Sample preparation for measurement of mercury level in fluorescent lamps

IEC 62554:2011 specifies sample preparation methods for determining mercury levels in new tubular fluorescent lamps (including single capped, double capped, self-ballasted and CCFL for backlighting) containing 0,1 mg mercury or more. The intended resolution of the methods described in this standard is of the order of 5 %. Mercury level measurement of spent lamps is excluded, as during lamp operation, mercury gradually diffuses into the glass wall and reacts with the glass materials. The test method of this standard does not recover mercury that is diffused into or reacted with or otherwise incorporated irreversibly with the glass wall of discharge tubes. This standard does not contain information on measurement. Measurement is specified in IEC 62321.

Vorbereitung des Prüfmusters zur Messung des Quecksilbergehalts in Leuchtstofflampen

Préparation des échantillons en vue de la mesure du niveau de mercure dans les lampes fluorescentes

La CEI 62554:2011 spécifie les méthodes de préparation des échantillons en vue de la détermination des niveaux de mercure dans des lampes tubulaires à fluorescence (y compris celles à un culot, à deux culots, à ballast incorporé et les CCFL pour le rétro-éclairage) dont la teneur en mercure est de 0,1 mg ou supérieure. La résolution prévue des méthodes décrites dans la présente norme est de l'ordre de 5 %. La mesure du niveau de mercure des lampes usagées est exclue car au cours du fonctionnement de la lampe, le mercure se diffuse progressivement dans la paroi de verre et réagit aux matériaux de verre. La méthode d'essai de la présente norme ne récupère pas le mercure qui s'est diffusé dans la paroi de verre des tubes à décharge ou ayant réagi avec cette paroi de verre ou encore qui s'est incorporé dans celle-ci de manière irréversible. La présente norme ne contient aucune information relative aux mesures. Les mesures sont spécifiées dans la CEI 62321.

Priprava vzorca za merjenje ravni živega srebra v fluorescenčnih sijalkah

Ta mednarodni standard določa metode priprave vzorca za določevanje ravni živega srebra v novih cevnih fluorescenčnih sijalkah (vključno z enim vznožkom, dvojnim vznožkom, z lastno dušilko in CCFL za odbojno prepustnost), ki vsebujejo 0,1 mg živega srebra ali več. Predvidena ločljivost metod, opisanih v tem standardu, je reda 5 %. Merjenje ravni živega srebra iztrošenih sijalk je izvzeto, ker med delovanjem sijalke živo srebro postopoma preide v stekleno steno in reagira s steklenimi materiali. Preskusna metoda tega standarda ne obnovi živega srebra, ki je prešel v stekleno steno iztrošenih sijalk, reagiral z njo ali se kako drugače nepovrnljivo združil z njo. Ta standard ne vsebuje informacij o merjenju. Merjenje je določeno v IEC 62321.

General Information

Status
Published
Publication Date
27-Oct-2011
Drafting Committee
Parallel Committee
Current Stage
6060 - Document made available
Due Date
28-Oct-2011
Completion Date
28-Oct-2011

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SLOVENSKI STANDARD
SIST EN 62554:2012
01-januar-2012
3ULSUDYDY]RUFD]DPHUMHQMHUDYQLåLYHJDVUHEUDYIOXRUHVFHQþQLKVLMDONDK
Sample preparation for measurement of mercury level in fluorescent lamps
Vorbereitung des Prüfmusters zur Messung des Quecksilbergehalts in
Leuchtstofflampen

Préparation des échantillons en vue de la mesure du niveau de mercure dans les lampes

fluorescentes
Ta slovenski standard je istoveten z: EN 62554:2011
ICS:
29.140.30 )OXRUHVFHQþQHVLMDONH6LMDONH Fluorescent lamps.
Discharge lamps
SIST EN 62554:2012 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 62554:2012
---------------------- Page: 2 ----------------------
SIST EN 62554:2012
EUROPEAN STANDARD
EN 62554
NORME EUROPÉENNE
October 2011
EUROPÄISCHE NORM
ICS 29.140.30
English version
Sample preparation for measurement of mercury level in fluorescent
lamps
(IEC 62554:2011)
Préparation des échantillons en vue de la Vorbereitung des Prüfmusters zur
mesure du niveau de mercure dans les Messung des Quecksilbergehalts in
lampes fluorescentes Leuchtstofflampen
(CEI 62554:2011) (IEC 62554:2011)

This European Standard was approved by CENELEC on 2011-09-23. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified

to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,

the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,

Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,

Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62554:2011 E
---------------------- Page: 3 ----------------------
SIST EN 62554:2012
EN 62554:2011 - 2 -
Foreword

The text of document 34A/1484/FDIS, future edition 1 of IEC 62554, prepared by SC 34A, "Lamps", of

IEC TC 34, "Lamps and related equipment" was submitted to the IEC-CENELEC parallel vote and

approved by CENELEC as EN 62554:2011.
The following dates are fixed:
(dop) 2012-06-23
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2014-09-23
• latest date by which the national
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent

rights.
Endorsement notice

The text of the International Standard IEC 62554:2011 was approved by CENELEC as a European

Standard without any modification.
---------------------- Page: 4 ----------------------
SIST EN 62554:2012
- 3 - EN 62554:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year

ISO/IEC 17025 2005 General requirements for the competence of EN ISO/IEC 17025 2005

testing and calibration laboratories
IEC 62321 2008 Electrotechnical products - Determination of EN 62321 2009
levels of six regulated substances (lead,
mercury, cadmium, hexavalent chromium,
polybrominated biphenyls, polybrominated
diphenyl ethers)
ISO 3696 1987 Water for analytical laboratory use - EN ISO 3696 1995
Specification and test methods
---------------------- Page: 5 ----------------------
SIST EN 62554:2012
---------------------- Page: 6 ----------------------
SIST EN 62554:2012
IEC 62554
Edition 1.0 2011-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Sample preparation for measurement of mercury level in fluorescent lamps
Préparation des échantillons en vue de la mesure du niveau de mercure dans
les lampes fluorescentes
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 29.140.30 ISBN 978-2-88912-632-3
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 62554:2012
– 2 – 62554 © IEC:2011
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

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

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

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

4 General ............................................................................................................................ 7

5 Procedure for collecting mercury from a fluorescent lamp ................................................. 7

5.1 General ................................................................................................................... 7

5.2 Reagents ................................................................................................................. 7

5.3 Chemical lab ware ................................................................................................... 8

5.4 Sample preparation ................................................................................................. 8

5.4.1 Cold spotting methods ................................................................................. 8

5.4.2 Sample preparation of fluorescent lamps by non-cold-spot (sectioning)

methods .................................................................................................... 10

5.4.3 Sample preparation of fluorescent lamps by non-cold-spot (crushing)

methods .................................................................................................... 11

5.4.4 Nitric acid rinse method for linear fluorescent lamps .................................. 12

5.4.5 Direct mercury measurement ..................................................................... 12

5.4.6 Sample preparation of other fluorescent lamps .......................................... 13

5.5 Sample digestion ................................................................................................... 13

5.5.1 Ambient conditions .................................................................................... 13

5.5.2 Glass samples (in 250 ml, 500 ml, 1 000 ml or 2 000 ml container) ............ 13

5.5.3 Metal samples (in 125 ml container) .......................................................... 13

5.6 Filtering ................................................................................................................. 14

6 Measurement ................................................................................................................. 14

6.1 Blank test .............................................................................................................. 14

6.2 Data reporting ....................................................................................................... 14

6.3 Analysis ................................................................................................................ 14

Annex A (informative) Electrothermal vaporization atomic absorption spectrometry

(EVAAS) method ................................................................................................................... 15

Annex B (informative) Information on the cold spotting method ........................................... 18

Figure A.1 – Configuration of the electrothermal vaporization atomic absorption

spectrometry testing apparatus ............................................................................................. 15

Figure A.2 – An example of the electrothermal vaporization atomic absorption

spectrometer test apparatus layout ....................................................................................... 16

Figure B.1 – Example of glass cell arrangement ................................................................... 19

Figure B.2 – Example of cooling device arrangement ............................................................ 20

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SIST EN 62554:2012
62554 © IEC:2011 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAMPLE PREPARATION FOR MEASUREMENT
OF MERCURY LEVEL IN FLUORESCENT LAMPS
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in

addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses

arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62554 has been prepared by subcommittee 34A: Lamps, of IEC

technical committee 34: Lamps and related equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
34A/1484/FDIS 34A/1502/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 9 ----------------------
SIST EN 62554:2012
– 4 – 62554 © IEC:2011

The committee has decided that the contents of this publication will remain unchanged until the

stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to

the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct understanding

of its contents. Users should therefore print this document using a colour printer.

---------------------- Page: 10 ----------------------
SIST EN 62554:2012
62554 © IEC:2011 – 5 –
INTRODUCTION

The International Electrotechnical Commission (IEC) draws attention to the fact that it is claimed

that compliance with this document may involve the use of a patent concerning Cold spotting

given in 5.4.1.

IEC takes no position concerning the evidence, validity and scope of this patent right.

The holder of this patent right has assured the IEC that he/she is willing to negotiate licences

free of charge with applicants throughout the world. In this respect, the statement of the holder

of this patent right is registered with IEC. Information may be obtained from:
General Electric Company
Appliance Park AP35-1002, Louisville, KY, 40225-0001, US

Attention is drawn to the possibility that some of the elements of this document may be the

subject of patent rights other than those identified above. IEC shall not be held responsible for

identifying any or all such patent rights.

ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of patents

relevant to their standards. Users are encouraged to consult the data bases for the most up to

date information concerning patents.

According to IEC SMB 136/7 decision, the technical committee decided to remove designation of

a reference method.
---------------------- Page: 11 ----------------------
SIST EN 62554:2012
– 6 – 62554 © IEC:2011
SAMPLE PREPARATION FOR MEASUREMENT
OF MERCURY LEVEL IN FLUORESCENT LAMPS
1 Scope

This International Standard specifies sample preparation methods for determining mercury

levels in new tubular fluorescent lamps (including single capped, double capped, self-ballasted

and CCFL for backlighting) containing 0,1 mg mercury or more. The intended resolution of the

methods described in this standard is of the order of 5 %.

Mercury level measurement of spent lamps is excluded, as during lamp operation, mercury

gradually diffuses into the glass wall and reacts with the glass materials. The test method of this

standard does not recover mercury that is diffused into or reacted with or otherwise incorporated

irreversibly with the glass wall of discharge tubes.

This standard does not contain information on measurement. Measurement is specified in

IEC 62321.
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.

ISO/IEC 17025:2005, General requirements for the competence of testing and calibration

laboratories

IEC 62321:2008, Electrotechnical products – Determination of levels of six regulated

substances (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls,

polybrominated diphenyl ethers)

ISO 3696:1987, Water for analytical laboratory use – Specification and test methods

3 Terms and definitions

For the purposes of the present document, the following terms and definitions apply.

3.1
new lamp
a lamp that has not been energized since manufacture
3.2
cold cathode fluorescent lamp (CCFL) for backlighting

small diameter fluorescent lamp having cold cathode in the lamp, in which most of light is

emitted by the excitation of phosphors coated in discharge tube and used as backlight in LCD

3.3
external electrode fluorescent lamp (EEFL) for backlighting

small diameter fluorescent lamp having cold cathode attached outside the lamp, in which most of

light is emitted by the excitation of phosphors coated in discharge tube and used as backlighting

in LCD
EEFL is a subtype in CCFL lamp group.
---------------------- Page: 12 ----------------------
SIST EN 62554:2012
62554 © IEC:2011 – 7 –
4 General
Mercury in fluorescent lamps exists in the following states:
a) vapour in a lamp;
b) liquid metal;
c) compound;
d) alloy.

There is a wide variety of mercury dosing solutions including appearance and placement of

mercury dispensing devices and also composition and structure of those devices. Although

some of the lamps are dosed with amalgam or solid mercury alloy, there are also many

fluorescent lamps dosed with liquid mercury.

Amalgam dosed lamps often have device(s) that act as an auxiliary amalgam. Form and location

of these devices vary widely as well.

The introduction of a cold spot (see Annex B) minimizes the loss of mercury in the vapour state

when the discharge tube is opened. With the lamp operating, the cold spot will condense all the

mercury in the discharge, allowing superior control for mercury recovery.

The procedure in Clause 5 below includes a method to collect liquid mercury, mercury

compounds and alloys and amalgams.

The total amount of mercury is determined by measuring the amount of liquid mercury, mercury

compounds and alloys and amalgam.

The amount of mercury is calculated from the measured mercury concentration, the volume of

the filtered solution and the dilution factor.
5 Procedure for collecting mercury from a fluorescent lamp
5.1 General

For test arrangement and ambient conditions, relevant parts of ISO/IEC 17025:2005 shall be

followed.

WARNING – Persons using this International Standard should be familiar with normal laboratory

practice. This 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, to avoid pollution of the environment and to ensure compliance with any national

regulatory conditions.
5.2 Reagents
The following reagents shall be used:
– water: Grade 1, as specified in ISO 3696;
– the mass fraction of mercury in the following reagents shall be below 1 × 10 ;
– potassium permanganate 5 % aqueous solution (m/v);
– nitric acid, concentrated 65 %;
– hydrochloric acid, concentrated 37 %;
– hydrofluoric acid, concentrated 40 %.
---------------------- Page: 13 ----------------------
SIST EN 62554:2012
– 8 – 62554 © IEC:2011
5.3 Chemical lab ware
Chemical lab ware shall be verified to be mercury non-absorbing.
Chemical lab ware shall be as follows:
– disposable vacuum filter pack with medium retention filter;

– disposable wide mouth screw-capped plastic bottles: 125 ml, 250 ml, 500 ml, 1 000 ml,

2 000 ml;
– disposable wide mouth sturdy plastic bag nominal 500 ml, 1 000 ml;
– beaker 50 ml, 100 ml, 125 ml, 250 ml, 500 ml;
– volumetric flasks: 50 ml, 100 ml, 250 ml, 500 ml;
– micropipettes;
– dispensers;
– bench coat: sheet of plastic lined laboratory bench paper.

NOTE The plastic bag may be clear polyethylene or similar chemical and acid resistant material nominally 0,01 mm

or thicker. The 1 000 ml bag would be approximately 200 mm × 300 mm. Sometimes known as a “blender or stomacher

bag” they are available from biological laboratory suppliers. Bag size may be adjusted to suit availability and lamp size

being tested.
5.4 Sample preparation

Sample preparation process shall be a continuous operation without excessive hold time.

5.4.1 Cold spotting methods
5.4.1.1 General

Cold spotting is a method for condensing free mercury in a localized position (see Annex B).

The mercury localization occurs while the low-pressure discharge lamp is “ON” under normal

operating conditions while a small area (the cold spot) of the discharge tube is maintained at a

low temperature. During the cold spotting process, no heavy end blackening should be

observed.

When the free mercury is fully condensed, the light output of the lamp will drop significantly and

the discharge colour will typically turn pink. The process of free mercury localization

(cold-spotting) is then completed.

NOTE Mercury collection with cold spot below 0 °C and operating with the normal control gear of the lamp may take

several days.

5.4.1.2 Sample preparation of self-ballasted and single capped compact fluorescent

multi limbed lamps with cold-spotting

Discharge tube cutting operations shall be carried out above the wide mouth screw capped

plastic bottle to minimize the risk of material loss.
Sample containers shall be as follows.

– Use 250 ml wide mouth screw-capped plastic bottle for cold spot section as first container.

– Use 125 ml wide mouth screw-capped plastic bottle for end portions of discharge tube as

second container.

– Use 500 ml or 1 000 ml wide mouth screw-capped plastic bottle for glass parts of discharge

tube, depending on which one fits better to the discharge tube dimensions under test as third

container.
---------------------- Page: 14 ----------------------
SIST EN 62554:2012
62554 © IEC:2011 – 9 –

The sample preparation shall be executed according to the process steps listed below.

a) Separate discharge tube from its outer bulb, if any.
b) Clean the discharge tube with chemical wipe.

c) Mark discharge tube in a non-destructive manner for first sectioning. Mark 3 cm on both

sides of the cold spot.

d) Collect the free mercury with cold spotting – see 5.4.1.1 – until mercury starvation is verified.

e) Remove lamp from cooler. Keep lamp in same position as it was during cold spotting until

sectioning.

f) Place the lamp on cutting table covered by bench coat – with the plastic side up, toward the

lamp.

g) Score and break the discharge tube at the first mark allowing the arc tube to fill with air

slowly so that no fluorescent powder coating of the tube is blown off.

h) Break the lamp fully at the first mark. Score and break the lamp at the other mark around the

cold spot. Place cold spot section (6 cm) immediately into the first container. Close the

container. Shake first container allowing the discharge tube section to crush. Keep the first

container in crushed ice until digestion. Allow 5 min for the floating dust to settle before

continuing. Proceed to 5.5.2 sample digestion with the first container immediately.

i) Next, separate discharge tube from plastic surrounds and associated electronics, if any. Cut

associated lead wires as close to the glass seal as possible. Only the discharge tube will be

used for mercury level measurement.

j) Score and break all tip offs and check for metal parts. Crush tip offs with pliers into the

second container.

k) Score both of the lead wire containing ends of the discharge tube approximately 7 mm from

the end of the tube. Pre-score discharge tube for sectioning, step n) below. Use the minimum

possible number of sections allowing the parts to fit into the third container.

l) Cut lead wire containing ends of the discharge tube at the score using hot rod or hot wire.

m) Check end portions for any hollow glass objects and crush them gently with pliers into the

second container. Carefully avoid touching the content of hollow glass objects with the pliers.

Place the removed end portions – inclusive of metal parts in them – of the discharge tube

into the second container and close the container.

n) Section the discharge tube using hot rod or wire at scores marked in step k) above.

o) Place discharge tube section(s) into the third container.

p) Check bench coat for material chips. Any material on bench coat shall be placed into the

third container. Then, close the third container.

q) Shake the third container allowing the discharge tube sections(s) to crush. Allow 5 min for

the floating dust to settle before continuing.
Samples are ready for digestion. Proceed to 5.5 sample digestion immediately.
5.4.1.3 Sample preparation of linear fluorescent lamps with cold spotting
Sample containers shall be as follows.

– Use 250 ml or 500 ml wide mouth screw-capped plastic bottle for cold spot section as first

container.

– Use 125 ml wide mouth screw-capped plastic bottle for end portions of discharge tube as

second container.

– Use 250 ml, 500 ml , 1 000 ml or 2 000 ml wide mouth screw-capped plastic bottle for glass

parts of discharge tube, depending on which one fits better to the discharge tube dimensions

under test as third container.
---------------------- Page: 15 ----------------------
SIST EN 62554:2012
– 10 – 62554 © IEC:2011

The sample preparation shall be executed according to the process steps listed below.

a) Separate discharge tube from its fragment retention cover, if any.

b) Mark discharge tube in a non-destructive manner for first sectioning. Mark 12 cm from the

labelled end for the initial cut; mark 6 cm on both sides of the cold spot.

c) Collect the free mercury with cold spotting – see 5.4.1.1 – until mercury starvation is verified.

d) Remove lamp from cooler. Keep lamp horizontal until sectioning.

e) Place the lamp on cutting table covered by bench coat – with the plastic side up, toward the

lamp.

f) Score and break the discharge tube at the first mark allowing the arc tube to fill with air

slowly so that no fluorescent powder coating of the tube is blown off.

g) Score and break the lamp at the remaining two marks. Place cold spot section (12 cm)

immediately into the first container. Close the first container. Shake the first container

allowing the discharge tube section to crush. Keep the first container in crushed ice until

digestion. Allow 5 min for the floating dust to settle before continuing. Proceed to the 5.5.2

sample digestion immediately.

h) Next, separate discharge tube from its plastic and metallic surrounds. Cut associated lead

wires as close to the glass seal as possible. Only the discharge tube will be used for mercury

level measurement.

i) Score both of the lead wire containing ends of the discharge tube approximately 7 mm from

the end of the tube. Pre-score discharge tube for sectioning. Use the minimum possible

number of sections allowing the parts to fit into the third container.

j) Section the ends of the discharge tube using hot rod or wire at scores marked. Score and

break tip offs and check for metal parts. Crush tip offs with pliers into the second container.

Check end portions for any hollow glass objects and crush them gently with pliers into the

second container. Carefully avoid touching the content of hollow glass objects with the pliers.

Place the end portions – inclusive of metal parts in them – of the discharge tube into the

second container and close the second container.

k) Section the remaining discharge tube using hot rod or wire at scores marked in step i).

l) Place discharge tube sections into the third container.

m) Check bench coat for material chips. Any material on bench coat shall be placed into the

third container. Then close the third container.

n) Shake the third container allowing the discharge tube to crush. Allow 5 min for the floating

dust to settle before opening.
Samples are ready for digestion. Proceed to 5.5 sample digestion immediately.

5.4.2 Sample preparation of fluorescent lamps by non-cold-spot (sectioning) methods

Sample containers shall be as follows.

– Use 500 ml or 1 000 ml wide mouth screw-capped plastic bottle for glass parts of discharge

tube, depending on which one fits better to the discharge tube dimensions under test as first

container.
– Use 125 ml wide mouth screw-capped plastic bottle for
...

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