FprEN 15925

• Abstract:

  This document specifies a method for the extraction of the total sulfur contained in fertilizers in elemental form and/or in other chemical combinations.; The method is applicable to inorganic fertilizers for which a declaration of the total sulfur present in various forms (elemental, thiosulfate, sulfite, sulfate) is provided.

• Status: Not Published
• Publication Date: 13-Jan-2027
• ICS: 65.080 - Fertilizers
• Technical Committee: CEN/TC 260 - Fertilizers and liming materials
• Drafting Committee: CEN/TC 260/WG 7 - Chemical analysis
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 16-Jul-2026
• Due Date: 01-Jan-2027
• Completion Date: 16-Jul-2026
• Directive: Harmonized Standard2019/1009 - 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 15925:2026 - Inorganic fertilizers - Extraction of total sulfur present in various forms

• Revises: EN 15925:2011 - Fertilizers - Extraction of total sulfur present in various forms
• Effective Date: 02-Apr-2025

Overview

FprEN 15925: Inorganic fertilizers - Extraction of total sulfur present in various forms is a draft European Standard developed by CEN/TC 260, focusing on fertilizers and liming materials. This standard specifies a systematic method for extracting the total sulfur content present in inorganic fertilizers, whether in elemental form or various chemical combinations such as thiosulfate, sulfite, or sulfate. Its primary target is the industry’s need for reliable sulfur analysis, ensuring accurate declarations of sulfur content for compliance, labeling, and quality control.

By standardizing the extraction procedure, FprEN 15925 improves analytical consistency and supports the regulatory and commercial needs surrounding inorganic fertilizers across Europe.

Key Topics

• Total Sulfur Extraction: Provides a detailed approach for converting all sulfur in a fertilizer sample, regardless of its form, into sulfate for precise quantification.
• Applicable Sulfur Forms: Addresses the extraction of sulfur in different chemical forms, including:
  • Elemental sulfur
  • Thiosulfate
  • Sulfite
  • Sulfate
• Analytical Requirements: Specifies quality parameters for reagents and the analytical-grade distilled or demineralized water to ensure data reliability.
• Sample Preparation: Stresses the importance of sample homogeneity and the use of recognized sampling and preparation practices for representative analysis.
• Reporting Procedures: Outlines what constitutes a compliant test report, supporting transparency and repeatability in results.

Applications

FprEN 15925 is essential for stakeholders in the fertilizer industry, regulatory agencies, and analytical laboratories. Its practical applications include:

• Quality Control: Fertilizer manufacturers use the standard to verify and declare total sulfur content, ensuring product consistency and compliance with labeling requirements.
• Regulatory Compliance: Helps organizations meet legal obligations related to the sulfur content of inorganic fertilizers distributed within the European Economic Area.
• Trade and Certification: Facilitates fair trade and certification processes by providing a unified methodology for sulfur analysis, minimizing disputes and ensuring product comparability.
• Research and Development: Supports R&D activities focused on formulation improvements and innovation in fertilizer products by providing reliable sulfur measurement protocols.
• Environmental Monitoring: Laboratories and environmental agencies can use the procedure for monitoring sulfur levels in agricultural products impacting soil health and crop productivity.

Related Standards

To ensure comprehensive fertilizer quality assessment and sampling procedures, several related standards are referenced in FprEN 15925:

• EN 1482-1: Fertilizers, liming materials and inhibitors - Sampling and sample preparation - Part 1: General sampling provisions.
• EN 1482-2: Fertilizers, liming materials and inhibitors - Sampling and sample preparation - Part 2: General sample preparation provisions.
• EN 12944-1: Fertilizers and liming materials - Vocabulary - Part 1: General terms.
• EN 12944-2: Fertilizers and liming materials - Vocabulary - Part 2: Terms relating to fertilizers.
• EN 15749: Fertilizers - Determination of sulfates content using three different methods.

Conclusion

Implementing FprEN 15925 ensures that inorganic fertilizer products are analyzed for total sulfur content using a robust, proven extraction method. By bridging industry needs with regulatory standards, the document supports accuracy, trust, and consistency in fertilizer quality declaration and market compliance throughout Europe. Adopting this standard strengthens both operational reliability and consumer confidence in fertilizer products.

SLOVENSKI STANDARD
01-februar-2026
Anorganska gnojila - Ekstrakcija celotnega žvepla v različnih oblikah
Inorganic fertilizers - Extraction of total sulfur present in various forms
Anorganische Düngemittel - Extraktion von Gesamtschwefel, der in verschiedener Form
vorliegen kann
Engrais inorganiques - Extraction du soufre total présent sous différentes formes
Ta slovenski standard je istoveten z: prEN 15925
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 15925
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2025
ICS 65.080 Will supersede EN 15925:2011
English Version
Inorganic fertilizers - Extraction of total sulfur present in
various forms
Engrais inorganiques - Extraction du soufre total Anorganische Düngemittel - Extraktion von
présent sous différentes formes Gesamtschwefel, der in verschiedener Form vorliegen
kann
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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15925:2025 E
worldwide for CEN national Members.

prEN 15925:2025 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Sampling and sample preparation . 4
5 Principle . 4
6 Reagents . 4
7 Apparatus . 5
8 Procedure . 5
8.1 Test portion . 5
8.2 Oxidation . 5
8.3 Preparation of the solution to be analysed . 5
9 Test report . 6
Bibliography . 7

prEN 15925:2025 (E)
European foreword
This document (prEN 15925:2025) 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 EN 15925:2011.
This document includes the following significant technical changes with respect to EN 15925:2011:
a) reference to EC fertilizer removed;
b) quality parameters for distilled water added;
c) clarification for covering with watch gl
...