SIST EN ISO 11465:2026

SLOVENSKI STANDARD
01-marec-2026
Nadomešča:
SIST EN 12880:2001
SIST EN 15934:2012
SIST ISO 11465:1996
SIST ISO 11465:1996/Cor 1:2005
Blato in trdni matriksi v okolju - Določanje suhega ostanka ali vsebnosti vode in
izračun suhe snovi na podlagi mase (ISO 11465:2025)
Sludge and solid environmental matrices - Determination of dry residue or water content
and calculation of the dry matter fraction on a mass basis (ISO 11465:2025)
Schlamm und feste Umweltmatrizes - Bestimmung des Trockenrückstands oder des
Wassergehalts und Berechnung des Trockenmassenanteils auf Grundlage der Masse
(ISO 11465:2025)
Boues et matrices environnementales solides - Détermination de la teneur en résidu sec
ou en eau et calcul de la fraction massique de matière sèche (ISO 11465:2025)
Ta slovenski standard je istoveten z: EN ISO 11465:2025
ICS:
13.030.20 Tekoči odpadki. Blato Liquid wastes. Sludge
13.080.20 Fizikalne lastnosti tal Physical properties of soils
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11465
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2025
EUROPÄISCHE NORM
ICS 13.080.20 Supersedes EN 12880:2000, EN 15934:2012
English Version
Sludge and solid environmental matrices - Determination
of dry residue or water content and calculation of the dry
matter fraction on a mass basis (ISO 11465:2025)
Boues et matrices environnementales solides - Schlamm und feste Umweltmatrizes - Bestimmung des
Détermination de la teneur en résidu sec ou en eau et Trockenrückstands oder des Wassergehalts und
calcul de la fraction massique de matière sèche (ISO Berechnung des Trockenmassenanteils auf Grundlage
11465:2025) der Masse (ISO 11465:2025)
This European Standard was approved by CEN on 29 August 2025.

This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 17 December 2025.

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, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N

EUROPÄISCHES KOMITEE FÜR NORMUN G

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11465:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11465:2025) has been prepared by Technical Committee ISO/TC 190 "Soil
quality " in collaboration with Technical Committee CEN/TC 444 “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 March 2026, and conflicting national standards shall
be withdrawn at the latest by March 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12880:2000, EN 15934:2012.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 11465:2025 has been approved by CEN as EN ISO 11465:2025 without any modification.

International
Standard
ISO 11465
Second edition
Sludge and solid environmental
2025-08
matrices — Determination of
dry residue or water content
and calculation of the dry matter
fraction on a mass basis
Boues et matrices environnementales solides — Détermination de
la teneur en résidu sec ou en eau et calcul de la fraction massique
de matière sèche
Reference number
ISO 11465:2025(en) © ISO 2025
ISO 11465:2025(en)
© ISO 2025
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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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 11465:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
4.1 General .2
4.2 Principle of method A — Drying at 105 °C (dry residue) .2
4.3 Principle of method B — Direct Karl Fischer titration (water content) .2
5 Sample preparation . 2
6 Method A — Drying at 105 °C . 2
6.1 General .2
6.2 Interferences .2
6.3 Hazards .2
6.4 Apparatus .3
6.5 Procedure .3
7 Method A — Expression of results . 4
7.1 Calculation of dry residue . .4
7.2 Calculation of water content .4
7.2.1 General .4
7.2.2 Calculation of water content on a field moist basis .4
7.2.3 Calculation of water content on a dry residue basis .5
8 Method B — Direct Karl Fischer titration (volumetric/coulometric detection) . 5
8.1 Interferences .5
8.2 Reagents .5
8.3 Apparatus .5
8.4 Procedure .6
8.4.1 Determination of the equivalence factor .6
8.4.2 Analysis of liquid samples .6
8.4.3 Expression of results .6
8.4.4 Analysis of solid samples .6
8.4.5 Expression of results .7
8.4.6 Calculation of dry matter fraction .7
9 Precision . 7
10 Test report . 7
Annex A (informative) Repeatability and reproducibility . 8
Bibliography .12

iii
ISO 11465:2025(en)
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 3, Chemical
and physical characterization, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 444, Environmental characterization of solid matrices, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 11465:1993), which has been technically
revised. It also incorporates the Technical Corrigendum ISO 11465:1993/Cor 1:1994.
The main changes are as follows:
— content was merged with the content of EN 12880 where appropriate;
— content was merged with the content of EN 15934 where appropriate.
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 11465:2025(en)
Introduction
In case of analysis of solids and sludge, water is usually not considered as part of the sample and results are
generally related to dry matter, which can be calculated by determination of the dry residue (dry matter
fraction). For this purpose, and for the determination of the water content, two methods are specified in this
document. The choice of the method depends on the type of sample and its content of volatile substances
excluding water.
As a result of the validation study, the determination of water content by azeotropic distillation has been
replaced by Karl Fischer titration. Nevertheless, the distillation can be useful in certain cases.
This document is applicable and validated for several types of matrices as indicated in Table 1 (see also
Annex A for the results of the validation).
Table 1 — Matrices for which this document is applicable and validated
Matrix Materials used for validation
Sludge (only method A) Municipal sludge
Biowaste (only method A) Fresh compost
Soil (only method A) Sludge amended soil
Contaminated soil
Dredged sludge
Nickel sludge
Waste (methods A and B)
Filter cake
Distillation residue
Drilling emulsion
v
International Standard ISO 11465:2025(en)
Sludge and solid environmental matrices — Determination of
dry residue or water content and calculation of the dry matter
fraction on a mass basis
WARNING — Persons using this document should be familiar with usual laboratory practice. This
document does not purport to address all of the safety problems, if any, associated with its use. It
is the responsibility of the user to establish appropriate safety and health practices and to ensure
compliance with any national regulatory conditions.
IMPORTANT — It is essential that tests conducted according to this document be carried out by
suitably trained staff.
1 Scope
This document specifies methods for the calculation of the dry matter fraction of sludge, sludge products,
treated biowaste, soil and waste for which the results of performed analysis are calculated to the dry matter
basis. Depending on the nature and origin of the sample, the calculation is based on a determination of the
dry residue (method A) or a determination of the water content (methods A and B). It applies to samples
containing more than 1 % (mass fraction) of dry residue or more than 1 % (mass fraction) of water.
Method A applies to sludge, sludge products, treated biowaste, soil and solid waste. Method B applies to
liquid waste and to samples which are suspected or known to contain volatiles except for water.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
dry residue
remaining mass fraction of a sample after a drying process at 105 °C under specified conditions
3.2
water content
mass fraction of water in a sample determined by the method after drying at 105 °C or by Karl Fischer
titration under specified conditions
3.3
dry matter fraction
mass fraction of a sample minus its water content

ISO 11465:2025(en)
4 Principle
4.1 General
Depending on the origin (sludge, biowaste, soil, waste) and the nature of the sample (liquid, solid or
multiphase) either the water content or the dry residue is determined. The results from the determination
of water content or dry residue are used to calculate the dry matter fraction. In case of multiphase (waste)
samples, these samples shall be homogenized. If homogenization is not possible, a phase separation according
to e.g. EN 15002 can be applicable and the phases are analysed separately.
4.2 Principle of method A — Drying at 105 °C (dry residue)
The sample is dried to a constant mass at 105 °C. This method applies to solid samples and samples which
become solid during the drying process. The method generally applies to soil
...