kSIST FprEN 17761:2026
(Main)Inorganic fertilizers - Determination of the chloride content in ammonium nitrate fertilizers of high nitrogen content
- Abstract
This document specifies a method for the determination of the chloride content in ammonium nitrate fertilizers of high nitrogen content.
This document is applicable to the fertilizing products blends where a blend is a mix of at least two of the following components: fertilizers, liming materials, soil improvers, growing media, inhibitors, plant biostimulants, and where the following category: inorganic fertilizers is the highest % in the blend by mass or volume, or in the case of liquid form by dry mass. If inorganic fertilizer is not the highest % in the blend, the European Standard for the highest % of the blend applies. In case a fertilizing product blend is composed of components in equal quantity, the user decides which standard to apply. Variations in analytical methods for fertilizing product blends can lead to differing results as some components or matrix interactions can affect the outcome. Validation procedures have shown that developed standard methods are robust and reliable across diverse product compositions, but possible interferences and unexpected results when analysing fertilizing product blends are possible.
- Status
- Not Published
- Public Enquiry End Date
- 01-May-2026
- Technical Committee
- KAT - Soil quality
- Current Stage
- 5020 - Formal vote (FV) (Adopted Project)
- Start Date
- 03-Nov-2026
- Due Date
- 22-Dec-2026
kSIST FprEN 17761:2026 is a draft European Standard from CEN for determining chloride content in ammonium nitrate fertilizers of high nitrogen content. It specifies a potentiometric titration method for chloride ions and is also intended for certain fertilizing product blends when inorganic fertilizers are the main component.
What does kSIST FprEN 17761:2026 specify?
kSIST FprEN 17761:2026 specifies a laboratory method for measuring chloride content in ammonium nitrate fertilizers of high nitrogen content. It also sets the rules for using the method on fertilizing product blends when inorganic fertilizers are the highest percentage by mass or volume, or by dry mass for liquids.
The scope matters because matrix effects can change analytical results in blends. If inorganic fertilizer is not the main component, the standard for the highest-percentage component applies; if components are present in equal quantity, the user chooses which standard to apply.
The document is organized into:
- Scope
- Normative references
- Terms and definitions
- Principle
- Reagents
- Apparatus and equipment
- Sampling and sample preparation
- Procedure
- Calculation and expression of the result
- Precision
- Test report
- Annex A with inter-laboratory study results
What are the key requirements of kSIST FprEN 17761:2026?
kSIST FprEN 17761:2026 relies on potentiometric titration of chloride ions dissolved in water with silver nitrate in an acidic medium. In practice, the method depends on detecting the titration endpoint from the electrode potential curve, so clean reagents and a stable measuring setup are important.
Sampling and sample preparation
Sampling is outside the method itself, but the document points users to EN 1482-1 for a recommended sampling method and to EN 1482-2 for sample preparation. This matters because the laboratory result is only useful if the submitted sample still represents the product and has not been altered during transport or storage.
Reagents and equipment
The method calls for analytical-grade reagents, chloride-free water, nitric acid, acetone, silver nitrate solutions, and potassium chloride solutions for standardization. The apparatus includes an analytical balance, oven, desiccator, potentiometer with silver indicating and calomel reference electrodes, a bridge with saturated potassium nitrate solution, a magnetic stirrer, and a microburette.
Standardization, blank test, and determination
Clause 8 requires standardization of the silver nitrate solution with potassium chloride solutions before sample analysis. The same clause also requires a blank test and allows it to serve as a check that the apparatus and procedure are working correctly.
For the sample determination, the standard uses a 10 g to 20 g test portion and titrates with the silver nitrate working solution in 0.1 ml additions. The note in Clause 8.4 allows automated titration if the results are equivalent, which is useful for laboratories that use automated equipment but still need comparable results.
Calculation and reporting
Clause 9 expresses the result as percentage chlorine in the fertilizer as received for analysis. The calculation uses the silver nitrate concentration, the blank correction, the equivalence volume, and the sample mass; the document also notes that % can be converted to mg/kg.
Precision and test report
Clause 10 summarizes precision from an inter-laboratory study and gives repeatability and reproducibility limits. It also notes that very low concentrations may need spiking to confirm reliability near the limit of quantification (LoQ).
Clause 11 requires the test report to identify the sample, state the method used, give the chlorine result, record sampling details if known, state when analysis finished, and list any optional steps or incidents that could have influenced the result.
What terms does kSIST FprEN 17761:2026 define?
- Potentiometric titration - a titration in which the endpoint is found by measuring electrode potential rather than by a visual color change.
- Blank test - a reagent-only determination used to correct the final result for background effects.
- Check test - the blank test also used to confirm that the apparatus and procedure are functioning correctly.
- Repeatability - the closeness of results obtained in the same laboratory under the same conditions in a short time.
- Reproducibility - the closeness of results obtained in different laboratories with different operators and equipment.
- Limit of quantification (LoQ) - the concentration region where results may need extra verification because the signal is close to the measurable limit.
- Fertilizing product blend - a mix of at least two listed components, such as fertilizers, liming materials, soil improvers, growing media, inhibitors, and plant biostimulants.
Who uses kSIST FprEN 17761:2026?
kSIST FprEN 17761:2026 is used by analytical laboratories that test fertilizer products for chloride content. It is also relevant to fertilizer manufacturers, quality control teams, and conformity assessment bodies that need a repeatable method for ammonium nitrate fertilizers and qualifying fertilizing product blends.
In practice, users apply it for product release testing, incoming inspection, batch verification, and dispute testing when chloride content needs to be measured on an as-received basis.
What changed in kSIST FprEN 17761:2026 from the previous edition?
kSIST FprEN 17761:2026 supersedes CEN/TS 17761:2022. The foreword states these significant changes:
- the CEN Technical Specification has been adopted as a European Standard
- Scope has been updated
- Normative references have been updated
- Sampling and sample preparation have been updated
- higher concentrated silver nitrate solution has been included
- automated titration has been added as an alternative
- Clause 10 on precision and Annex A with inter-laboratory study results have been added
- the Bibliography has been updated
Which standards are used with kSIST FprEN 17761:2026?
- EN 1482-2 - gives the general sample preparation provisions that Clause 7 requires.
- prEN 12944-1 - supplies general terms used in Clause 3.
- prEN 12944-2 - supplies fertilizer-related terms used in Clause 3.
- EN 1482-1 - gives the recommended sampling method mentioned in Clause 7.1.
- ISO 5725-1 - supports the precision concepts used for repeatability and reproducibility.
- ISO 5725-2 - supports the calculation approach for repeatability and reproducibility in the precision study.
What does the kSIST FprEN 17761:2026 document contain?
kSIST FprEN 17761:2026 contains the full laboratory workflow for the chloride determination, from reagent preparation through endpoint detection and result calculation. It includes the standardization procedure for silver nitrate, the blank test, the check test, and the sample titration procedure.
The document also includes a worked example for endpoint calculation in Clause 8.1 and a formula for converting titration data into chlorine content in Clause 9. Table 2 gives repeatability and reproducibility limits, and Annex A presents the results of the inter-laboratory study used to support precision claims.
Relations
- Effective Date
- 01-Dec-2026
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Frequently Asked Questions
kSIST FprEN 17761:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "Inorganic fertilizers - Determination of the chloride content in ammonium nitrate fertilizers of high nitrogen content". This standard covers: This document specifies a method for the determination of the chloride content in ammonium nitrate fertilizers of high nitrogen content. This document is applicable to the fertilizing products blends where a blend is a mix of at least two of the following components: fertilizers, liming materials, soil improvers, growing media, inhibitors, plant biostimulants, and where the following category: inorganic fertilizers is the highest % in the blend by mass or volume, or in the case of liquid form by dry mass. If inorganic fertilizer is not the highest % in the blend, the European Standard for the highest % of the blend applies. In case a fertilizing product blend is composed of components in equal quantity, the user decides which standard to apply. Variations in analytical methods for fertilizing product blends can lead to differing results as some components or matrix interactions can affect the outcome. Validation procedures have shown that developed standard methods are robust and reliable across diverse product compositions, but possible interferences and unexpected results when analysing fertilizing product blends are possible.
This document specifies a method for the determination of the chloride content in ammonium nitrate fertilizers of high nitrogen content. This document is applicable to the fertilizing products blends where a blend is a mix of at least two of the following components: fertilizers, liming materials, soil improvers, growing media, inhibitors, plant biostimulants, and where the following category: inorganic fertilizers is the highest % in the blend by mass or volume, or in the case of liquid form by dry mass. If inorganic fertilizer is not the highest % in the blend, the European Standard for the highest % of the blend applies. In case a fertilizing product blend is composed of components in equal quantity, the user decides which standard to apply. Variations in analytical methods for fertilizing product blends can lead to differing results as some components or matrix interactions can affect the outcome. Validation procedures have shown that developed standard methods are robust and reliable across diverse product compositions, but possible interferences and unexpected results when analysing fertilizing product blends are possible.
kSIST FprEN 17761:2026 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.
kSIST FprEN 17761:2026 has the following relationships with other standards: It is inter standard links to SIST-TS CEN/TS 17761:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
kSIST FprEN 17761:2026 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.
kSIST FprEN 17761:2026 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
oSIST prEN 17761:2026
01-april-2026
Anorganska gnojila - Določanje klorida v gnojilih iz amonijevega nitrata z veliko
vsebnostjo dušika
Inorganic fertilizers - Determination of the chloride content in ammonium nitrate fertilizers
of high nitrogen content
Anorganische Düngemittel - Bestimmung des Chloridgehaltes in
Ammoniumnitratdüngemitteln mit hohem Stickstoffgehalt
Engrais inorganiques - Détermination de la teneur en chlorure des engrais à base de
nitrate d'ammonium à forte teneur en azote
Ta slovenski standard je istoveten z: prEN 17761
ICS:
65.080 Gnojila Fertilizers
oSIST prEN 17761:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 17761:2026
oSIST prEN 17761:2026
DRAFT
EUROPEAN STANDARD
prEN 17761
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2026
ICS 65.080 Will supersede CEN/TS 17761:2022
English Version
Inorganic fertilizers - Determination of the chloride
content in ammonium nitrate fertilizers of high nitrogen
content
Engrais inorganiques - Détermination de la teneur en Anorganische Düngemittel - Bestimmung des
chlorure des engrais à base de nitrate d'ammonium à Chloridgehaltes in Ammoniumnitratdüngemitteln mit
forte teneur en azote hohem Stickstoffgehalt
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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17761:2026 E
worldwide for CEN national Members.
oSIST prEN 17761:2026
prEN 17761:2026 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Reagents . 4
6 Apparatus and equipment . 5
7 Sampling and sample preparation . 5
7.1 Sampling . 5
7.2 Sample Preparation . 5
8 Procedure . 6
8.1 Standardization of the silver nitrate solution . 6
8.2 Blank test . 6
8.3 Check test . 7
8.4 Determination . 7
9 Calculation and expression of the result . 7
10 Precision . 8
10.1 Inter-laboratory study . 8
10.2 Repeatability . 8
10.3 Reproducibility . 8
11 Test report . 9
Annex A (informative) Results of the inter-laboratory study . 10
A.1 Inter-laboratory study . 10
A.2 Statistical results . 10
Bibliography . 12
oSIST prEN 17761:2026
prEN 17761:2026 (E)
European foreword
This document (prEN 17761:2026) 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 the CEN Enquiry.
This document will supersede CEN/TS 17761:2022.
prEN 17761:2026 includes the following significant technical changes with respect to
CEN/TS 17761:2022:
a) the CEN Technical Specification has been adopted as a European Standard;
b) update of Scope (Clause 1);
c) update of Normative references (Clause 2);
d) Sampling and sample preparation (Clause 7) has been updated;
e) the use of higher concentrated silver nitrate solution has been included;
f) the use of automated titration has been added as alternative;
g) Clause 10 (Precision) and Annex A including results of inter-laboratory study added;
h) update of Bibliography.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
oSIST prEN 17761:2026
prEN 17761:2026 (E)
1 Scope
This document specifies a method for the determination of the chloride content in ammonium nitrate
fertilizers of high nitrogen content.
This document is applicable to the fertilizing products blends where a blend is a mix of at least two of the
following components: fertilizers, liming materials, soil improvers, growing media, inhibitors, plant
biostimulants, and where the following category: inorganic fertilizers is the highest % in the blend by
mass or volume, or in the case of liquid form by dry mass. If inorganic fertilizer is not the highest % in the
blend, the European Standard for the highest % of the blend applies. In case a fertilizing product blend is
composed of components in equal quantity, the user decides which standard to apply. Variations in
analytical methods for fertilizing product blends can lead to differing results as some components or
matrix interactions can affect the outcome. Validation procedures have shown that developed standard
methods are robust and reliable across diverse product compositions, but possible interferences and
unexpected results when analysing fertilizing product blends are possible.
2 Normative references
The following documents are referred to 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 1482-2, Fertilizers, liming materials and inhibitors — Sampling and sample preparation — Part 2:
General sample preparation provisions
prEN 12944-1, Fertilizers, liming materials and inhibitors — Vocabulary — Part 1: General terms
prEN 12944-2, Fertilizers, liming materials and inhibitors — Vocabulary — Part 2: Terms relating to
fertilizers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in prEN 12944-1 and prEN 12944-2
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Principle
Chloride ions dissolved in water are determined by potentiometric titration with silver nitrate in an acidic
medium.
5 Reagents
Use only reagents of recognized analytical grade, unless otherwise specified.
5.1 Distilled or demineralized water, free from chloride ions.
5.2 Acetone, analytical grade.
5.3 Concentrated nitric acid, density ρ = 1,40 g/ml, at 20 °C.
oSIST prEN 17761:2026
prEN 17761:2026 (E)
5.4 Silver nitrate stock solution, substance concentration c = 0,100 mol/l.
Store this solution in a brown glass bottle. A commercially available standard solution of at least
0,100 mol/l may be used.
5.5 Silver nitrate solution, c = 0,004 mol/l.
Prepare this solution at the time of use.
5.6 Potassium chloride (KCl), analytical grade.
5.7 Potassium chloride (KCl) stock solution, c = 0,100 mol/l.
Weigh, to the nearest 0,1 mg, 3,727 6 g of potassium chloride (5.6), previously dried for one hour in an
oven (6.2) at 130 °C and cooled in a desiccator (6.3) to ambient temperature. Add sufficient water (5.1)
in order to dissolve the potassium chloride. Transfer the solution
...