General methods of tests for pigments and extenders - Part 28: Determination of total content of polychlorinated biphenyls (PCB) by dissolution, cleanup and GC-MS (ISO 787-28:2019)

This document specifies a method for determining the total content of polychlorinated biphenyls (PCBs), checking for all 209 possible congeners in pigment materials.
This document is applicable to a working range from1 mg/kg to 150 mg/kg. The lower quantitation limit of this method is 1 mg/kg per congener. Results below 1 mg/kg are considered to be qualitative only.

Allgemeine Prüfverfahren für Pigmente und Füllstoffe - Teil 28: Bestimmung des Gesamtgehalts an polychlorierten Biphenylen in organischen Pigmenten durch Auflösung, Reinigung und GC/MS (ISO 787-28:2019)

Dieses Dokument legt ein Verfahren zum Bestimmen des Gesamtgehaltes an polychlorierten Biphenylen (PCB) fest, mit dessen Hilfe auf alle 209 möglichen Kongenere in Pigmentmaterialien zu prüfen ist.
Dieses Dokument gilt für einen Arbeitsbereich von 1 mg/kg bis 150 mg/kg. Der untere Quantifizierungsgrenzwert dieses Verfahrens liegt bei 1 mg/kg je Kongener. Ergebnisse unterhalb von 1 mg/kg werden nur als qualitativ angesehen.

Méthodes générales d'essai des pigments et matières de charge - Partie 28: Détermination de la teneur totale en biphényles polychlorés dans les pigments organiques par dissolution, purification et CG-SM (ISO 787-28:2019)

Le présent document spécifie une méthode de détermination de la teneur totale en biphényles polychlorés (PCB) en vérifiant la présence de chacun des 209 congénères possibles dans les matières pigmentaires.
Le présent document est applicable à une plage de travail de 1 mg/kg à 150 mg/kg. La limite inférieure de quantification de cette méthode est de 1 mg/kg par congénère. Les résultats inférieurs à 1 mg/kg sont considérés comme étant uniquement qualitatifs.

Splošne preskusne metode za pigmente in polnila - 28. del: Določevanje celotnih polikloriranih bifenilov (PCB) z raztapljanjem, čiščenjem in plinsko kromatografijo z masno selektivnim detektorjem (GC-MS) (ISO 787-28:2019)

General Information

Status
Published
Public Enquiry End Date
01-Jul-2020
Publication Date
27-Oct-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Oct-2020
Due Date
17-Dec-2020
Completion Date
28-Oct-2020

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SLOVENSKI STANDARD
SIST EN ISO 787-28:2020
01-december-2020
Splošne preskusne metode za pigmente in polnila - 28. del: Določevanje celotnih

polikloriranih bifenilov (PCB) z raztapljanjem, čiščenjem in plinsko kromatografijo

z masno selektivnim detektorjem (GC-MS) (ISO 787-28:2019)

General methods of tests for pigments and extenders - Part 28: Determination of total

content of polychlorinated biphenyls (PCB) by dissolution, cleanup and GC-MS (ISO 787

-28:2019)
Allgemeine Prüfverfahren für Pigmente und Füllstoffe - Teil 28: Bestimmung des
Gesamtgehalts an polychlorierten Biphenylen in organischen Pigmenten durch
Auflösung, Reinigung und GC/MS (ISO 787-28:2019)
Méthodes générales d'essai des pigments et matières de charge - Partie 28:
Détermination de la teneur totale en biphényles polychlorés dans les pigments
organiques par dissolution, purification et CG-SM (ISO 787-28:2019)
Ta slovenski standard je istoveten z: EN ISO 787-28:2020
ICS:
71.040.50 Fizikalnokemijske analitske Physicochemical methods of
metode analysis
87.060.10 Pigmenti in polnila Pigments and extenders
SIST EN ISO 787-28:2020 en,fr,de

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

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SIST EN ISO 787-28:2020
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SIST EN ISO 787-28:2020
EN ISO 787-28
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2020
EUROPÄISCHE NORM
ICS 87.060.10
English Version
General methods of tests for pigments and extenders - Part
28: Determination of total content of polychlorinated
biphenyls (PCB) by dissolution, cleanup and GC-MS (ISO
787-28:2019)

Méthodes générales d'essai des pigments et matières Allgemeine Prüfverfahren für Pigmente und Füllstoffe -

de charge - Partie 28: Détermination de la teneur totale Teil 28: Bestimmung des Gesamtgehalts an

en biphényles polychlorés dans les pigments polychlorierten Biphenylen (PCB) durch Auflösung,

organiques par dissolution, purification et CG-SM (ISO Reinigung und GC/MS (ISO 787-28:2019)

787-28:2019)
This European Standard was approved by CEN on 28 September 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

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

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 787-28:2020 E

worldwide for CEN national Members.
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SIST EN ISO 787-28:2020
EN ISO 787-28:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 787-28:2020
EN ISO 787-28:2020 (E)
European foreword

The text of ISO 787-28:2019 has been prepared by Technical Committee ISO/TC 256 "Pigments,

dyestuffs and extenders” of the International Organization for Standardization (ISO) and has been taken

over as EN ISO 787-28:2020 by Technical Committee CEN/TC 298 “Pigments and extenders” the

secretariat of which is held by DIN.

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 April 2021, and conflicting national standards shall be

withdrawn at the latest by April 2021.

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.

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, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 787-28:32018 has been approved by CEN as EN ISO 787-28:2020 without any

modification.
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SIST EN ISO 787-28:2020
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SIST EN ISO 787-28:2020
INTERNATIONAL ISO
STANDARD 787-28
First edition
2019-05
General methods of tests for pigments
and extenders —
Part 28:
Determination of total content of
polychlorinated biphenyls (PCB) by
dissolution, cleanup and GC-MS
Méthodes générales d'essai des pigments et matières de charge —
Partie 28: Détermination de la teneur totale en biphényles polychlorés
dans les pigments organiques par dissolution, purification et CG-SM
Reference number
ISO 787-28:2019(E)
ISO 2019
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SIST EN ISO 787-28:2020
ISO 787-28:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 787-28:2020
ISO 787-28:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 2

5 Sampling ........................................................................................................................................................................................................................ 2

6 Procedure..................................................................................................................................................................................................................... 2

6.1 General ........................................................................................................................................................................................................... 2

6.2 Clean-up to eliminate interfering species ........................................................................................................................ 3

6.3 Separation and quantification ................................................................................................................................................... 3

7 Reagents ........................................................................................................................................................................................................................ 3

7.1 Safety precautions ................................................................................................................................................................................ 3

7.2 Reagents, solvents and absorbents........................................................................................................................................ 4

7.3 Internal reference materials for PCBs, 13C12-labelled ....................................................................................... 5

7.4 Cleaning/disposal agents ............................................................................................................................................................... 5

8 Apparatus ..................................................................................................................................................................................................................... 5

9 Procedure..................................................................................................................................................................................................................... 6

9.1 Preparation of test sample ............................................................................................................................................................ 6

9.2 Liquid-liquid extraction .................................................................................................................................................................. 7

9.2.1 Separation funnel ............................................................................................................................................................ 7

9.2.2 Ludwig extraction ........................................................................................................................................................... 8

9.3 Clean-up ........................................................................................................................................................................................................ 8

9.3.1 General...................................................................................................................................................................................... 8

9.3.2 Diatomaceous earth-sulfuric acid column (optional) ...................................................................... 8

9.3.3 Gel permeation (size exclusion) chromatography/porous styrene

divinylbenzene beads-column (optional) .................................................................................................. 9

9.3.4 Multilayer columns (obligatory) .....................................................................................................................10

9.3.5 Alumina column (optional) .................................................................................................................................11

9.4 Preparation of GC solution and GC procedure ..........................................................................................................11

9.5 Calculation and quantitation procedure ........................................................................................................................12

10 Test report ................................................................................................................................................................................................................14

Annex A (informative) Nomenclature of PCBs .........................................................................................................................................15

Bibliography .............................................................................................................................................................................................................................21

© ISO 2019 – All rights reserved iii
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SIST EN ISO 787-28:2020
ISO 787-28:2019(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 256, Pigments, dyestuffs and extenders.

A list of all parts in the ISO 787 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at https: //www .iso .org/members .html.

iv © ISO 2019 – All rights reserved
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SIST EN ISO 787-28:2020
ISO 787-28:2019(E)
Introduction

A number of methods to quantify PCBs in “environmental samples” or oil residues prove inadequate for

pigments due to being merely extractive on the particle surface without taking into account occlusions

of contaminants in the crystal lattice of pigments (see References [1] to [3]).

Occurrence and formation principles are referred to in References [5], [6] and [8].

© ISO 2019 – All rights reserved v
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SIST EN ISO 787-28:2020
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SIST EN ISO 787-28:2020
INTERNATIONAL STANDARD ISO 787-28:2019(E)
General methods of tests for pigments and extenders —
Part 28:
Determination of total content of polychlorinated
biphenyls (PCB) by dissolution, cleanup and GC-MS
1 Scope

This document specifies a method for determining the total content of polychlorinated biphenyls

(PCBs), checking for all 209 possible congeners in pigment materials.

This document is applicable to a working range from1 mg/kg to 150 mg/kg. The lower quantitation limit

of this method is 1 mg/kg per congener. Results below 1 mg/kg are considered to be qualitative only.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

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

ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling

ISO 18451-1, Pigments, dyestuffs and extenders — Terminology — Part 1: General terms

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 18451-1 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
polychlorinated biphenyls
PCB

209 congeners, from mono- through deca-chlorinated biphenyls, which may be subdivided into homologue

groups comprising PCB congeners with the same degree of chlorination, i.e. same gross formula

Note 1 to entry: The general CAS-Number for polychlorinated biphenyls is 1336-36-3. For a comprehensive

congener list with CAS-Numbers, see Annex A or Reference [5].
3.2
internal reference material

mixture of defined quantities of C-Isotope-labelled PCBs added directly into the freshly weighed

pigment sample

Note 1 to entry: No subsequent additions of internal reference materials are permitted. Surrogate standards

reference materials can be added to assess recovery rates only, but these cannot be deemed an internal reference

materials, nor can these be used for quantitation.
© ISO 2019 – All rights reserved 1
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SIST EN ISO 787-28:2020
ISO 787-28:2019(E)

Note 2 to entry: Mass spectrometry assumes a vast linear range of detector sensitivity, thus a calibration with a

single quantity will usually suffice.

Note 3 to entry: In case of major deviations between analytes and reference material concentrations, the

quantitation might need to be confirmed by a second analysis (from the beginning) using an adequately adapted

sample weight.
4 Principle
The principles have been developed from References [1] to [4], [6] and [7].

The use of solid surface extraction methods risks underestimating the actual content by orders of

magnitude. Such errors are often further enhanced when the PCBs quantitation is carried out by using

external or internal reference materials which do not undergo the same losses as the analytes that are

occluded in the crystal lattice of the pigment.
5 Sampling

Take a representative sample of the product to be tested, as described in ISO 15528.

Samples shall be of dry powder consistency. Volatiles should be less than 1 % (mass fraction),

determined with a sample portion separated from the sample portions used for PCB analyses.

Samples shall be kept in the dark and in capped glass bottles or vials.

Samples suspected of having high impurities content shall be handled in dedicated glassware and

kept separately from other laboratory equipment; sample mass may be reduced and internal reference

materials amounts doubled in order to cope with the possible elevated levels of interferences by

impurities. A screening pre-run is recommended to avoid detector overload.

Bromine detection or presence of partially brominated samples (e.g. C.I. Pigment Red 168, C.I. Pigment

Green 36) require caution due to occurrence of “mixed” halogenated aromatic compounds. Analysis can

proceed if results are checked for non-interference (see 9.5).
6 Procedure
6.1 General
This method requires a strict sequential application of the following steps:
— sample weighing;
— addition of internal reference material and thorough mixing;

— dissolution in concentrated sulfuric acid from 92 % (mass fraction) to 95 % (mass fraction);

— sonicate the mixture until fully dissolved and a homogenous dark solution is obtained in the

sulfuric acid phase. The temperature shall be kept lower than 50 °C at all times, e.g. by circulating

or continuously exchanging the water in the sonication bath.

NOTE 1 Using this concentration range avoids major disintegration and rearrangement of mono- and

bichlorinated biphenyls.

NOTE 2 Sufficient dissolution is indicated by absence of the “tyndall-effect” (i.e. no scattering of a preferably

blue light beam by the solution).

Upon dissolution in concentrated sulphuric acid, pigment molecules are protonated and may be

considered in a simplified way as being pulled out of their crystal lattice one by one in drawer-

like fashion, until all the solid matter has dissolved, without cleavage occurring at the molecular

(chromophor) level.
2 © ISO 2019 – All rights reserved
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SIST EN ISO 787-28:2020
ISO 787-28:2019(E)

Any possible inadvertent destruction of analytes is likely to occur also to the internal reference

materials at a related, nearly equal rate, thus compensating for any destructive effects, at the expense

of a slightly lower signal-to-noise ratio (see Reference [5]). There maybe a slightly increased rate of

destruction for low chlorinated biphenyls.
This may be offset by a preceding leaching step as described in the Note to 9.1.
6.2 Clean-up to eliminate interfering species

Interfering species such as aryl sulfuric acids, carboxylic acids, esters, polymeric surfactants,

heterocyclic compounds are eliminated by a cleanup performed by sequential wet column-

chromatography.
6.3 Separation and quantification

(Optional) separation from PCDD/PCDF, (which may be later eluated and analysed), as well as from

other interfering substances on an alumina column.

Final separation and quantitation by gas chromatography (GC) using MS detection mode (see 8.18).

The application of a 60 m column (see 8.3) will ensure that most PCB congeners are separated or

recognizable at different retention times.

Exceptionally a 30 m column may be used for screening. The instrument should comprise automatic

flow and pressure control, programmable temperature controls and auto sampling equipment (see 8.2).

MS detector should preferably be operated in SIM-mode.

NOTE SIM is the most suitable mode for quantitation. SCAN is best for qualitative identification of the

signals, but suffers from reduced sensitivity.

Quantitation is achieved by using the ratio of peak areas of analytes (identified as analyte by three or

more specific mass traces as “qualifiers”) versus the corresponding internal standards areas, to cope

with overlapping ranges of chlorination groups and residual interfering peaks.

There are no intentional chemical reactions except for the dissolution step, which incurs protonation

merely to cleave the crystal lattice, as all other steps are merely physical ones.

Chemical reaction leading to decay of analytes are considered to occur with both the internal reference

material and the analytes alike, assuming full compensation of the resultant error. It is therefore

essential to use internal reference materials matching the congeners distribution profile of the sample

to a relatively high degree. Other approaches to assess artefacts in detail (see example in Reference [1])

shall be mentioned in the test report.
7 Reagents
7.1 Safety precautions

In case of spillage, apply 30 VA ultraviolet lamp for irradiation of spillage areas (254 nm wavelength

emitted power maximum).

Staff is required to be qualified for and familiar with handling of hazardous substances in the laboratory.

All material, solvents, reagents, and standards shall be handled with appropriate care. Laboratory

facilities, equipment and personnel shall comply with the latest legal and safety standards on

PCB handling as may be locally applicable.

Upon accidental skin contact with PCB, triply wipe skin area with polyethylene glycol-wetted cloth (to

be disposed of) and see emergency medical services immediately.
© ISO 2019 – All rights reserved 3
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SIST EN ISO 787-28:2020
ISO 787-28:2019(E)

Major droplet spillages may result in shutdown of the entire laboratory facilities. Protect eyes when

applying UV-lamp irradiation after spillages for decomposing contaminants.
7.2 Reagents, solvents and absorbents

Only reagents and solvents of acknowledged and certified analytical grade for pesticide analyses or

comparable grades shall be used.

Solvents shall be used as delivered. New column adsorbents shall be purged by shaking in and decanting

off dichloromethane (or a similarly suitable solvent), followed by drying under suitable cover.

7.2.1 Sulphuric acid, 92 % to 95 % (mass fraction).
7.2.2 Phosphoric acid, p.a., 85 % (mass fraction).
7.2.3 Diatomaceous earth.
7.2.4 Silica gel, 63 mesh to 200 mesh.
7.2.5 Aluminium oxide (alumina) (Basic, Activity: Super 1).
7.2.6 Silver nitrate, p.a., ultrapure.
7.2.7 Cesium hydroxide, hemihydrate.
7.2.8 Sodium sulfate, p.a., granulated.

NOTE Sodium sulfate (anhydrous) is used to eliminate residual aqueous and alcoholic matter in the hexane

phase, as this can have detrimental effects on the GC column materials.
7.2.9 Porous styrene divinylbenzene beads for size exclusion chromatography.
7.2.10 n-Hexane.
7.2.11 Dichloromethane.
7.2.12 Toluene.
7.2.13 n-Nonane.
7.2.14 Ethanol.
7.2.15 Ethyl acetate.
7.2.16 Cyclohexane.

Original reference solutions shall be diluted by a factor 5 or 2 (MBP-MXP), using n-nonane, octane or

similar high-boiling, non-aromatic solvents. Dilution should be carried out filling up vial content to

2 or 5 times its mass by adding the solvent. The error due to slightly different densities of reference

concentrate and pure solvent is <0,5 %, hence negligible.
4 © ISO 2019 – All rights reserved
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SIST EN ISO 787-28:2020
ISO 787-28:2019(E)
7.3 Internal reference materials for PCBs, 13C12-labelled

— PCB cong. ## 3, 15, 28, 52, 118, 153, 180, 194, 208, 209: LGC/Cambridge #CIL-EC-4189

— PCB cong. ## 3, 8, 28, 52, 101, 118, 138, 153, 180, 194, 206, 209: Wellington-CAMPRO # MBP-MXP

— PCB cong. ## 3, 8, 28, 52, 101, 114, 118, 138, 153, 180, 194, 206, 209: LGC/Cambridge #CIL-EC 5411

These internal reference materials or similar are recommended with respect to the requirement

of a “reporting threshold” value of 2 mg/kg for any resolvable PCB peak, covering in principle all

209 congeners.

Optional: To assess low-chlorinated biphenyls (Mono-CB-s, Di-CB-s) in detail, the user may counter-

check these by using a spiking series for the particular homologue groups.
7.4 Cleaning/disposal agents

All glassware shall be purged with a suitable solvent prior to use and then washed intensively with a

high-alkaline detergent or soap with readily soluble anionic and phosphate-containing surfactants in

order to exclude any source of cross contamination. Joint grease shall be excluded from the laboratory.

New glassware shall be purged by shaking in and decanting off dichloromethane (or a similarly suitable

solvent), followed by drying under suitable cover.

Decontamination soap, brushes for all glassware, discharge bins (separate waste streams); polyethylene

glycol pharmaceutical grade as first aid in case of skin contamination.
8 Apparatus

8.1 Glassware, equipped with B (NS) 29 ground joints only as standard and inverse joint geometry.

8.2 Column (for the clean-up procedure), 30 cm long, 14 mm internal diameter, B (NS) 29/32 shells,

250 ml top reservoir as integral part and PTFE stop cock at the bottom of the column.

8.3 Capillary column (for the gas chromatographic determination) of 60 meters length, internal

diameter 0,25 mm coated with 0,25 µm thick film of 5 % phenylmethylsiloxane equivalent to a phenyl

arylene polymer with the following characteristics:
— non-polar with very low bleed characteristics, ideal for GC-MS;
— excellent inertness for active compounds;

— improved signal-to-noise ratio for better sensitivity and mass spectral integrity;

— bonded and cross-linked;
— solvent rinsable to separate most of the 209 PCB congeners.

NOTE “Fast GC” permitted for particular congeners to be sought (i.e. a selection of the spectrum of 209

congeners for special purposes, to be mentioned in the final report).
8.4 Round-bottomed flasks, B (NS) 29, 1 000 ml, 500 ml and 250 ml.
8.5 Flat-bottomed flasks, 100 ml.
8.6 Cylinders, calibrated, 100 ml and 500 ml.

1) Examples of suitable products available commercially. This information is given for the convenience of users

of this document and does not constitute an endor
...

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