SIST-TS CEN/TS 17782:2023

Fertilizing products - Determination of the stability of fertilizing products containing micronutrient chelates at different pHs

This document specifies a method for the determination of the soluble metal that remains in solution at different pHs after the application of a solution of the fertilizer substance containing micronutrient chelates in a tap water solution used as a reference.
The method applies to fertilizing products containing chelated micronutrients.

Düngeprodukte - Bestimmung der Stabilität von Spurennährstoffchelaten in Düngeprodukten bei verschiedenen pH Werten

Dieses Dokument legt ein Verfahren zur Bestimmung des löslichen Metalls fest, das nach der Anwendung einer Düngemittellösung, die Spurennährstoffchelate enthält, bei verschiedenen pH Werten in einer als Referenz verwendeten Leitungswasserlösung in Lösung bleibt.
Das Verfahren ist bei Düngeprodukten anwendbar, die chelatisierte Spurennährstoffe enthalten.

Fertilisants - Détermination de la stabilité des fertilisants contenant des oligo-éléments chélatés à différents pH

Le présent document spécifie une méthode pour la détermination, à différents pH, des métaux solubles qui restent en solution après l’ajout d’une solution de substance fertilisante contenant des oligo-éléments chélatés dans une eau du robinet de référence.
La méthode s’applique aux fertilisants contenant des oligo-éléments chélatés.

Sredstva za gnojenje - Določanje stabilnosti sredstev za gnojenje, ki vsebujejo kelate mikrohranil pri različnih pH-vrednostih

Ta dokument določa metodo za določanje topne kovine, ki ostane v raztopini pri različnih pH-vrednostih po nanosu raztopine gnojilne snovi, ki vsebuje kelate mikrohranil, v raztopini vode iz pipe, ki se uporablja kot referenca.
Metoda se uporablja za sredstva za gnojenje, ki vsebujejo kelatirana mikrohranila.

General Information

• Status: Published
• Public Enquiry End Date: 02-Jan-2022
• Publication Date: 09-Jan-2023
• ICS: 65.080 - Fertilizers
• Technical Committee: KAT - Soil quality
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Jan-2023
• Due Date: 13-Mar-2023
• Completion Date: 10-Jan-2023
• Directive: 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/564 - Fertilising products in support of Regulation (EU) 2019/1009
• Ref Project: CEN/TS 17782:2022 - Fertilizing products - Determination of the stability of fertilizing products containing micronutrient chelates at different pHs

Overview

SIST-TS CEN/TS 17782:2023 is a European Technical Specification developed by the European Committee for Standardization (CEN) that specifies a method for determining the stability of fertilizing products containing micronutrient chelates at different pH levels. This standardized test method is crucial for assessing the soluble metal content remaining in solution after interaction with a reference tap water solution mimicking real agricultural conditions. The specification targets fertilizers that contain chelated micronutrients such as iron (Fe), manganese (Mn), cobalt (Co), copper (Cu), and zinc (Zn).

Adopted for provisional application in 2022, this standard supports the agricultural industry's need to ensure micronutrient availability and product stability under varying soil pH environments. It aligns with the European Union’s regulations for fertilizing products and helps manufacturers demonstrate long-term micronutrient stability, improving product reliability and performance.

Key Topics

• Micronutrient Chelate Stability: Defines "ChSt" as the percentage of soluble micronutrient chelate remaining in reference tap water after three days at specific pH values.
• Test Principle: Samples of fertilizing products are dissolved and exposed to reference tap water buffered at different pHs. Post incubation, soluble metal content is measured using atomic absorption spectrometry (AAS) or inductively coupled plasma emission spectrometry (ICP).
• Reference Tap Water Composition: A buffered reference tap water simulates medium hardness water, containing calcium and magnesium ions to replicate interaction complexity.
• Reagents and Apparatus: The method requires carefully prepared reagents, including potassium hydroxide and nitric acid solutions, and precise equipment such as pH meters, thermostatic baths, and filtration units.
• Sample Preparation and Analysis: Procedures specify accurately weighing fertilizer samples, preparing solutions at designated pHs, filtration after three days’ incubation, and spectrometric determination of metal concentration.
• Calculation of Stability: Stability is quantified by comparing the soluble metal remaining with the initial chelated metal content, expressed as a percentage to indicate the product’s performance under test conditions.
• Interferences Consideration: Identification of possible interfering substances that could affect stability measurement, including other chelating or complexing agents not declared in the product.

Applications

• Agricultural Fertilizer Quality Control: Ensures long-lasting micronutrient availability in fertilizers used for soils, fertigation, and foliar applications.
• Product Development and Certification: Supports manufacturers in verifying compliance with EU fertilizing product regulations by assessing the chemical stability of micronutrient chelates.
• Research and Innovation: Facilitates optimization of chelating agents and fertilizing formulations by providing reliable stability data across a range of pH levels.
• Environmental Impact Assessment: Helps evaluate the behavior of micronutrient chelates in varying soil and water conditions, contributing to sustainable fertilizer practices.
• Reference for Testing Laboratories: Provides accredited labs with a standardized method for testing fertilizer samples to produce comparable and reliable data.

Related Standards

• EN 12944 Series: Vocabulary and terminology related to fertilizers and liming materials.
• EN 16963: Determination of micronutrients (boron, cobalt, copper, iron, manganese, molybdenum, and zinc) using inductively coupled plasma atomic emission spectrometry (ICP-AES).
• EN 16965: Determination of cobalt, copper, iron, manganese, and zinc using flame atomic absorption spectrometry (FAAS).
• CEN/TS 17786-1 & 17786-2: Methods to quantify chelated micronutrient content and different chelating agents in inorganic micronutrient fertilizers.
• EN ISO 3696: Specifications for water quality suitable for analytical laboratory use.

These complementary standards ensure comprehensive testing of fertilizer products, from terminology and composition to chemical analysis and quality assurance.

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Keywords: fertilizer stability, micronutrient chelates, fertilizer testing, European standard, fertilizing product stability, pH stability test, micronutrient availability, chelated micronutrients, agricultural fertilizers, CEN/TS 17782, fertilizer quality control, fertilizer regulations Europe.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2023
Sredstva za gnojenje - Določanje stabilnosti sredstev za gnojenje, ki vsebujejo
kelate mikrohranil pri različnih pH-vrednostih
Fertilizing products - Determination of the stability of fertilizing products containing
micronutrient chelates at different pHs
Düngeprodukte - Bestimmung der Stabilität von Spurennährstoffchelaten in
Düngeprodukten bei verschiedenen pH Werten
Fertilisants - Détermination de la stabilité des fertilisants contenant des oligo-éléments
chélatés à différents pH
Ta slovenski standard je istoveten z: CEN/TS 17782:2022
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17782
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
April 2022
TECHNISCHE SPEZIFIKATION
ICS 65.080
English Version
Fertilizing products - Determination of the stability of
fertilizing products containing micronutrient chelates at
different pHs
Fertilisants - Détermination de la stabilité des Düngeprodukte - Bestimmung der Stabilität von
fertilisants contenant des oligo-éléments chélatés à Spurennährstoffchelaten in Düngeprodukten bei
différents pH verschiedenen pH Werten
This Technical Specification (CEN/TS) was approved by CEN on 21 February 2022 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17782:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 6
5 Interferences . 6
6 Reagents . 6
7 Apparatus . 7
8 Sampling and sample preparation. 7
9 Procedure . 7
9.1 Preparation of the test sample solution . 7
9.2 Preparation of fertilizer solution in reference tap water . 8
9.3 Spectrometric determination . 8
9.4 Metal chelated content quantification . 8
10 Calculation and expression of results . 9
10.1 Mass concentration of the micronutrient (i) in the reference tap water at a specific
pH . 9
10.2 Stability of fertilizing products containing micronutrient chelates at a specific pH
................................................................................................................................................................. 9
11 Test report . 9
Bibliography . 10

European foreword
This document (CEN/TS 17782:2022) has been prepared by Technical Committee CEN/TC 260
“Fertilizers and liming materials”, the secretariat of which is held by DIN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to announce this Technical Specification: 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, Turkey
and the United Kingdom.
Introduction
Micronutrients are considered to be, in plant nutrition, a number of elements known to be needed in
small amounts for proper plant growth and development. The most common micronutrient metals are
Iron (Fe), Manganese (Mn), Cobalt (Co), Copper (Cu) and Zinc (Zn).
An EU fertilizing product consists solely of component materials complying with the requirements for
one or more of the component material categories (CMCs). CMC 1 corresponds with the virgin material
substances and mixtures.
If a micronutrient fertilizing product contains a substance, or one of the substances in the mixture,
which is intended to enhance the long-term availability to plants of micronutrients in the EU fertilizing
product, that substance is either a chelating agent or a complexing agent. The EU fertilizing products
containing chelates remain stable for at least three days in a solution having any pH within the range
declared as guaranteeing acceptable stability. Metal chelates can be used in agriculture directly to soils,
in nutrient solution in fertirrigation or soilless culture and in solution for foliar application. Tap water
is a good model for interaction with chelates since it contains calcium and magnesium that may react
chemically with the metal chelates. Composition described for CIPAC (Collaborative International
Pesticides Analytical Council) standard tap water D is a good representative of a tap water of medium
hardness and will be used in this standard to determine the stability for at least three days of
micronutrient chelates at any specific pHs.
This document defines a test method to check the chelate stability in solution, using as a model the
interaction in a reference tap water similar to the CIPAC D.
1 Scope
This document specifies a method for the determination of the soluble metal that remains in solution
at different pHs after the application of a solution of the fertilizer substance containing micronutrient
chelates in a tap water solution used as a reference.
The method applies to fertilizing products containing chelated micronutrients.
2 Normative references
The following documents are referred in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
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 16963, Fertilizers — Determination of boron, cobalt, copper, iron, manganese, molybdenum and zinc
using ICP-AES
EN 16965, Fertilizers — Determination of cobalt, copper, iron, manganese and zinc using flame atomic
absorption spectrometry (FAAS)
CEN/TS 17786-1, Inorganic micronutrient fertilizers — Determination of the chelated micronutrient
content and the chelated fraction of micronutrients — Part 1: Treatment with a cation exchange resin
CEN/TS 17786-2, Inorganic micronutrient fertilizers — Determination of the chelated micronutrient
content and the chelated fraction of micronutrients — Part 2: Determination of E
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