FprEN 17752
(Main)Inorganic fertilizers - Determination of specific inhibiting compounds
- 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
- Publication Date
- 13-Jan-2027
- Technical Committee
- CEN/TC 260 - Fertilizers and liming materials
- Drafting Committee
- CEN/TC 260/WG 7 - Chemical analysis
- Current Stage
- 5020 - Submission to Vote - Formal Approval
- Start Date
- 24-Sep-2026
- Due Date
- 20-Sep-2027
- Completion Date
- 24-Sep-2026
FprEN 17752 is a CEN draft European Standard for inorganic fertilizers. It specifies which analytical methods to use for determining nitrification inhibiting compounds and urease inhibiting compounds, so laboratories and fertilizer producers can check these substances in practice. It does not apply to fertilizing product blends.
What does FprEN 17752 specify?
FprEN 17752 specifies references to methods for determining specific inhibiting compounds in inorganic fertilizers. It organizes the subject into sampling, sample preparation, nitrification inhibitor determination, urease inhibitor determination, and an informative Annex ZA linking the standard to EU fertilising-product legislation.
| Annex | What it covers |
|---|---|
| Annex ZA | Relationship between FprEN 17752 and the essential requirements of Regulation (EU) 2019/1009 |
The scope is limited to inorganic fertilizers, so users should not apply it to fertilizing product blends. In practice, that matters when choosing the right test route for a product formulation before reporting results or assessing conformity.
What are the key requirements of FprEN 17752?
FprEN 17752 is mainly a reference standard: it tells users which clauses and which separate EN methods to apply for each compound. The most important practical point is that it does not create one new test method for all inhibitors, but points to existing HPLC-based methods for each named substance.
Sampling and sample preparation
Clause 4 says sampling is not part of the method in this document. It also stresses that the laboratory sample must be representative and not altered during transport or storage, and that sample preparation shall follow EN 1482-2:2024. That means the analytical result depends on getting a proper sample to the lab before any measurement begins.
Nitrification inhibiting compounds
Clause 5.1 lists the nitrification inhibiting compounds covered: dicyandiamide, 3-methylpyrazole (MP), 1H-1,2,4-triazole, 3,4-dimethyl-1H-pyrazole phosphate (DMPP), and 2-(3,4-dimethyl-pyrazol-1-yl)-succinic acid (DMPSA). Each one is measured by a named EN method, so the user selects the right reference method for the compound present in the fertilizer.
For DMPP and DMPSA, the cited methods report results in mg/kg, while Regulation (EU) 2019/1009 expects a mass fraction in %. The document gives the conversion note, which matters when a laboratory result is used for regulatory reporting or product declarations.
Urease inhibiting compounds
Clause 5.2 covers urease inhibiting compounds. It points to methods for N-(n-butyl)thiophosphoric triamide (NBPT), N-(2-nitrophenyl)phosphoric triamide (2-NPT), and the combined determination of NBPT and N-(n-propyl)thiophosphoric triamide (NPPT). In practice, this lets a lab choose whether it needs a single-compound result or a combined determination.
EU conformity link
Annex ZA maps Clause 4 and Clause 5 to the essential safety requirements in Regulation (EU) 2019/1009 for PFC 1 inorganic fertilizers. That link matters for manufacturers and conformity assessment because it shows which parts of the standard support presumption of conformity when the standard is cited in the OJEU.
What terms does FprEN 17752 define?
FprEN 17752 uses the terms and definitions from EN 12944-1 and EN 12944-2. The document also relies on a set of named compounds and abbreviations that are central to the test scope.
- HPLC - High-performance liquid chromatography, the analytical technique used by the cited determination methods.
- NBPT - N-(n-butyl)thiophosphoric triamide, a urease inhibiting compound covered by the document.
- NPPT - N-(n-propyl)thiophosphoric triamide, determined together with NBPT in one cited method.
- 2-NPT - N-(2-nitrophenyl)phosphoric triamide, a urease inhibiting compound covered for urea and urea-containing fertilizers.
- MP - 3-methylpyrazole, one of the nitrification inhibiting compounds covered.
- DMPP - 3,4-dimethyl-1H-pyrazole phosphate, a nitrification inhibiting compound with a conversion note for regulatory reporting.
- DMPSA - 2-(3,4-dimethyl-pyrazol-1-yl)-succinic acid, a nitrification inhibiting compound covered by a separate HPLC method.
Who uses FprEN 17752?
FprEN 17752 is used by laboratories, fertilizer manufacturers, and conformity assessment teams that need to measure inhibitor content in inorganic fertilizers. It is also relevant to quality managers and buyers who specify test methods in contracts or product release procedures. The document supports work tied to EU fertilising-product compliance, especially for products in PFC 1(C).
What changed in FprEN 17752 from the previous edition?
FprEN 17752 will supersede CEN/TS 17752:2022. Compared with that edition, the foreword states these changes: the Technical Specification has been adopted as a European Standard with Annex ZA added, the scope has been updated regarding fertilizing product blends, and the normative references and bibliography have been updated.
Which standards are used with FprEN 17752?
FprEN 17752 relies on several cited standards for definitions, sampling, sample preparation, and compound-specific testing. EN 1482-2:2024 provides general sample preparation provisions, while EN 12944-1 and EN 12944-2 provide the vocabulary used in the document. The compound methods are EN 15360, EN 15688, EN 15905, EN 16024, EN 16075, EN 16328, EN 16651, and EN 17090, all based on HPLC.
The bibliography also points to EN 1482-1 and EN 1482-3 for recommended sampling approaches. In practice, that helps users build a complete sampling and test workflow even though sampling itself is not part of the method in Clause 4.
What does the FprEN 17752 document contain?
FprEN 17752 is structured as a short referencing standard rather than a full laboratory method. It contains a scope, normative references, vocabulary, sampling and sample-preparation guidance, the list of nitrification and urease inhibiting compounds with the corresponding EN test methods, and Annex ZA linking the standard to Regulation (EU) 2019/1009. The bibliography adds the EU regulation and the companion sampling standards.
Relations
- Effective Date
- 03-Jul-2024
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Frequently Asked Questions
FprEN 17752 is a draft published by the European Committee for Standardization (CEN). Its full title is "Inorganic fertilizers - Determination of specific inhibiting compounds". This standard covers: 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.
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.
FprEN 17752 is classified under the following ICS (International Classification for Standards) categories: 65.080 - Fertilizers. The ICS classification helps identify the subject area and facilitates finding related standards.
FprEN 17752 has the following relationships with other standards: It is inter standard links to CEN/TS 17752:2022. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
FprEN 17752 is associated with the following European legislation: EU Directives/Regulations: 2019/1009; Standardization Mandates: M/564, M/564 Amd 1, M/564 Amd 2. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
FprEN 17752 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
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)
...