Fertilizers - Extraction of phosphorus soluble in mineral acids

This document specifies a method for the determination of phosphorus soluble in mineral acids.
The method is applicable exclusively to phosphate fertilizers listed in Regulation (EC) 2003/2003, Annex I (see [2]).

Düngemittel - Extraktion des in Mineralsäuren löslichen Phosphors

Dieses Dokument legt ein Verfahren zur Bestimmung des in Mineralsäuren löslichen Phosphors fest.
Das Verfahren gilt ausschließlich für die in der Verordnung (EG) 2003/2003, Anhang I [2] aufgeführten Phosphatdünger.

Engrais - Extraction du phosphore soluble dans les acides minéraux

Le présent document spécifie une méthode de dosage du phosphore soluble dans des acides minéraux.
La méthode est exclusivement applicable aux engrais phosphatés listés dans le règlement (CE) 2003/2003, Annexe I (voir [2]).

Gnojila - Ekstrakcija fosforja, topnega v mineralnih kislinah

Ta dokument opredeljuje metodo določanja fosforja, topnega v mineralnih kislinah.
Metoda velja izključno za fosfatna gnojila, navedena v Prilogi I (glej [1]) Uredbe (ES) 2003/2003.

General Information

Status
Published
Publication Date
27-Sep-2011
Withdrawal Date
30-Mar-2012
ICS
65.080 - Fertilizers
Technical Committee
CEN/TC 260 - Fertilizers and liming materials
Drafting Committee
CEN/TC 260/WG 7 - Chemical analysis
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
20-Jun-2023
Completion Date
14-Apr-2025
Directive
2003/2003 - Regulation (EC) N° 2003/2003 of the European Parlament and of the council of 13 October 2003 relating to fertilisers
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
Mandate
M/335 - Standardization Mandate assigned to the CEN concerning the modernisation of the methods of anylysis of Fertilizers
Ref Project
SIST EN 15956:2011 - Fertilizers - Extraction of phosphorus soluble in mineral acids

Relations

Replaces
CEN/TS 15956:2009 - Fertilizers - Extraction of phosphorus soluble in mineral acids
Effective Date
01-Oct-2011
Revised
prEN 15956 - Inorganic fertilizers - Extraction of phosphorus soluble in mineral acids
Effective Date
02-Apr-2025

Overview

EN 15956:2011 (CEN) specifies a laboratory method for the determination of phosphorus soluble in mineral acids in phosphate fertilizers listed in Regulation (EC) 2003/2003, Annex I. The standard sets out the principle, required reagents and apparatus, a stepwise extraction procedure, and minimum reporting requirements to ensure consistent, comparable results for quality control and regulatory compliance.

Keywords: EN 15956:2011, phosphorus soluble in mineral acids, phosphate fertilizers, extraction method, Reg. EC 2003/2003, quality control, compliance testing.

Key Topics

  • Scope and applicability: Method applicable exclusively to phosphate fertilizers referenced in Regulation (EC) 2003/2003, Annex I.
  • Principle: Extraction of phosphorus from the fertilizer matrix using a controlled mixture of nitric acid and sulfuric acid under specified conditions.
  • Reagents: Distilled or demineralized water; sulfuric acid (density approx. 1.84 g·ml−1); nitric acid (density approx. 1.40 g·ml−1).
  • Apparatus: Standard laboratory equipment, Kjeldahl flask (≥ 500 ml) or 250 ml round-bottomed flask with reflux, 500 ml graduated flask, and a phosphate-free dry pleated filter.
  • Procedure highlights: A 2.5 g test portion is suspended in water, treated with specific volumes of nitric and sulfuric acid, boiled for defined intervals, diluted and filtered to produce the extract for analysis.
  • Reporting requirements: Identification of the sample, reference to EN 15956:2011, test results, sampling and analysis dates, repeatability statement, and any procedural deviations or incidents.

Applications

This extraction method is primarily used by:

  • Fertilizer manufacturers for quality control of phosphate fertilizers.
  • Test laboratories performing regulatory compliance testing under EU fertilizer legislation (Reg. EC 2003/2003).
  • Product development teams assessing phosphorus availability and labeling requirements.

Practical benefits include:

  • Consistent, comparable test results across laboratories that adopt EN 15956:2011.
  • A clear, documented procedure that supports traceability and auditability of phosphorus determinations.

Related Standards

  • EN 1482-1: Sampling and sample preparation - Part 1: Sampling (recommended sampling method).
  • EN 1482-2: Sampling and sample preparation - Part 2: Sample preparation (sample grinding and preparation guidance).
  • EN 12944-1 / EN 12944-2: Vocabulary for fertilizers and liming materials (terms and definitions referenced by EN 15956:2011).

For laboratories and stakeholders, EN 15956:2011 provides a focused, practical extraction protocol to determine phosphorus soluble in mineral acids, supporting product conformity, labeling accuracy, and regulatory adherence.

Frequently Asked Questions

EN 15956:2011 is a standard published by the European Committee for Standardization (CEN). Its full title is "Fertilizers - Extraction of phosphorus soluble in mineral acids". This standard covers: This document specifies a method for the determination of phosphorus soluble in mineral acids. The method is applicable exclusively to phosphate fertilizers listed in Regulation (EC) 2003/2003, Annex I (see [2]).

This document specifies a method for the determination of phosphorus soluble in mineral acids. The method is applicable exclusively to phosphate fertilizers listed in Regulation (EC) 2003/2003, Annex I (see [2]).

EN 15956:2011 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.

EN 15956:2011 has the following relationships with other standards: It is inter standard links to CEN/TS 15956:2009, prEN 15956. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN 15956:2011 is associated with the following European legislation: EU Directives/Regulations: 2003/2003, 2019/1009; Standardization Mandates: M/335. 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.

EN 15956:2011 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)


2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gnojila - Ekstrakcija fosforja, topnega v mineralnih kislinahDüngemittel - Extraktion des in Mineralsäuren löslichen PhosphorsEngrais - Extraction du phosphore soluble dans les acides minérauxFertilizers - Extraction of phosphorus soluble in mineral acids65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 15956:2011SIST EN 15956:2011en,fr,de01-november-2011SIST EN 15956:2011SLOVENSKI
STANDARDSIST-TS CEN/TS 15956:20101DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15956
September 2011 ICS 65.080 Supersedes CEN/TS 15956:2009English Version
Fertilizers - Extraction of phosphorus soluble in mineral acids
Engrais - Extraction du phosphore soluble dans les acides minéraux
Düngemittel - Extraktion des in Mineralsäuren löslichen Phosphors This European Standard was approved by CEN on 18 August 2011.
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. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.
This European Standard exists 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15956:2011: ESIST EN 15956:2011
...

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