FprEN 15957
(Main)Inorganic fertilizers - Extraction of phosphorus which is soluble in neutral ammonium citrate
General Information
- Abstract
This document specifies a method for the extraction of phosphorus soluble in neutral ammonium citrate in inorganic fertilizers.
- 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
- 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
Overview
FprEN 15957: Inorganic fertilizers - Extraction of phosphorus which is soluble in neutral ammonium citrate is a draft European Standard developed by CEN/TC 260. This document specifies a standardized analytical method for extracting phosphorus that is soluble in neutral ammonium citrate from inorganic fertilizers. The procedure ensures reliable, repeatable results that support fertilizer quality control, regulatory compliance, and product development in the agriculture and fertilizer industries. By using this method, laboratories and manufacturers can determine the amount of plant-available phosphorus in various inorganic fertilizer products.
Key Topics
- Phosphorus Extraction Method: The standard details the preparation, reagents, and conditions for extracting phosphorus using a neutral ammonium citrate solution at pH 7 and 65°C.
- Sample Preparation: Emphasis is placed on producing a homogeneous, representative laboratory sample, with preparation guidelines referencing EN 1482-2.
- Reagents and Equipment: Specifications are provided for reagent purity and specific apparatus, including pH meters and thermostatically controlled water baths.
- Test Procedure: Clear instructions are given on performing the extraction, filtration, and preparation of the test portion for analysis.
- Reporting Requirements: The standard outlines the minimum information required in the test report to ensure traceability and reproducibility.
Applications
The methods described in FprEN 15957 are used by:
- Fertilizer Manufacturers: To demonstrate the phosphorus content and quality of inorganic fertilizers for market approval and labeling.
- Analytical Laboratories: For routine testing of phosphorus availability in commercial fertilizer samples, ensuring compliance with industry and regulatory standards.
- Regulatory Bodies: To independently verify declared phosphorus contents as part of official inspection and compliance programs.
- Agricultural Consultants and Researchers: When evaluating fertilizer efficiency and plant nutrient availability in various cropping and soil contexts.
Using this standardized method increases confidence in the consistency and comparability of phosphorus measurements across the fertilizer industry, supporting informed decisions by farmers and stakeholders.
Related Standards
- 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 1482-1: Fertilizers, liming materials and inhibitors - Sampling and sample preparation - Part 1: General sampling provisions.
Practical Value
Implementing FprEN 15957 helps ensure:
- Product Integrity: Accurate determination of plant-available phosphorus supports compliance with product specifications and legal requirements.
- Market Confidence: Producers and consumers can trust the reliability of phosphorus data on fertilizer labels.
- Uniformity in Analysis: Laboratories across Europe can align on a harmonized, validated method, improving data consistency.
- Support for Sustainable Agriculture: Correct phosphorus assessments contribute to optimal fertilizer application, reducing waste and environmental impact.
Establishing a recognized method for extracting soluble phosphorus in neutral ammonium citrate makes FprEN 15957 essential for anyone involved in fertilizer production, analysis, regulation, or research.
Relations
- Revises
EN 15957:2011 - Fertilizers - Extraction of phosphorus which is soluble in neutral ammonium citrate - Effective Date
- 02-Apr-2025
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Frequently Asked Questions
FprEN 15957 is a draft published by the European Committee for Standardization (CEN). Its full title is "Inorganic fertilizers - Extraction of phosphorus which is soluble in neutral ammonium citrate". This standard covers: This document specifies a method for the extraction of phosphorus soluble in neutral ammonium citrate in inorganic fertilizers.
This document specifies a method for the extraction of phosphorus soluble in neutral ammonium citrate in inorganic fertilizers.
FprEN 15957 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 15957 has the following relationships with other standards: It is inter standard links to EN 15957:2011. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
FprEN 15957 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 15957 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
01-februar-2026
Anorganska gnojila - Ekstrakcija fosforja, topnega v amonijevem citratu v
nevtralnem mediju
Inorganic fertilizers - Extraction of phosphorus which is soluble in neutral ammonium
citrate
Anorganische Düngemittel - Extraktion des in neutralem Ammoniumcitrat löslichen
Phosphors
Engrais inorganiques - Extraction du phosphore soluble dans du citrate d’ammonium
neutre
Ta slovenski standard je istoveten z: prEN 15957
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
prEN 15957
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2025
ICS 65.080 Will supersede EN 15957:2011
English Version
Inorganic fertilizers - Extraction of phosphorus which is
soluble in neutral ammonium citrate
Engrais inorganiques - Extraction du phosphore Anorganische Düngemittel - Extraktion des in
soluble dans du citrate d'ammonium neutre neutralem Ammoniumcitrat löslichen Phosphors
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 15957:2025 E
worldwide for CEN national Members.
prEN 15957:2025 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Sampling and sample preparation . 4
6 Reagents . 4
7 Apparatus . 5
8 Procedure . 5
8.1 Test portion . 5
8.2 Extraction . 5
9 Test report . 6
Bibliography . 7
prEN 15957:2025 (E)
European foreword
This document (prEN 15957:2025) 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 15957:2011.
This document includes the following significant technical changes with respect to EN 15957:2011:
a) characteristics of distilled water added;
b) reference to Regulation (EC) No 2003/2003 removed.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States sub
...