kSIST FprEN 17752:2026

• Abstract:

  This document specifies references to the methods for the determination of nitrification inhibitoring compounds and urease inhibiting compounds in inorganic fertilizers.; This document is not applicable to fertilizing products blends.

• Status: Not Published
• Public Enquiry End Date: 01-Apr-2026
• ICS: 65.080 - Fertilizers
• Technical Committee: KAT - Soil quality
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 09-Oct-2026
• Due Date: 27-Nov-2026
• Directive: 2019/1009 - Regulation (EU) 2019/1009 of the European Parliament and of the Council of 5 June 2019 laying down rules on the making available on the market of EU fertilising products and amending Regulations (EC) No 1069/2009 and (EC) No 1107/2009 and repealing Regulation (EC) No 2003/2003 (Text with EEA relevance)
• Mandate: M/564 - Fertilising products in support of Regulation (EU) 2019/1009
• Mandate: M/564 AMD 1 - amending Implementing Decision C(2020) 612 as regards certain harmonised standards and standardisation deliverables, deadlines for their adoption and the duration of the validity of the standardisation request
• Mandate: M/564 AMD 2 - Commission Implementing decision amending Implementing Decision C(2020)612 as regards harmonised standards, the deadlines for the adoption of those standards and the duration of the validity of the standardisation request to the European Committee for Standardisation as regards the EU fertilising products in support of Regulation (EU) 2019/1009 of the European Parliament and of the Council
• Ref Project: FprEN 17752 - Inorganic fertilizers - Determination of specific inhibiting compounds

• Revises: SIST-TS CEN/TS 17752:2023 - Inorganic fertilizers - Determination of specific inhibitors
• Effective Date: 01-Mar-2026

kSIST FprEN 17752:2026 is the Slovenian version of draft European Standard prEN 17752 from CEN. It applies to inorganic fertilizers and points to the methods used to determine specific nitrification-inhibiting and urease-inhibiting compounds. In practice, it tells laboratories and fertilizer producers which referenced EN method to use when checking these compounds in products within scope.

What does kSIST FprEN 17752:2026 specify?

kSIST FprEN 17752:2026 specifies references to methods for determining nitrification inhibiting compounds and urease inhibiting compounds in inorganic fertilizers. It is a method-selection standard rather than a full analytical procedure, so the user follows the external EN methods named in Clause 5.

The scope excludes fertilizing product blends. The document is organized into Scope, Normative references, Terms and definitions, Sampling and sample preparation, Determination of specific inhibiting compounds, Annex ZA, and a Bibliography.

Annex	What it covers
Annex ZA	Relationship between this European Standard and the essential requirements of Regulation (EU) 2019/1009 for EU fertilising products. It maps the relevant clauses to the regulation and explains the conformity link.

What are the key requirements of kSIST FprEN 17752:2026?

kSIST FprEN 17752:2026 works by linking each target compound to a specific EN test method. That matters because users do not need to interpret a general chemistry procedure here - they need to select the right method for the compound and product type.

Sampling and sample preparation

Clause 4 says sampling is not part of the method in this document. A representative laboratory sample is still critical, and it should not be damaged or altered during transport or storage. Sample preparation shall follow EN 1482-2:2024, which keeps the laboratory step consistent before analysis.

In practice, this means the analytical result depends on getting the right sample into the lab first. Poor sampling can make even a correct test method give a misleading result.

Nitrification inhibiting compounds

Clause 5.1 assigns separate EN methods for the nitrification inhibiting compounds:

• dicyandiamide - EN 15360:2007
• 3-methylpyrazole (MP) - EN 15905:2010
• 1H-1,2,4-triazole in urea and fertilizers containing urea - EN 16024:2011
• 3,4-dimethyl-1H-pyrazole phosphate (DMPP) - EN 16328:2012
• 2-(3,4-dimethyl-pyrazol-1-yl)-succinic acid (DMPSA) - EN 17090:2018

For DMPP and DMPSA, the document notes that the referenced methods report mg/kg, while Regulation (EU) 2019/1009 expects mass fraction in %. Users therefore need the stated conversion when results are used for regulatory purposes.

Urease inhibiting compounds

Clause 5.2 assigns the urease inhibitor methods:

• N-(n-butyl)thiophosphoric triamide (NBPT) - EN 15688:2008
• N-(2-nitrophenyl)phosphoric triamide (2-NPT) in urea and fertilizers containing urea - EN 16075:2011
• NBPT and N-(n-propyl)thiophosphoric triamide (NPPT) - EN 16651:2015

This is useful for product release, conformity assessment, and market surveillance because the document clearly separates the single-compound and combined-compound cases.

EU conformity link

Annex ZA ties Clauses 4, 5.1 and 5.2 to Regulation (EU) 2019/1009 for EU fertilising products. In practice, when the standard is cited in the Official Journal of the European Union, compliance with the relevant clauses supports presumption of conformity within the document’s scope.

What terms does kSIST FprEN 17752:2026 define?

kSIST FprEN 17752:2026 uses the vocabulary of EN 12944-1:1999 and EN 12944-2:1999 for its terms and definitions. The analytes below are the key named compounds in the document.

• Dicyandiamide - a nitrification inhibitor compound whose content is determined by EN 15360.
• 3-methylpyrazole (MP) - a nitrification inhibitor compound measured by EN 15905.
• 3,4-dimethyl-1H-pyrazole phosphate (DMPP) - a nitrification inhibitor compound measured by EN 16328.
• 2-(3,4-dimethyl-pyrazol-1-yl)-succinic acid (DMPSA) - a nitrification inhibitor compound measured by EN 17090.
• N-(n-butyl)thiophosphoric triamide (NBPT) - a urease inhibitor measured by EN 15688 and also paired with NPPT in EN 16651.
• N-(n-propyl)thiophosphoric triamide (NPPT) - a urease inhibitor measured together with NBPT by EN 16651.
• N-(2-nitrophenyl)phosphoric triamide (2-NPT) - a urease inhibitor measured by EN 16075 in urea and fertilizers containing urea.

Who uses kSIST FprEN 17752:2026?

kSIST FprEN 17752:2026 is used by fertilizer laboratories, quality control teams, manufacturers, importers, and conformity assessment bodies working with inorganic fertilizers. It is also relevant to regulatory and market-surveillance tasks where results need to be linked to Regulation (EU) 2019/1009.

In practice, these users apply it to choose the right analytical method, prepare samples correctly, and document inhibitor content for product specifications, release testing, and compliance checks.

What changed in kSIST FprEN 17752:2026 from the previous edition?

kSIST FprEN 17752:2026 supersedes CEN/TS 17752:2022. Compared with that previous edition, the document:

• adopts the CEN Technical Specification as a European Standard and adds Annex ZA
• updates Clause 1 to reflect fertilizing product blends
• updates the normative references and the bibliography

Which standards are used with kSIST FprEN 17752:2026?

Standard	Contribution
EN 1482-2:2024	Sample preparation before analysis
EN 12944-1:1999	General fertilizer and liming material vocabulary used in Clause 3
EN 12944-2:1999	Fertilizer-specific vocabulary used in Clause 3
EN 15360:2007	Dicyandiamide determination by HPLC
EN 15688:2008	NBPT determination by HPLC
EN 15905:2010	3-methylpyrazole (MP) determination by HPLC
EN 16024:2011	1H-1,2,4-triazole determination by HPLC
EN 16075:2011	2-NPT determination by HPLC
EN 16328:2012	DMPP determination by HPLC
EN 16651:2015	NBPT and NPPT determination by HPLC
EN 17090:2018	DMPSA determination by HPLC
EN 1482-1 and EN 1482-3	Recommended sampling methods named in Clause 4

What does the kSIST FprEN 17752:2026 document contain?

kSIST FprEN 17752:2026 contains a short framework standard with a scope, references, terminology, sample handling rules, and compound-by-compound method references. It does not reproduce the full analytical procedures of the HPLC methods it cites.

Annex ZA contains Table ZA.1, which links the standard’s clauses to the relevant parts of Regulation (EU) 2019/1009. The bibliography lists the regulation itself and the companion sampling standards EN 1482-1 and EN 1482-3.

SLOVENSKI STANDARD
oSIST prEN 17752:2026
01-marec-2026
Anorganska gnojila - Določanje specifičnih inhibitorjev
Inorganic fertilizers - Determination of specific inhibiting compounds
Anorganische Düngemittel - Bestimmung spezifischer Hemmstoffe
Engrais inorganiques - Détermination des composés inhibiteurs spécifiques
Ta slovenski standard je istoveten z: prEN 17752
ICS:
65.080 Gnojila Fertilizers
oSIST prEN 17752:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 17752:2026
oSIST prEN 17752:2026
DRAFT
EUROPEAN STANDARD
prEN 17752
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2026
ICS 65.080 Will supersede CEN/TS 17752:2022
English Version
Inorganic fertilizers - Determination of specific inhibiting
compounds
Engrais inorganiques - Détermination des composés Anorganische Düngemittel - Bestimmung spezifischer
inhibiteurs spécifiques Hemmstoffe
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 260.
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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17752:2026 E
worldwide for CEN national Members.

oSIST prEN 17752:2026
prEN 17752:2026 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Sampling and sample preparation . 6
4.1 Sampling . 6
4.2 Sample preparation . 6
5 Determination of specific inhibiting compounds . 6
5.1 Determination of the nitrification inhibiting compound content . 6
5.1.1 Determination of dicyandiamide . 6
5.1.2 Determination of 3-methylpyrazole (MP) . 6
5.1.3 Determination of 1H-1,2,4-triazole . 6
5.1.4 Determination of 3,4-dimethyl-1H-pyrazole phosphate (DMPP) . 6
5.1.5 Determiantion of 2-(3,4-dimethyl-pyrazol-1-yl)-succinic acid (DMPSA) . 6
5.2 Determination of the urease inhibiting compound content . 7
5.2.1 Determination of N-(n-butyl)thiophosphoric triamide (NBPT) . 7
5.2.2 Determination of N-(2-nitrophenyl)phosphoric triamide (2-NPT) . 7
5.2.3 Determination of N-(n-butyl)thiophosphoric triamide (NBPT) and N-(n-
propyl)thiophosphoric triamide (NPPT) . 7
Annex ZA (informative) Relationship of this European Standard and the essential requirements
of Regulation (EU) 2019/1009 making available on the market of EU fertilising products
aimed to be covered . 8
Bibliography . 9

oSIST prEN 17752:2026
prEN 17752:2026 (E)
European foreword
This document (prEN 17752:2026) has been prepared by Technical Committee CEN/TC 260 “Fertilizers
and liming materials”, the secretariat of which is held by DIN.
This document is currently submitted to CEN Enquiry.
This document will supersede CEN/TS 17752:2022.
Compared to the previous edition, prEN 17752:2025 includes the following significant technical changes:
a) the CEN Technical Specification has been adopted as a European Standard including the addition of
Annex ZA;
b) the Scope (Clause 1) has been updated with respect to fertilizing product blends;
c) the normative references (Clause 2) and the Bibliography have been updated.
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.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
oSIST prEN 17752:2026
prEN 17752:2026 (E)
Introduction
Regulation (EU) 2019/1009 [1] lays down the rules on the making available on the market of EU
fertilizing products and the specific safety and quality requirements for the defined product function
categories (PFCs). Inorganic fertiliziers have been classified into PFC 1(C).
The specific safety and quality requirements are defined in this document as well as normative references
of the test methods to be used in order to measure the compliance with the related parameter in the
Regulation (EU) 2019/1009 [1].

oSIST prEN 17752:2026
prEN 17752:2026 (E)
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