prEN ISO 15936
(Main)Soil, waste, treated biowaste and sludge - Determination of total organic carbon (TOC) by dry combustion (ISO/DIS 15936:2025)
Soil, waste, treated biowaste and sludge - Determination of total organic carbon (TOC) by dry combustion (ISO/DIS 15936:2025)
Specifies a method for the determination of the total carbon content in soil after dry combustion. The organic carbon content is calculated from this content after correcting for carbonates present in the sample. If carbonates are removed beforehand, the organic carbon content is measured directly. Applicable to all types of air-dried soil samples.
Boden, Abfall, behandelter Bioabfall und Schlamm - Bestimmung des gesamten organischen Kohlenstoffs (TOC) mittels trockener Verbrennung (ISO/DIS 15936:2025)
Sols, déchets, biodéchets traités et boues - Dosage du carbone organique total (COT) par combustion sèche (ISO/DIS 15936:2025)
La présente Norme internationale prescrit une méthode de dosage du carbone organique et du carbone total du sol après combustion sèche. La teneur en carbone organique est déterminée à partir de cette dernière valeur après correction en raison des carbonates présents dans l'échantillon. Si ces derniers sont éliminés au préalable, on effectue le dosage du carbone organique directement. La présente Norme internationale est applicable à tous les types d'échantillons de sol séchés à l'air.
Tla, odpadki, obdelani biološki odpadki in blato - Določanje celotnega organskega ogljika (TOC) s suhim sežigom (ISO/DIS 15936:2025)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2025
Tla, odpadki, obdelani biološki odpadki in blato - Določanje celotnega organskega
ogljika (TOC) s suhim sežigom (ISO/DIS 15936:2025)
Soil, waste, treated biowaste and sludge - Determination of total organic carbon (TOC)
by dry combustion (ISO/DIS 15936:2025)
Boden, Abfall, behandelter Bioabfall und Schlamm - Bestimmung des gesamten
organischen Kohlenstoffs (TOC) mittels trockener Verbrennung (ISO/DIS 15936:2025)
Sols, déchets, biodéchets traités et boues - Dosage du carbone organique total (COT)
par combustion sèche (ISO/DIS 15936:2025)
Ta slovenski standard je istoveten z: prEN ISO 15936
ICS:
13.030.20 Tekoči odpadki. Blato Liquid wastes. Sludge
13.080.10 Kemijske značilnosti tal Chemical characteristics of
soils
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 15936
ISO/TC 190/SC 3
Soil, waste, treated biowaste and
Secretariat: DIN
sludge — Determination of total
Voting begins on:
organic carbon (TOC) by dry
2025-10-02
combustion
Voting terminates on:
ICS: 13.080.10
2025-12-25
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
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This document has not been edited by the ISO Central Secretariat.
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Reference number
ISO/DIS 15936:2025(en)
DRAFT
ISO/DIS 15936:2025(en)
International
Standard
ISO/DIS 15936
ISO/TC 190/SC 3
Soil, waste, treated biowaste and
Secretariat: DIN
sludge — Determination of total
Voting begins on:
organic carbon (TOC) by dry
combustion
Voting terminates on:
ICS: 13.080.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
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BE CONSIDERED IN THE LIGHT OF THEIR
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Published in Switzerland Reference number
ISO/DIS 15936:2025(en)
ii
ISO/DIS 15936:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
4.1 Method A (indirect procedure) .2
4.2 Method B (direct procedure) .2
5 Interferences . 2
6 Reagents . 3
7 Apparatus . 4
8 Sample pre-treatment . 4
9 Procedure – Method A (indirect method) . 4
9.1 Determination .4
9.1.1 General .4
9.1.2 Determination of the TC .4
9.1.3 Determination of the TIC .5
9.2 Calibration .5
9.3 Control measurements .5
9.4 Calculation and expression of results .6
10 Procedure Method B (direct method) . 7
10.1 Determination .7
10.1.1 General .7
10.1.2 Removal of the inorganic carbon and determination of the TOC . .7
10.2 Calibration .7
10.3 Control measurements .7
10.4 Calculation and expression of results .8
11 Performance data . 8
12 Expression of results . 8
13 Test report . 9
Annex A (informative) Repeatability and reproducibility data .10
Annex B (informative) Factors influencing dry combustion methods .13
Bibliography .16
iii
ISO/DIS 15936:2025(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
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This document was prepared by Technical Committee ISO/TC 190, Soil quality, Subcommittee SC 3, Chemical
and physical characterization.
This edition cancels and replaces ISO 10694:1995, which has been technically revised.
The main changes are as follows:
— the content of EN 15936:2022 and ISO 10694:1995 has been merged;
— the scope has been widened to include treated biowaste, waste and sludge;
— clause 9.2 "Calibration" and 9.3 "Control measurements" have been technical revised;
— the text has been editorially revised.
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
DRAFT International Standard ISO/DIS 15936:2025(en)
Soil, waste, treated biowaste and sludge — Determination of
total organic carbon (TOC) by dry combustion
1 Scope
This document specifies two methods for the determination of total organic carbon (TOC) in sludge, treated
biowaste, soil and waste samples containing more than 0,1 % carbon in relation to the dry matter (dm).
This document is validated for several types of matrices as indicated in Table 1 (see also Annex A for the
results of the validation). The results in this document are expressed in % C in relation to the dry matter (dm).
Table 1 — Matrices for which this document is applicable and validated for
Matrix Materials used for validation
Sludge Municipal sludge
Biowaste Compost, Fresh Compost
Soil Sludge amended soil, Agricultural soil
Waste Filter cake, Bottom ash,
Electro-plating sludge, Dredged sludge,
Rubble
NOTE This method can also be applied to other environmental solid matrices, provided the user has verified the
applicability.
WARNING — P
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