Fertilizers - Extraction of total sulfur present in various forms

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 EC fertilizers for which a declaration of the total sulfur present in various forms (elemental, thiosulfate, sulfite, sulfate) is provided.

Düngemittel - Extraktion von Gesamtschwefel, der in verschiedener Form vorliegen kann

Das vorliegende Dokument legt ein Verfahren für die Extraktion von Gesamtschwefel fest, der in elementarer Form und/oder in anderen chemischen Verbindungen in Düngemitteln enthalten ist.
Das Verfahren gilt für EG Düngemittel, für die eine Angabe des Gesamtschwefels vorgeschrieben ist, der in verschiedenen Formen (als elementarer Schwefel, Thiosulfat, Sulfit, Sulfat) vorhanden ist.

Engrais - Extraction du soufre total présent sous différentes formes

Le présent document fixe une méthode pour l’extraction du soufre total contenu dans les engrais sous forme élémentaire et/ou sous forme d’autres combinaisons chimiques.
Cette méthode s’applique aux engrais CE pour lesquels est prévue une déclaration du soufre total lorsque cet élément est présent sous différentes formes (élémentaire, thiosulfate, sulfite, sulfate).

Gnojila - Ekstrakcija celotnega žvepla v različnih oblikah

Ta dokument opredeljuje metodo ekstrakcije celotnega žvepla, vsebovanega v gnojilih v elementarni obliki in/ali drugih kemičnih oblikah.
Ta metoda velja za gnojila ES, za katera je predpisana deklaracija o celotnem žveplu v različnih oblikah (elementarna, tiosulfatna, sulfitna, sulfatna).

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 15925:2011 - Fertilizers - Extraction of total sulfur present in various forms

Relations

Replaces
CEN/TS 15925:2009 - Fertilizers - Extraction of total sulfur present in various forms
Effective Date
01-Oct-2011
Revised
prEN 15925 - Inorganic fertilizers - Extraction of total sulfur present in various forms
Effective Date
02-Apr-2025

Overview

EN 15925:2011 (CEN) specifies a laboratory method for the extraction of total sulfur present in fertilizers in elemental form and in other chemical combinations (elemental S, thiosulfate, sulfite, sulfate). Adopted as a European Standard in 2011, the method is intended for EC fertilizers for which a declaration of sulfur present in various forms is required. The procedure converts all sulfur forms to sulfate and determines sulfate by precipitation as barium sulfate.

Key Topics and Requirements

  • Scope: Extraction of total sulfur in fertilizers; applicable when a declaration of sulfur forms (elemental, thiosulfate, sulfite, sulfate) is provided.
  • Principle: Elemental sulfur is converted in an alkaline medium to polysulfides and thiosulfate; these plus any sulfites are oxidized with hydrogen peroxide to sulfate. Sulfate is quantified by precipitation of barium sulfate.
  • Reagents: Analytical grade reagents and distilled/demineralized water; examples specified include diluted HCl (1:1), NaOH solution (≥30 %), hydrogen peroxide (30 %), and BaCl2 solution (~122 g/L as BaCl2·2H2O).
  • Apparatus: Electric hot plate, specified beakers (400 ml, 600 ml), 250 ml volumetric flask and standard laboratory glassware.
  • Procedure highlights:
    • Test portion sized to contain 80–350 mg S (or 200–875 mg SO3); typical 2.5 g when S < 15 %.
    • Alkaline boiling (NaOH + water), followed by oxidation with incremental additions of H2O2 (typically 6–8 ml) and further heating/standing steps.
    • Acidification with diluted HCl, filtration strategy depends on expected sulfur content (<5 % or ≥5 %), and sulfate determination on the filtrate per EN 15749.
  • Reporting: Test report must reference EN 15925, identify the sample, record sampling/preparation dates and details, and note any deviations or incidents.

Applications and Users

  • Quality control and compliance testing in fertilizer manufacturing and blending operations.
  • Accredited analytical laboratories performing fertilizer composition analysis.
  • Regulatory bodies and conformity assessment laboratories verifying declarations for EC fertilizers under EU fertilizer regulations.
  • Agricultural testing services and import/export inspectors who need reliable measurement of total sulfur and sulfur species conversion.

Related Standards

  • EN 15749 - Determination of sulfates (used for final sulfate measurement)
  • EN 1482-1 / EN 1482-2 - Sampling and sample preparation for fertilizers
  • EN 12944-1 / EN 12944-2 - Vocabulary for fertilizers and soil improvers
  • Regulation (EC) No 2003/2003 - Fertiliser regulation (reference to method annex)

Keywords: EN 15925:2011, fertilizers, total sulfur extraction, sulfate determination, CEN, elemental sulfur, thiosulfate, analytical method, fertilizer testing.

Frequently Asked Questions

EN 15925:2011 is a standard published by the European Committee for Standardization (CEN). Its full title is "Fertilizers - Extraction of total sulfur present in various forms". This standard covers: 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 EC fertilizers for which a declaration of the total sulfur present in various forms (elemental, thiosulfate, sulfite, sulfate) is provided.

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 EC fertilizers for which a declaration of the total sulfur present in various forms (elemental, thiosulfate, sulfite, sulfate) is provided.

EN 15925:2011 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 15925:2011 has the following relationships with other standards: It is inter standard links to CEN/TS 15925:2009, prEN 15925. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

EN 15925:2011 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 15925:2011 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.Düngemittel - Extraktion von Gesamtschwefel, der in verschiedener Form vorliegen kannEngrais - Extraction du soufre total présent sous différentes formesFertilizers - Extraction of total sulfur present in various forms65.080GnojilaFertilizersICS:Ta slovenski standard je istoveten z:EN 15925:2011SIST EN 15925:2011en,fr,de01-november-2011SIST EN 15925:2011SLOVENSKI
STANDARDSIST-TS CEN/TS 15925:20101DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15925
September 2011 ICS 65.080 Supersedes CEN/TS 15925:2009English Version
Fertilizers - Extraction of total sulfur present in various forms
Engrais - Extraction du soufre total présent sous différentes formes
Düngemittel - Extraktion von Gesamtschwefel, der in verschiedener Form vorliegen kann 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 15925:2011: ESIST EN 15925:2011
...

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