prEN 17759

Inorganic fertilizers - Determination of pH of a solution of ammonium nitrate fertilizers of high nitrogen content

This document specifies a method for the determination of pH of a solution of ammonium nitrate fertilizer of high nitrogen content.
This document is applicable to the fertilizing products blends where a blend is a mix of at least two of the following components: fertilizers, liming materials, soil improvers, growing media, inhibitors, plant biostimulants, and where the following category: inorganic fertilizers is the highest % in the blend by mass or volume, or in the case of liquid form by dry mass. If inorganic fertilizer is not the highest % in the blend, the European Standard for the highest % of the blend applies. In case a fertilizing product blend is composed of components in equal quantity, the user decides which standard to apply. Variations in analytical methods for fertilizing product blends can lead to differing results as some components or matrix interactions can affect the outcome. Validation procedures have shown that developed standard methods are robust and reliable across diverse product compositions, but possible interferences and unexpected results when analysing fertilizing product blends are possible.

Anorganische Düngemittel - Bestimmung des pH-Wertes in einer Lösung mit Ammoniumnitratdüngemitteln mit hohem Stickstoffgehalt

Dieses Dokument legt ein Verfahren zur Bestimmung des pH-Werts in einer Lösung eines Ammoniumnitratdüngemittels mit hohem Stickstoffgehalt fest.
Dieses Dokument ist für Düngeproduktmischungen anwendbar, wenn die Mischung aus mindestens zwei der folgenden Komponenten besteht: Düngemittel, Kalkdünger, Bodenverbesserungsmittel, Kultursubstrate, Hemmstoffe, Biostimulanzien und wenn die Kategorie „anorganische Düngemittel“ den höchsten Prozentsatz in der Mischung bezüglich Masse oder Volumen, oder im Falle von flüssigen Formen bezüglich Trockenmasse ausmacht. Wenn das anorganische Düngemittel nicht den höchsten Prozentsatz in der Mischung ausmacht, gilt die Europäische Norm für den höchsten Prozentsatz der Mischung. Falls eine Düngemittelproduktmischung aus Bestandteilen gleicher Menge besteht, entscheidet der Anwender, welche Norm angewendet wird. Variationen in analytischen Verfahren für Düngeproduktmischungen können zu unterschiedlichen Ergebnissen führen, da einige Komponenten oder Matrixwechselwirkungen das Ergebnis beeinflussen können. Validierungen haben gezeigt, dass die entwickelten Standardverfahren robust und zuverlässig über unterschiedliche Produktzusammensetzungen hinweg sind. Jedoch sind mögliche Interferenzen und unerwartete Ergebnisse bei der Analyse von Düngeproduktmischungen möglich.

Engrais inorganiques - Détermination du pH d'une solution d'engrais à base de nitrate d'ammonium à forte teneur en azote

Le présent document spécifie une méthode de détermination du pH d'une solution d'engrais à base de nitrate d'ammonium à forte teneur en azote.
Le présent document est applicable aux mélanges de fertilisants constitués d'au moins deux des composants suivants: engrais, amendements minéraux basiques, amendements du sol, supports de culture, inhibiteurs, biostimulants des végétaux, et dans lesquels la catégorie « engrais inorganiques » représente le pourcentage le plus élevé du mélange en masse ou en volume, ou dans le cas d'un liquide, en masse sèche. Si l'engrais inorganique ne représente pas le pourcentage le plus élevé du mélange, la Norme européenne relative au pourcentage le plus élevé du mélange s'applique. Dans le cas où le mélange de fertilisants est constitué de composants en quantités égales, l'utilisateur décide quelle norme appliquer. Les variations dans les méthodes d'analyse des mélanges de fertilisants peuvent conduire à des résultats différents, car certaines interactions de composants ou de la matrice peuvent affecter le résultat. Les procédures de validation ont montré que les méthodes normalisées développées sont robustes et fiables pour diverses compositions de produits, mais des interférences éventuelles et des résultats inattendus lors de l'analyse des mélanges de fertilisants sont possibles.

Anorganska gnojila - Določanje pH-vrednosti raztopine gnojil iz amonijevega nitrata z veliko vsebnostjo dušika

General Information

• Status: Not Published
• Publication Date: 28-Feb-2028
• ICS: 65.080 - Fertilizers
• Technical Committee: CEN/TC 260 - Fertilizers and liming materials
• Drafting Committee: CEN/TC 260/WG 7 - Chemical analysis
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 12-Mar-2026
• Due Date: 13-Oct-2026
• Completion Date: 12-Mar-2026
• Directive: Not Harmonized2019/1009 - 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: oSIST prEN 17759:2026 - Inorganic fertilizers - Determination of pH of a solution of ammonium nitrate fertilizers of high nitrogen content

Relations

• Revises: CEN/TS 17759:2022 - Inorganic fertilizers - Determination of pH of a solution of ammonium nitrate fertilizers of high nitrogen content
• Effective Date: 01-May-2024

Overview

prEN 17759 is a European draft standard developed by CEN, detailing the procedure for the determination of pH in a solution of ammonium nitrate fertilizers with high nitrogen content. This standard is essential for ensuring the consistent quality and safety of inorganic fertilizers, particularly those based on ammonium nitrate. It applies to pure ammonium nitrate fertilizers as well as blends where inorganic fertilizers are the dominant component by mass or volume.

This harmonized method aims to support regulatory compliance, product development, quality assurance, and accurate labeling by providing a clear, reproducible approach to pH analysis in fertilizer products.

Key Topics

• Fertilizer Blends Applicability

  • Applies to blends containing at least two components (e.g., fertilizers, liming materials, soil improvers, plant biostimulants).
  • The standard is used when inorganic fertilizers have the highest proportion in the blend.
  • When blend proportions are equal, the end user selects the appropriate standard.

• Analytical Reliability and Interferences

  • Recognizes potential interferences when testing blends or complex matrices.
  • Validated through inter-laboratory studies for robustness and reliability, yet unexpected results are possible with certain product compositions.

• Specified Analytical Method

  • Outlines the principle of measuring pH using a calibrated pH meter.
  • Details required reagents (distilled water, buffer solutions), apparatus, and procedural steps for consistent measurement.
  • Includes provisions for calibration, sampling, and precise expression of results.

• Reporting and Traceability

  • Requires full documentation of sampling, preparation, temperature, and unique test details.
  • Adherence to documented repeatability and reproducibility limits, supporting traceability for audits or regulatory review.

Applications

The standardized method described in prEN 17759 is vital for:

• Fertilizer Manufacturers

  • Ensuring products meet EU and national quality and safety requirements.
  • Supporting accurate product labeling and claims regarding fertilizer chemistry.
  • Facilitating consistent batch production and quality control processes.

• Testing Laboratories

  • Providing a recognized, harmonized procedure for analytical services.
  • Guaranteeing comparability of results across different labs and regions.

• Regulatory Compliance and Market Access

  • Assisting compliance with the European Fertilizing Products Regulation (FPR).
  • Enabling easier product placement on European and international markets.

• Research and Development

  • Supporting innovation in fertilizer formulations and new blend development.
  • Validating new products or modifications to existing ammonium nitrate fertilizers.

Related Standards

For a comprehensive approach to fertilizer testing and standardization, the following related standards should be considered:

• EN 1482-1 / EN 1482-2: Fertilizers, liming materials and inhibitors – Sampling and sample preparation

  • Part 1: General sampling provisions
  • Part 2: General sample preparation provisions

• prEN 12944-1 / prEN 12944-2: Fertilizers, liming materials and inhibitors – Vocabulary

  • Part 1 and Part 2: General terms and those relating to fertilizers

• ISO 5725-1 / ISO 5725-2: Accuracy of measurement methods

  • Definitions, repeatability, and reproducibility requirements for laboratory practice

These standards, used in conjunction with prEN 17759, establish a robust framework for the standardized analysis and production of inorganic fertilizers, ensuring quality, safety, and regulatory alignment within the agricultural sector.

Keywords: prEN 17759, inorganic fertilizers, ammonium nitrate, determination of pH, fertilizer blends, European Standard, CEN, fertilizer quality control, laboratory method, fertilizer testing, fertilizer regulation, agricultural standards.

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2026
Anorganska gnojila - Določanje pH-vrednosti raztopine gnojil iz amonijevega
nitrata z veliko vsebnostjo dušika
Inorganic fertilizers - Determination of pH of a solution of ammonium nitrate fertilizers of
high nitrogen content
Anorganische Düngemittel - Bestimmung des pH-Wertes in einer Lösung mit
Ammoniumnitratdüngemitteln mit hohem Stickstoffgehalt
Engrais inorganiques - Détermination du pH d'une solution d'engrais à base de nitrate
d'ammonium à forte teneur en azote
Ta slovenski standard je istoveten z: prEN 17759
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
March 2026
ICS 65.080 Will supersede CEN/TS 17759:2022
English Version
Inorganic fertilizers - Determination of pH of a solution of
ammonium nitrate fertilizers of high nitrogen content
Engrais inorganiques - Détermination du pH d'une Anorganische Düngemittel - Bestimmung des pH-
solution d'engrais à base de nitrate d'ammonium à Wertes in einer Lösung mit
forte teneur en azote Ammoniumnitratdüngemitteln mit hohem
Stickstoffgehalt
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 17759:2026 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
5.1 Distilled or demineralized water . 4
5.2 Buffer solution A . 4
6 Apparatus and equipment . 5
6.1 pH meter . 5
6.2 Graduated flask . 5
6.3 Beaker . 5
6.4 Balance . 5
6.5 Airtight vessel . 5
7 Sampling and sample preparation . 5
7.1 Sampling . 5
7.2 Sample preparation . 5
8 Procedure . 5
8.1 Calibration of the pH meter . 5
8.2 Determination . 5
9 Expression of the results . 5
10 Precision . 6
10.1 Inter-laboratory study . 6
10.2 Repeatability . 6
10.3 Reproducibility . 6
11 Test report . 6
Annex A (informative) Results of the inter-laboratory study . 7
A.1 Inter-laboratory study . 7
A.2 Statistical results . 7
Bibliography . 9

European foreword
This document (prEN 17759:2026) 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 17759:2022.
CEN/TS 17759:2022:
a) the CEN Technical Specification has been adopted as a European Standard;
b) update of Scope (Clause 1);
c) update of Normative references (Clause 2);
d) Sampling and sample preparation (Clause 7) has been updated;
e) the use of a nitrogen stream during calibration and measurement (8.1) has been removed;
f) Clause 10 (Precision) and Annex A including results of inter-laboratory study added;
g) update of Bibliography.
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 the
...