfer 10 ml of hydrochloric acid (5.8) into a 100 ml volumetric flask and make up to volume with deionised

water (5.1).
---------------------- Page: 9 ----------------------
SIST EN 1811:2011
EN 1811:2011 (E)
5.10 Nitric acid, ρ = 1,40 g/ml, 65 % (m/m).
5.11 Dilute nitric acid, approximately 5 % (m/m).

Transfer 30 ml of nitric acid (5.10) into a 500-ml beaker containing about 350 ml of deionised water (5.1). Stir

and cool to room temperature. Transfer the solution to a 500-ml volumetric flask and make up to volume with

deionised water.
5.12 Degreasing solution.

Dissolve 5 g of an anionic surface-active agent such as sodium dodecylbenzene sulfate or sodium alkylaryl

sulfate in 1 000 ml deionised water (5.1). An appropriately diluted, neutral, commercially available detergent

may be used.

5.13 Wax or lacquer (suitable for electroplating purposes) capable of protecting a surface from nickel

release.

The wax or lacquer shall be shown to prevent nickel release from a nickel-releasing surface when one or more

coats of the wax or lacquer are applied in the same manner as on a test sample and shall not affect the nickel

content of the release solution. The suitability of the wax / lacquer shall be tested.

NOTE Information on sourcing of a suitable wax or lacquer is available from the CEN/CENELEC Management

Centre.
6 Apparatus
6.1 A pH-meter, accurate to ± 0,05 pH.

6.2 An analytical instrument capable of detecting a concentration of 0,01 mg nickel per litre in the final

release solution.

It is recommended that either an inductively-coupled plasma spectrometer (ICP-OES, optical emission, or

ICP-MS, mass spectrometer) or an electro thermal excitation atomic absorption spectrometer (GFAAS) is

used.

6.3 Thermostatically controlled water-bath or oven with or without cooling option, capable of

maintaining a temperature of (30 ± 2) °C.

6.4 A vessel with lid, both composed of a non-metallic, nickel-free and nitric-acid-resistant material, such

as glass and/or polypropylene and/or polytetrafluoroethylene and/or polystyrene.

The sample shall be suspended in the liquid by a holder made from the same materials as listed above, so as

to avoid contact of the sample area (7.1.1) with the walls and base of the vessel. The size and shape of vessel

and holder shall be chosen so as to minimize the volume of test solution required to completely cover the

article to be tested.

In order to remove any trace of nickel, the vessel and holder shall be pre-treated by being stored in a solution

of dilute nitric acid (5.11) for at least 4 h. After acid cleaning, rinse the vessel and holder with deionised water

and dry.

6.5 Device for length measuring, for example a digital calliper with a minimum resolution of 50 µm or a

micrometer with a minimum resolution of 5 µm.
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SIST EN 1811:2011
EN 1811:2011 (E)
7 Samples
7.1 Sample area
7.1.1 Definition of sample area

Only the surface(s) that come(s) into direct and prolonged contact with the skin and/or that have contact with

the pierced parts of the body shall be tested (sample area).

In case of articles which are made of uniform material(s), consideration should be given to testing the whole

surface (whether or not it is all in direct and prolonged contact with the skin or with pierced parts of the body)

since errors can be introduced by the masking process (see 7.1.3).

The test laboratory shall refer to C.4 in order to determine which surfaces are to be tested.

7.1.2 Determination of sample area

Determination of the sample area (a) in square centimetres is achieved by marking the contour of the sample

area assuming that the article is worn or used as intended (refer to Annex C) and measuring it by an

appropriate measuring device (6.5). In order to achieve the required degree of analytical sensitivity, a

minimum sample area of 0,2 cm shall be tested. If necessary, identical articles may be tested together to

obtain this minimum area.

The closer the nickel release is to the limits laid down in the regulation, or the smaller the sample area is, the

more precise the surface measurement needs to be.
7.1.3 Masking of areas other than sample area

In order to prevent release of nickel from areas other than the sample area, such areas shall be removed or

protected from the test solution. This can be achieved after degreasing (refer to 7.2) by the application of one

or more coatings of a wax or lacquer (5.13) which has been shown to protect from nickel release.

The test laboratory shall refer to C.4 in order to determine which surfaces are to be tested.

7.2 Sample degreasing before testing

Gently swirl the sample for 2 min in degreasing solution (5.12) at room temperature. Rinse thoroughly with

deionised water and dry using an absorbing cloth. After degreasing, articles shall be handled with plastic

forceps or clean protective gloves.

NOTE This cleaning stage is intended to remove extraneous grease and skin secretions due to handling, but not any

protective coatings.
7.3 Quality control samples

As a quality control check, the nickel release from a quality control sample shall be determined (refer to

Annex B) on a frequent basis.

The quality control sample shall be degreased in the same way as the sample according to 7.2 and shall be

used only once.
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SIST EN 1811:2011
EN 1811:2011 (E)
8 Procedure
8.1 Preparation of test solution
The test solution consists of deionised water (5.1) containing:
 0,5 % (m/m) sodium chloride (5.2);
 0,1 % (m/m) lactic acid (5.3);
 0,1 % (m/m) urea (5.4); and
 1 M (5.6) and 0,1 M (5.7) sodium hydroxide solution.
The test solution shall be prepared as follows:

Pour 900 ml of freshly prepared deionised water (5.1) to a 1 000 ml beaker. Add 1,00 ± 0,01 g of urea (5.4),

5,00 ± 0,05 g of sodium chloride (5.2) and 1,00 ± 0,01 g of lactic acid (5.3), and stir until dissolved.

Calibrate a pH meter in accordance with the manufacturer’s instructions using freshly prepared buffer

solutions.

Immerse the pH electrode into the test solution and measure the pH. Slowly and gently, add drop by drop a

volume of 1 M sodium hydroxide (5.6) until a pH of 5,5 ± 0,05 is reached and subsequently with continuous

stirring, add slowly and gently drop by drop a volume of 0,1 M sodium hydroxide (5.7) until a pH 6,5 ± 0,05 is

reached and remains stable.

Measure the pH after 10 min from the last addition of 0,1 M sodium hydroxide to ensure that the pH is in the

range 6,5 ± 0,05.

Transfer the solution to a 1 000 ml volumetric flask and make up to volume with deionised water. Before use,

ensure that the pH of the test solution is in the range of pH 6,5 ± 0,05.

If it is necessary to reduce the pH of the solution to 6,5 ± 0,05 before testing, this shall be done by adding

slowly and gently with continuous stirring drop by drop a volume of 0,1 M hydrochloric acid (5.9).

The test solution shall be prepared daily.
8.2 Release procedure

NOTE In the following text the term "test solution" represents the solution as prepared according to 8.1, the "release

solution" is the solution resulting from the release procedure. See also definitions.

Place the sample, suspended by its holder, in the test vessel (6.4). Add an amount of test solution

corresponding to approximately 1 ml per cm sample area. The suspended sample area shall be totally

immersed. It is not necessary to immerse areas which are completely protected by wax or lacquer (see 7.1.3).

The minimum volume of test solution shall be 0,5 ml irrespective of the surface area. Note the sample area

and the amount of the test solution used. Close the vessel with a tight lid in order to prevent evaporation of the

test solution. Leave the vessel undisturbed in a thermostatically controlled water-bath or oven (6.3) at

(30 ± 2)°C for (168 ± 2) h without agitation.

The quality control sample (7.3) shall be determined and suspended in an appropriate volume of test solution.

It shall be treated in the same manner as a sample.

After (168 ± 2) h, slowly remove the sample from the release solution. To collect solution contained in cavities

of the sample, the sample shall be turned appropriately. The sample shall not be rinsed.

---------------------- Page: 12 ----------------------
SIST EN 1811:2011
EN 1811:2011 (E)

Quantitatively transfer the release solution to an appropriately sized volumetric flask washed with dilute nitric

acid (5.11). In order to prevent redeposition of dissolved nickel, add dilute nitric acid (5.11), to achieve a

concentration of about 1 % nitric acid, when the flask is made up to volume (V in ml) using the test solution.

The choice of volumetric flask size shall take into account the sensitivity of the instrumentation used for the

nickel determination (refer to 6.2). The minimum final volume to which the release solution may be diluted is

2 ml.

Filtering should be avoided if possible as the expected concentration change and the possibility of

contamination can influence the result.

Test solution shall be stored in a refrigerator below 10 °C if used in the preparation of calibration solutions.

8.3 Determination of nickel
8.3.1 General

Determine the nickel content of the release solution using an analytical spectrometer (refer to 6.2).

For the determination of nickel using an analytical spectrometer the following procedures shall be applied.

8.3.2 Calibration solutions

The calibration solutions used for the nickel determination shall match the matrix of the test solution plus any

added nitric acid and adequately cover the concentrat
...

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