CEN/TS 17758:2022

Fertilizers and liming materials - Determination of the chloride content by potentiometric titration

This document specifies a method for the determination of the chloride content in organic fertilizers, organo-mineral fertilizers, inorganic fertilizers and liming materials by potentiometric titration.

Düngemittel und Kalkdünger - Bestimmung des Chloridgehaltes mittels potentiometrischer Titration

Dieses Dokument legt ein Verfahren zur Bestimmung des Chloridgehalts in organischen Düngemitteln, organisch-mineralischen Düngemitteln, anorganischen Düngemitteln und Kalkdüngern mittels potentiometrischer Titration fest.

Engrais et amendements minéraux basiques - Détermination de la teneur en chlorures par titrage potentiométrique

Le présent document spécifie une méthode pour la détermination de la teneur en chlorures dans les engrais organiques, les engrais organo-minéraux, les engrais inorganiques et les amendements minéraux basiques par titrage potentiométrique.

Gnojila in sredstva za apnjenje - Določevanje klorida s potenciometrijsko titracijo

Ta dokument določa metodo za določevanje vsebnosti kloridov v organskih gnojilih, organsko-mineralnih gnojilih, anorganskih gnojilih in sredstvih za apnjenje s potenciometrijsko titracijo.

General Information

• Status: Published
• Publication Date: 05-Apr-2022
• ICS: 65.080 - Fertilizers
• Technical Committee: CEN/TC 260 - Fertilizers and liming materials
• Drafting Committee: CEN/TC 260/WG 7 - Chemical analysis
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 06-Apr-2022
• Due Date: 18-Jan-2023
• Completion Date: 06-Apr-2022
• 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: SIST-TS CEN/TS 17758:2023 - Fertilizers and liming materials - Determination of the chloride content by potentiometric titration

Overview

CEN/TS 17758:2022 - "Fertilizers and liming materials - Determination of the chloride content by potentiometric titration" specifies a laboratory method to quantify chloride in organic, organo‑mineral, inorganic fertilizers and liming materials. Approved for provisional application in April 2022, the technical specification describes sample preparation, reagents, apparatus, potentiometric titration using silver nitrate and electrode detection, calibration and reporting requirements.

Key topics and requirements

• Scope: Chloride content determination in fertilizers and liming materials by potentiometric titration.
• Principle: Chloride ions are precipitated by excess silver nitrate in an acidified medium; the equivalence point is detected potentiometrically using a silver or chloride ion‑selective electrode against a reference electrode.
• Reagents: Analytical grade chemicals; specifically nitric acid solutions, AgNO3 standard solution (c = 0.10 mol/L), polyvinyl alcohol (PVA) acidified protector, and NaCl standard/control solutions.
• Sample preparation: Typical test portion 5–10 g; dissolve/boil in water (250 ml) for ~0.5 h, dilute to 500 ml and filter if required. For very soluble chlorides, boiling may be skipped.
• Calibration and titration: Determine titre factor by titrating a NaCl standard (repeat titrations, mean volume). For samples, take aliquot containing ≤0.150 g Cl (e.g., 100 ml), acidify to pH <2 with nitric acid, add PVA protector and titrate with AgNO3. Ideal AgNO3 consumption 5–10 ml (acceptable 2–20 ml).
• Control test: Verify method with a prepared NaCl control solution (specified mass; yields 30 g/kg when using 150 ml aliquot).
• Calculation and reporting: Results expressed as percentage or g/kg chloride using the measured AgNO3 volume, titre factor and standard constants (molar mass of Cl 35.453 g/mol). Test report must identify sample, method reference (CEN/TS 17758:2022), results, sampling/analysis dates and any deviations.

Practical applications and users

• Who uses it: Analytical laboratories, fertilizer manufacturers, quality control teams, regulatory bodies, and R&D groups involved in fertilizer formulation and certification.
• Why it matters: Accurate chloride measurement helps prevent crop toxicity, ensures product compliance with labeling and regulatory limits, supports quality control of raw materials and final fertilizer blends, and aids troubleshooting of salinity issues in agronomy.
• Benefits: Potentiometric titration is precise for a wide range of fertilizer matrices, supports automation (titration systems and electrodes), and provides traceable calibration via NaCl/AgNO3 standards.

Related standards

• EN 1482-2 (sampling/sample preparation), EN 12944 (vocabulary), EN 15958 (alternative extraction), EN 16195 (chlorides without organic material), EN ISO 3696 (water for analytical use).

Keywords: CEN/TS 17758:2022, chloride determination, potentiometric titration, fertilizers, liming materials, silver nitrate titration, chloride content analysis.

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2023
Gnojila in sredstva za apnjenje - Določevanje klorida s potenciometrijsko titracijo
Fertilizers and liming materials - Determination of the chloride content by potentiometric
titration
Düngemittel und Kalkdünger - Bestimmung des Chloridgehaltes mittels
potentiometrischer Titration
Engrais et amendements minéraux basiques - Détermination de la teneur en chlorures
par titrage potentiométrique
Ta slovenski standard je istoveten z: CEN/TS 17758:2022
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17758
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
April 2022
TECHNISCHE SPEZIFIKATION
ICS 65.080
English Version
Fertilizers and liming materials - Determination of the
chloride content by potentiometric titration
Engrais et amendements minéraux basiques - Düngemittel und Kalkdünger - Bestimmung des
Détermination de la teneur en chlorures par titrage Chloridgehaltes mittels potentiometrischer Titration
potentiométrique
This Technical Specification (CEN/TS) was approved by CEN on 13 March 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 17758:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Reagents . 5
6 Apparatus and equipment . 5
7 Sampling . 6
7.1 Sampling . 6
7.2 Sample preparation . 6
8 Procedure . 6
8.1 Preparation of the test portion and the sample solution . 6
8.2 Calibration of the system (titre factor) . 6
8.3 Determination . 6
8.4 Control test . 7
9 Calculation and expression of the results . 7
10 Test report . 7
Bibliography . 8

European foreword
This document (CEN/TS 17758:2022) 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.
1 Scope
This document specifies a method for the determination of the chloride content in organic fertilizers,
organo-mineral fertilizers, inorganic fertilizers and liming materials by potentiometric titration.
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 and liming materials — Sampling and sample preparation — Part 2: Sample
preparation
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 12944-3, Fertilizers and liming materials — Vocabulary — Part 3: Terms relating to liming materials
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12944-1, EN 12944-2 and
EN 12944-3 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.o
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