oSIST prEN 13654-2:2025

SLOVENSKI STANDARD
01-december-2025
Nadomešča:
SIST EN 13654-2:2002
Izboljševalci tal in rastni substrati - Določanje dušika - 2. del: Dumasova metoda
Soil improvers and growing media - Determination of nitrogen - Part 2: Dumas method
Bodenverbesserungsmittel und Kultursubstrate - Bestimmung von Stickstoff - Teil 2:
Verfahren nach Dumas
Amendements du sol et supports de culture - Détermination de l'azote - Partie 2:
Méthode de Dumas
Ta slovenski standard je istoveten z: prEN 13654-2
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2025
ICS 65.080 Will supersede EN 13654-2:2001
English Version
Soil improvers and growing media - Determination of
nitrogen - Part 2: Dumas method
Amendements du sol et supports de culture - Bodenverbesserungsmittel und Kultursubstrate -
Détermination de l'azote - Partie 2: Méthode de Dumas Bestimmung von Stickstoff - Teil 2: Verfahren nach
Dumas
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 223.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

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. prEN 13654-2:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Reagents . 4
6 Apparatus . 4
7 Sampling . 5
8 Test sample . 5
9 Procedure . 5
9.1 Safety . 5
9.2 Calibration of the apparatus . 5
9.3 Determination of the nitrogen content . 5
9.4 Residual moisture . 5
10 Calculation . 5
11 Expression of results . 6
12 Test Report . 6
13 Validation of the method . 6
13.1 Validation in accordance with ISO 5725-2. 6
13.2 Performance characteristics. 7
Annex A (informative) Performance characteristics of the method . 8
Bibliography . 10

European foreword
This document (prEN 13654-2:2025) has been prepared by Technical Committee CEN/TC 223 “Soil
improvers and growing media”, the secretariat of which is held by NEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13654-2:2001.
EN 13654-2:2001:
— Adaptation of scope and applicability with respect to the EU – Fertilizer Product Regulation [5].
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
1 Scope
This document specifies a method for the determination of nitrogen in soil improvers and growing media.
The dry combustion method was developed originally as a manual method by Dumas [4]. Its application
is improved greatly due to the use of modern automated equipment and is applicable to all forms of
nitrogen.
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.
CEN/TS 17732:2022, Soil improvers and growing media - Terminology
EN 12579:2024, Soil improvers and growing media - Sampling
prEN 13040-1:2025, Soil improvers and growing media — Sample preparation — Part 1: Sample
preparation for chemical and physical tests, determination of dry matter content, moisture content and
laboratory bulk density
3 Terms and definitions
For the purposes of this document, the terms and definitions given in CEN/TS 17732:2022 apply.
4 Principle
The nitrogen content of the sample is determined by heating to a temperature of at least 900 °C in the
presence of oxygen gas. Mineral and organic nitrogen compounds are oxidized and/or volatilized and
determined as described by the manufacturer.
5 Reagents
Use only reagents of recognized analytical grade.
5.1 For reduction, oxidation, removal and/or fixing of combustion gases that interfere with the
analysis, refer to the manufacturer’s instructions.
5.2 Calibration substances, pure substances of known nitrogen content, for example acetani
...