Soil quality - Leaching procedures for subsequent chemical and ecotoxicological testing of soil and soil-like material - Part 2: Batch test using a liquid to solid ratio of 10 l/kg dry matter (ISO 21268-2:2019)

This Standard specifies a test providing information on leaching of soil and soil materials under the experimental conditions specified hereafter, and particularly at a liquid to solid ratio of 10 l/kg dry matter. The document has been developed to measure the release of inorganic and organic substances from soil and soil-like material as well as to produce eluates for subsequent ecotoxicological testing. For ecotoxicological testing, see ISO 15799 and ISO 17616].

Bodenbeschaffenheit - Elutionsverfahren für die anschließende chemische und ökotoxikologische Untersuchung von Boden und von Bodenmaterialien - Teil 2: Schüttelverfahren mit einem Flüssigkeits/Feststoffverhältnis von 10 l/kg Trockenmasse (ISO 21268-2:2019)

Dieses Dokument legt eine Prüfung fest, die Informationen zur Elution von Boden und Bodenmaterialien unter den im Weiteren festgelegten experimentellen Bedingungen und insbesondere bei einem Flüssig-keits /Feststoffverhältnis von 10 l/kg Trockenmasse liefert.
Dieses Dokument wurde erstellt, um die Freisetzung anorganischer und organischer Substanzen aus Boden und bodenähnlichem Material zu untersuchen und um Eluate für nachfolgende ökotoxikologische Unter-suchungen herzustellen. Hinsichtlich der ökotoxikologischen Prüfung siehe ISO 15799 [6] und ISO 17616 [7].
ANMERKUNG 1   Zu den flüchtigen organischen Substanzen gehören niedermolekulare Substanzen in Mischungen wie z. B. Mineralöl.
ANMERKUNG 2   Es ist nicht immer möglich, die Prüfbedingungen gleichzeitig für anorganische und organische Substanzen zu optimieren, und die optimalen Prüfbedingungen können sich auch für unterschiedliche Gruppen von organischen Substanzen unterscheiden. Die Prüfanforderungen für organische Substanzen sind im Allgemeinen strenger als für anorganische Substanzen. Die Prüfbedingungen, die für die Messung der Freisetzung von organischen Substanzen geeignet sind, sind im Allgemeinen auch auf anorganische Substanzen anwendbar.
ANMERKUNG 3   Innerhalb der Kategorie organischer Substanzen besteht ein deutlicher Verhaltensunterschied zwischen den mehr polaren, relativ wasserlöslichen Verbindungen und den nichtpolaren, hydrophoben organischen Substanzen (en: hydrophobic organic substances, HOCs). Im letzteren Fall können die Freisetzungsmechanismen (z. B. teilchengebundene oder gelöste organische Kohlenstoffverbindungen) sowie die Sorptionsverluste löslicher HOCs bei unterschiedlichen Materialien, mit denen sie in Kontakt kommen (z. B. Flaschen, Filter), von entscheidenderer Bedeutung sein. Die Prüfung und die Ergebnisse sollten nur unter sorgfältiger Berücksichtigung der spezifischen Eigenschaften der zu betrachtenden Substanzen und damit verbundenen möglichen Probleme zur Elution organischer Substanzen angewendet werden.
ANMERKUNG 4   Für ökotoxikologische Untersuchungen sind Eluate erforderlich, die die Freisetzung sowohl von anorganischen als auch von organischen Substanzen widerspiegeln. Im vorliegenden Dokument umfasst die ökotoxiko¬logische Untersuchung auch die genotoxikologische Untersuchung.
Durch das vorliegende Prüfverfahren werden Eluate hergestellt, die anschließend mit physikalischen, chemischen und ökotoxikologischen Verfahren nach bestehenden Standardverfahren charakterisiert werden können. Die Prüfung ist nicht geeignet für Substanzen, die unter Umgebungsbedingungen flüchtig sind.

Qualité du sol - Modes opératoires de lixiviation en vue d'essais chimiques et écotoxicologiques ultérieurs des sols et matériaux du sol - Partie 2: Essai en bâchée avec un rapport liquide/solide de 10 l/kg de matière sèche (ISO 21268-2:2019)

Le présent document spécifie un essai fournissant des informations sur la lixiviation des sols et des matériaux du sol dans les conditions expérimentales spécifiées ci-après, et notamment un rapport liquide/solide égal à 10 l/kg de matière sèche.
Le présent document a été conçu pour étudier le relargage de substances organiques et inorganiques à partir du sol et des matériaux analogues au sol et produire des éluats destinés aux essais écotoxicologiques. Pour en savoir plus sur les essais écotoxicologiques, voir l'ISO 15799[6] et l'ISO 17616[7].
NOTE 1 Les substances organiques volatiles comprennent les substances à faible masse moléculaire contenues dans des mélanges tels que les huiles minérales.
NOTE 2 Il n'est pas toujours possible d'optimiser les conditions d'essai à la fois pour les substances organiques et les substances inorganiques. Les conditions d'essai optimales peuvent également varier entre les différents groupes de substances organiques. Les exigences d'essai pour les substances organiques sont généralement plus strictes que celles applicables aux substances inorganiques. En règle générale, les conditions d'essai appropriées à la mesure du relargage des substances organiques s'appliquent également aux substances inorganiques.
NOTE 3 Au sein de la catégorie des substances organiques, une différence de comportement notable existe entre les composés les plus polaires, relativement solubles dans l'eau et les composés organiques hydrophobes (COH), apolaires. Concernant ces derniers, les mécanismes de relargage (par exemple liés à des particules ou liés au carbone organique dissous) peuvent avoir plus d'importance, de même que les pertes dues à la sorption de COH solubles sur différents matériaux avec lesquels ils entrent en contact (par exemple flacons, filtres). Il convient d'utiliser les essais et les résultats pour la lixiviation des substances organiques, uniquement en ayant une connaissance approfondie des propriétés spécifiques des substances en question et des problèmes potentiels qui y sont associés.
NOTE 4 Pour les essais d'écotoxicité, des éluats avec à la fois des substances inorganiques et organiques sont nécessaires. Dans le présent document, les essais d'écotoxicité englobent les essais de génotoxicité.
Cette méthode d'essai produit des éluats qui peuvent ensuite être caractérisés par des méthodes physiques, chimiques et écotoxicologiques selon des méthodes normalisées existantes. L'essai n'est pas adapté aux substances qui sont volatiles dans des conditions ambiantes.
Ce mode opératoire ne s'applique pas aux matériaux ayant un taux de matière sèche inférieur à 33 %.
Cet essai est principalement destiné à être utilisé à des fins de vérification de routine et de contrôle, et il ne peut pas, à lui seul, être utilisé pour déterminer toutes les propriétés de lixiviation d'un sol. D'autres essais sont nécessaires pour atteindre cet objectif plus large. Le présent document ne traite pas des questions liées à la santé et à la sécurité. Il permet uniquement de déterminer les propriétés de lixiviation telles que décrites dans l'Article 4.

Kakovost tal - Postopki izluževanja za nadaljnje kemijsko in ekotoksikološko preskušanje tal in tlem podobnih materialov - 2. del: Šaržni preskus z razmerjem tekoče/trdno 10 l/kg suhe snovi (ISO 21268-2:2019)

Ta standard določa preskus, ki zagotavlja informacije o izpiranju prsti in prsti podobnih materialov v eksperimentalnih pogojih, določenih v nadaljevanju, zlasti pri razmerju tekoče/trdno za 10 l/kg suhe snovi. Dokument je bil pripravljen za merjenje sproščanja anorganskih in organskih snovi iz prsti in prsti podobnih materialov ter za izdelavo izlužkov za nadaljnje ekotoksikološke preskuse. Za ekotoksikološke preskuse glej ISO 15799 in ISO 17616.

General Information

Status
Published
Public Enquiry End Date
24-Apr-2018
Publication Date
02-Dec-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
04-Nov-2019
Due Date
09-Jan-2020
Completion Date
03-Dec-2019

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SLOVENSKI STANDARD
SIST EN ISO 21268-2:2020
01-januar-2020
Nadomešča:
SIST-TS CEN ISO/TS 21268-2:2010
Kakovost tal - Postopki izluževanja za nadaljnje kemijsko in ekotoksikološko
preskušanje tal in tlem podobnih materialov - 2. del: Šaržni preskus z razmerjem
tekoče/trdno 10 l/kg suhe snovi (ISO 21268-2:2019)

Soil quality - Leaching procedures for subsequent chemical and ecotoxicological testing

of soil and soil-like material - Part 2: Batch test using a liquid to solid ratio of 10 l/kg dry

matter (ISO 21268-2:2019)
Bodenbeschaffenheit - Elutionsverfahren für die anschließende chemische und
ökotoxikologische Untersuchung von Boden und von Bodenmaterialien - Teil 2:

Schüttelverfahren mit einem Flüssigkeits/Feststoffverhältnis von 10 l/kg Trockenmasse

(ISO 21268-2:2019)
Qualité du sol - Modes opératoires de lixiviation en vue d'essais chimiques et

écotoxicologiques ultérieurs des sols et matériaux du sol - Partie 2: Essai en bâchée

avec un rapport liquide/solide de 10 l/kg de matière sèche (ISO 21268-2:2019)
Ta slovenski standard je istoveten z: EN ISO 21268-2:2019
ICS:
13.080.05 Preiskava tal na splošno Examination of soils in
general
SIST EN ISO 21268-2:2020 en,fr,de

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

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SIST EN ISO 21268-2:2020
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SIST EN ISO 21268-2:2020
EN ISO 21268-2
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 13.080.05 Supersedes CEN ISO/TS 21268-2:2009
English Version
Soil quality - Leaching procedures for subsequent chemical
and ecotoxicological testing of soil and soil-like material -
Part 2: Batch test using a liquid to solid ratio of 10 l/kg dry
matter (ISO 21268-2:2019)

Qualité du sol - Modes opératoires de lixiviation en vue Bodenbeschaffenheit - Elutionsverfahren für die

d'essais chimiques et écotoxicologiques ultérieurs des anschließende chemische und ökotoxikologische

sols et matériaux du sol - Partie 2: Essai en bâchée avec Untersuchung von Boden und von Bodenmaterialien -

un rapport liquide/solide de 10 l/kg de matière sèche Teil 2: Schüttelverfahren mit einem

(ISO 21268-2:2019) Flüssigkeits/Feststoffverhältnis von 10 l/kg
Trockenmasse (ISO 21268-2:2019)
This European Standard was approved by CEN on 1 September 2019.

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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21268-2:2019 E

worldwide for CEN national Members.
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SIST EN ISO 21268-2:2020
EN ISO 21268-2:2019 (E)
Contents Page

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

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SIST EN ISO 21268-2:2020
EN ISO 21268-2:2019 (E)
European foreword

This document (EN ISO 21268-2:2019) has been prepared by Technical Committee ISO/TC 190 "Soil

quality" in collaboration with Technical Committee CEN/TC 444 “Test methods for environmental

characterization of solid matrices” the secretariat of which is held by NEN.

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 2020, and conflicting national standards shall be

withdrawn at the latest by April 2020.

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

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

This document supersedes CEN ISO/TS 21268-2:2009.

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 21268-2:2019 has been approved by CEN as EN ISO 21268-2:2019 without any

modification.
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SIST EN ISO 21268-2:2020
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SIST EN ISO 21268-2:2020
INTERNATIONAL ISO
STANDARD 21268-2
First edition
2019-09
Soil quality — Leaching procedures
for subsequent chemical and
ecotoxicological testing of soil and
soil-like materials —
Part 2:
Batch test using a liquid to solid ratio
of 10 l/kg dry matter
Qualité du sol — Modes opératoires de lixiviation en vue d'essais
chimiques et écotoxicologiques ultérieurs des sols et matériaux du
sol —
Partie 2: Essai en bâchée avec un rapport liquide/solide de 10 l/kg de
matière sèche
Reference number
ISO 21268-2:2019(E)
ISO 2019
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SIST EN ISO 21268-2:2020
ISO 21268-2:2019(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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
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 21268-2:2020
ISO 21268-2:2019(E)
Contents Page

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

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Principle ........................................................................................................................................................................................................................ 3

5 Reagents ........................................................................................................................................................................................................................ 3

6 Apparatus ..................................................................................................................................................................................................................... 4

7 Sample pretreatment ....................................................................................................................................................................................... 5

7.1 Preparation of laboratory sample and specification of particle size ........................................................ 5

7.2 Preparation of test sample ............................................................................................................................................................ 6

7.3 Determination of dry matter content and water content .................................................................................. 6

7.4 Preparation of the test portion ................................................................................................................................................. 7

8 Procedure..................................................................................................................................................................................................................... 7

8.1 Temperature .............................................................................................................................................................................................. 7

8.2 Description of the procedure ...................................................................................................................................................... 7

8.2.1 Preparation of the eluent .......................................................................................................................................... 7

8.2.2 Leaching step ...................................................................................................................................................................... 7

8.2.3 Liquid/Solid separation step ................................................................................................................................. 8

8.3 Further preparation of the eluate for analysis............................................................................................................. 9

8.4 Blank test for the application of the leaching procedure ................................................................................... 9

9 Calculation ...............................................................................................................................................................................................................10

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

11 Analytical determination ..........................................................................................................................................................................11

11.1 General ........................................................................................................................................................................................................11

11.2 Blank test information ...................................................................................................................................................................11

12 Performance characteristics .................................................................................................................................................................11

12.1 General ........................................................................................................................................................................................................11

12.2 Validation results obtained for DIN 19529 ..................................................................................................................11

12.2.1 General...................................................................................................................................................................................11

12.2.2 Results for test material containing inorganic substances .......................................................12

12.2.3 Results for test materials containing organic substances .........................................................12

Annex A (informative) Information on the influence on the test results of the parameters

that affect leaching ..........................................................................................................................................................................................20

Annex B (informative) Example of a specific liquid-solid separation procedure for soil

samples (applying only to the leaching of inorganic substances) ..................................................................23

Annex C (informative) Calculation of centrifugation duration depending on centrifugation

speed and rotor dimensions..................................................................................................................................................................25

Bibliography .............................................................................................................................................................................................................................27

© ISO 2019 – All rights reserved iii
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SIST EN ISO 21268-2:2020
ISO 21268-2:2019(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 of 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 www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 190, Soil quality, Subcommittee SC 7,

Impact assessment.

This first edition of ISO 21268-2:2019 cancels and replaces the first edition (ISO/TS 21268-2:2007),

which has been technically revised. The main changes compared to the previous edition are as follows:

— the maximum grain size has been changed to <2 mm as usual for soil;
— the demineralized water has been added as possible leachant;

— 7.1 and 7.2 have been renumbered and renamed to read 7.1 "Particle size" and 7.2 "Sample

preparation";

— 12.1 "General" and 12.2 "Validation results obtained for DIN 19529" have been added;

— A.3.6 "Special requirements for tests considering semi-volatile substances" has been added;

— a new informative Annex C "Calculation of centrifugation duration depending on centrifugation

speed and rotor dimensions" has been added;
— references in Clause 2 and the Bibliography have been updated.
A list of all parts in the ISO 21268 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 www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
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SIST EN ISO 21268-2:2020
ISO 21268-2:2019(E)
Introduction

In various countries, tests have been developed to characterize and assess the substances which can

be released from materials. The release of soluble substances upon contact with water is regarded as

a main mechanism of release, which results in a potential risk to the environment during the use or

disposal of materials. The intent of these tests is to identify the leaching properties of materials. The

[1]
complexity of the leaching process makes simplifications necessary .

Not all of the relevant aspects of leaching behaviour can be addressed in one standard (see description

of influencing factors in Annex A).

Tests to characterize the behaviour of materials can generally be divided into three categories addressed

[2] [3]

in ISO 18772 and EN 12920 . The relationships between these tests are summarized below.

a) “Basic characterization” tests are used to obtain information on the short- and long-term

leaching behaviour and characteristic properties of materials. Liquid/solid ratios (L/S), leachant

composition, factors controlling leachability, such as pH, redox potential, complexing capacity, role

of dissolved organic carbon (DOC), ageing of material and physical parameters, are addressed in

these defined tests.

b) “Compliance” tests are used to determine whether the material complies with a specific behaviour

or with specific reference values. These tests focus on key variables and leaching behaviour

previously identified by basic characterization tests.

c) “On-site verification” tests are used as a rapid check to confirm that the material is the same as that

which has been subjected to the compliance test(s). On-site verification tests are not necessarily

leaching tests.

The test procedure described in this method belongs to category b): compliance tests.

[4]

This document was originally elaborated on the basis of EN 12457-2:2004 . Especially, modifications

considering requirements on subsequent ecotoxicological testing and analysis of organic substances

[5]
have been included. Validation results have been adopted from DIN 19529 .
© ISO 2019 – All rights reserved v
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SIST EN ISO 21268-2:2020
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SIST EN ISO 21268-2:2020
INTERNATIONAL STANDARD ISO 21268-2:2019(E)
Soil quality — Leaching procedures for subsequent
chemical and ecotoxicological testing of soil and soil-like
materials —
Part 2:
Batch test using a liquid to solid ratio of 10 l/kg dry matter
1 Scope

This document specifies a test providing information on leaching of soil and soil materials under the

experimental conditions specified hereafter, and particularly at a liquid to solid ratio of 10 l/kg dry matter.

The document has been developed to measure the release of inorganic and organic substances from

soil and soil-like material as well as to produce eluates for subsequent ecotoxicological testing. For

[6] [7]
ecotoxicological testing, see ISO 15799 and ISO 17616 .

NOTE 1 Volatile organic substances include the low-molecular-weight substances in mixtures such as

mineral oil.

NOTE 2 It is not always possible to optimize test conditions simultaneously for inorganic and organic

substances and optimum test conditions can also vary between different groups of organic substances. Test

requirements for organic substances are generally more stringent than those for inorganic substances. The test

conditions suitable for measuring the release of organic substances will generally also be applicable to inorganic

substances.

NOTE 3 Within the category of organic substances, a significant difference in behaviour exists between the

more polar, relatively water-soluble compounds and apolar, hydrophobic organic substances (HOCs). In the latter

case, mechanisms of release (e.g. particle-bound or dissolved organic carbon-bound) can be more crucial as well

as sorption losses of soluble HOCs on different materials with which they come in contact (e.g. bottles, filters).

The test and the results should be used for leaching of organic substances only with thorough consideration of

the specific properties of the substances in question and the associated potential problems.

NOTE 4 For ecotoxicological testing, eluates representing the release of both inorganic and organic substances

are needed. In this document, ecotoxicological testing is also meant to include genotoxicological testing.

This test method produces eluates, which can subsequently be characterized by physical, chemical and

ecotoxicological methods in accordance with existing standard methods. The test is not suitable for

substances that are volatile under ambient conditions.

This procedure is not applicable to materials with a dry-matter-content ratio lower than 33 %.

This test is mainly aimed at being used for routine and control purposes, and it cannot be used alone

to describe all leaching properties of a soil. Additional leaching tests are needed for that extended goal.

This document does not address issues related to health and safety. It only determines the leaching

properties as outlined in Clause 4.
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 3696, Water for analytical laboratory use — Specification and test methods
© ISO 2019 – All rights reserved 1
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SIST EN ISO 21268-2:2020
ISO 21268-2:2019(E)

ISO 5667-3, Water quality — Sampling — Part 3: Preservation and handling of water samples

ISO 7027-1, Water quality — Determination of turbidity — Part 1: Quantitative methods

ISO 10523, Water quality — Determination of pH

ISO 11465, Soil quality — Determination of dry matter and water content on a mass basis —

Gravimetric method
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
leaching test

test during which a material is put into contact with a leachant (3.2) under strictly defined conditions

and some substances of the material are extracted
3.2
leachant
liquid used in a leaching test (3.1)

Note 1 to entry: For the purpose of this document, the leachant is specified in 5.1.

3.3
eluate
solution recovered from a leaching test (3.1)
Note 1 to entry: Eluate is also referred to as leachate.
3.4
liquid to solid ratio
L/S

ratio between the total volume of liquid (L in litres), which in this extraction is in contact with the soil

sample, and the dry mass of the sample (S in kg of dry matter)
Note 1 to entry: L/S is expressed in l/kg.
3.5
dry matter content

ratio, expressed in percent, between the mass of the dry residue, determined in accordance with

ISO 11465, and the corresponding raw mass
3.6
water content

ratio, expressed in percent, between the mass of water contained in the material as received and the

corresponding dry residue of the material

Note 1 to entry: The basis for the calculation of the water content is the mass of the dry residue in this document,

as specified in ISO 11465 (for the determination of the water content of soil).
2 © ISO 2019 – All rights reserved
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SIST EN ISO 21268-2:2020
ISO 21268-2:2019(E)
3.7
laboratory sample
sample or sub-sample(s) sent to or received by the laboratory
3.8
test sample

sample, prepared from the laboratory sample (3.7), from which test portions (3.9) are removed for

testing or analysis
3.9
test portion

quantity of material of appropriate size for measurement of the concentration or other properties of

interest taken from the test sample (3.8)

Note 1 to entry: The test portion can be taken from the laboratory sample (3.7) directly if no pre-treatment of the

sample is required, but usually it is taken from the test sample.

Note 2 to entry: A unit or increment of proper homogeneity, size and fineness, needing no further preparation,

can be a test portion.
3.10
soil-like material
[7]

excavated soil, dredged materials, manufactured soils, treated soils and fill materials

4 Principle

The test portion, which originally or after suitable pre-treatment has a particle size less than or equal

to 2 mm, is brought into contact with water containing a low concentration (0,001 mol/l) of calcium

chloride or demineralized water (5.1) under defined conditions. The standard method is based on the

assumption that equilibrium or near-equilibrium is achieved between the liquid and solid phases during

the test period. The solid residue is subsequently separated from the liquid. The separation procedure

may strongly influence the test results and shall be particularly stringent for organic substances. The

properties of the eluate are measured using methods developed for water analysis adapted to meet

criteria for analysis of eluates, and the eluate may be subjected to subsequent ecotoxicological testing.

After the test, the leaching conditions imposed by the material, in terms of pH, electrical conductivity

and, optionally, DOC, redox potential or turbidity, shall be recorded.

NOTE 1 These parameters often control the leaching behaviour of soil and soil-like materials and are therefore

important for evaluation of the test results. DOC, in particular, is crucial in soil and soil materialsoil-like materials

for many inorganic and organic substances.

NOTE 2 The leachant is 0,001 mol/l CaCl to minimize the mobilization of DOC caused by an ionic strength of

the leachant which is too low.

The procedure described in this document is based on the more stringent test requirements for

determining the release of organic substances and for subsequent ecotoxicological testing. If only the

release of inorganic substances is to be measured, less stringent requirements may be adopted for some

steps of the procedure.
5 Reagents

5.1 Demineralized water or deionized water or water of equivalent purity (5 < pH < 7,5) with a

conductivity of <0,5 mS/m in accordance with grade 3 specified in ISO 3696 made to 0,001 mol/l CaCl .

5.2 Calcium chloride (CaCl · 2 H O), analytical grade.
2 2
5.3 Sodium azide (NaN ), analytical grade.
© ISO 2019 – All rights reserved 3
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SIST EN ISO 21268-2:2020
ISO 21268-2:2019(E)
5.4 Nitric acid (HNO ), analytical grade, made to 0,1 mol/l rinsing solution.
5.5 Organic solvent (acetone, analytical grade) for rinsing and cleaning.
6 Apparatus

6.1 Borosilicate glass, of high purity in accordance with ISO 5667-3, with a nominal volume of 1 l,

glass bottles having caps of inert material, for example PTFE (polytetrafluoroethylene). Rinsing is

compulsory and it should be assured that previously used bottles have no background level of analytes.

NOTE 1 If only inorganic parameters are analysed, alternative materials, such as HDPE/PP bottles, are

appropriate, except for unpreserved samples for mercury analysis.

NOTE 2 To prevent organic compounds from degradation by light use a dark room, dark colored glassware or

place a layer of aluminium-foil around the leaching equipment.

If boron analyses are necessary, any plastics bottles can be used, e.g. PTFE (polytetrafluoroethylene).

The volume of 1 l is selected in combination with the mass, m , of 100 g as specified in 7.4 in order to

minimize head-space in the bottle at an L/S of 10 l/kg dry matter. In the case of materials with low

density, deviation from this requirement can be necessary while still ensuring minimum headspace.

This deviation shall be reported.
NOTE 3 Glass of high quality is co
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