FprEN 17723

SLOVENSKI STANDARD
oSIST prEN 17723:2023
01-marec-2023
Rastlinski biostimulanti - Določevanje klorida
Plant biostimulants - Determination of chloride
Pflanzen-Biostimulanzien - Chloridbestimmung
Biostimulants des végétaux - Dosage des chlorures
Ta slovenski standard je istoveten z: prEN 17723
ICS:
65.080 Gnojila Fertilizers
oSIST prEN 17723:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 17723:2023
oSIST prEN 17723:2023
DRAFT
EUROPEAN STANDARD
prEN 17723
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2023
ICS Will supersede
English Version
Plant biostimulants - Determination of chloride
Biostimulants des végétaux - Dosage des chlorures Pflanzen-Biostimulanzien - Chloridbestimmung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 455.
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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17723:2023 E
worldwide for CEN national Members.

oSIST prEN 17723:2023
prEN 17723:2023 (E)
Contents
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Sampling . 5
5 Principle . 6
5.1 General. 6
5.2 Interferences . 6
6 Reagents . 6
6.1 Water . 6
6.2 Nitric acid solution . 6
6.3 Silver nitrate standard solution, c = 0,1 mol/l solution . 6
7 Apparatus . 6
8 Procedure . 7
8.1 Measurement temperature . 7
8.2 Preparation of the test portion . 7
8.3 Blank test . 7
8.4 Titration . 7
8.5 Recovery test . 7
9 Expression of results . 8
10 Precision . 9
11 Test report . 9
Annex A (informative) Preparation and standardization of 0,1 mol/l silver nitrate solution
................................................................................................................................................................... 10
Annex B (informative) More exact calculation of the equivalence point of the titration . 11
Annex C (informative) Repeatability and Reproducibility data . 12
C.1 Materials used in the interlaboratory study . 12
C.2 Samples . 12
C.3 Procedure . 12
C.4 Replicate determination . 12
C.5 Results . 12
Annex ZA (informative) Relationship of this European Standard and the essential
requirements of Regulation (EU) 2019/1009 making available on the market of EU
fertilising products aimed to be covered . 15
Bibliography . 16

oSIST prEN 17723:2023
prEN 17723:2023 (E)
European foreword
This document (prEN 17723:2023) has been prepared by Technical Committee CEN/TC 455 “Plant
Biostimulants”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN enquiry.
This document will supersede CEN/TS 17723:2022.
This document has been prepared under a Standardization Request given to CENELEC by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
oSIST prEN 17723:2023
prEN 17723:2023 (E)
Introduction
This document was prepared by the experts of CEN/TC 455 “Plant Biostimulants”. The European
Committee for Standardization (CEN) was requested by the European Commission (EC) to draft
European standards or European standardization deliverables to support the implementation of
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 (“FPR” or “Fertilising Products
Regulation”). This standardization request, presented as M/564 and M/564/Amd1, also contributes to
the Communication on “Innovating for Sustainable Growth: A Bio economy for Europe”. Working Group
5 “Labelling and denominations”, was created to develop a work program as part of this standardization
request.
Technical Committee CEN/TC 455 “Plant Biostimulants” was established to carry out the work program
that will prepare a series of standards. The interest in biostimulants has increased significantly in Europe
as a valuable tool to use in agriculture. Standardization was identified as having an important role in
order to promote the use of biostimulants. The work of CEN/TC 455 seeks to improve the reliability of
the supply chain, thereby improving the confidence of farmers, industry, and consumers in biostimulants,
and will promote and support commercialization of the European biostimulant industry.
To improve the market of EU Plant Biostimulants products, they should be labelled in accordance with
the labelling requirements set out in Annex III of Regulation 2019/1009 [5], which prescribes that the
−
phrase “poor in chloride” or similar may only be used if the chloride (Cl ) content is below 30 g/kg of dry
matter.
This means that the manufacturer has the possibility to note on the label that the plant biostimulant is
“poor in chloride”, only if the manufacturer has done the analysis and the chloride content is well below
30 g/kg of dry matter.
The trend of the last few years is to reduce the use of harmful chemicals both for operators and the
environment, favouring the use of the most advanced technologies that have a lower impact; therefore,
the potentiometric is preferable to other techniques.
Furthermore, the potentiometric method is not influenced by interferences due to colour or turbidity of
the sample solution.
WARNING — Persons using this document should be familiar with usual laboratory practice. This
document does not purport to address all of the safety issues, if any, associated with its use. It is the
responsibility of the user to establish appropriate health and safety practices and to ensure compliance
with any national regulatory conditions.
IMPORTANT — It is absolutely essential that tests conducted according to this document are carried out
by suitably trained staff.
oSIST prEN 17723:2023
prEN 17723:2023 (E)
1 Scope
-
This document specifies a potentiometric method for the determination of chloride (Cl ) content in the
presence or in the absence of organic material. This method is applicable to plant biostimulants.
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.
prEN 17702-2:—, Plant biostimulants - Sampling and sample preparation - Part 2: Sample preparation
prEN 17724:—, Plant biostimulants - Terminology
EN ISO 3696:1995, Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in prEN 17724:— and the following
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
3.1
chloride content of plant biostimulants
mass fraction of chlorides, expressed in g/kg of dry matter, determined in accordance with the procedure
described in this document
4 Sampling
Sampling is not part of this method specified in this document. A recommended sampling method is given
in prEN 17702-1:— .
Laboratory sample preparation shall be carried out in accordance with EN 17702-2:— . Homogeneous
samples are recommended.
Under preparation
Under preparation
Under preparation
oSIST prEN 17723:2023
prEN 17723:2023 (E)
5 Principle
5.1 General
Soluble chlorides are extracted from the sample with water containing nitric acid. The chloride content
of the solution is titrated with silver nitrate standard solution and the end point is determined
potentiometrically by using either a silver ion selective electrode plus a reference electrode or a
combined electrode.
5.2 Interferences
-
Maintain the sample at a lower pH can avoid the silver ion interact with OH to form silver oxide (Ag O)
precipitation, minimize other anionic ions interference with the AgCl formation, and improve the binding
between the titrant and the analyte.
6 Reagents
Use only reagents of recognized analytical grade.
6.1 Water
Water free from chlorides in compliance with quality grade 2, according to EN ISO 3696:1995 shall be
used.
6.2 Nitric acid solution
Nitric acid solution: dilute 1:1 concentrated nitric acid (70 %) with water (6.1).
6.3 Silver nitrate standard solution, c = 0,1 mol/l solution
Silver nitrate solution, 0,1 mol/l in water (6.1). Use commercially available silver nitrate solution with
certified concentration or prepare and standardize a solution according to the instructions in Annex A.
7 Appa
...