SIST EN 17703:2025

SLOVENSKI STANDARD
01-februar-2025
Nadomešča:
SIST-TS CEN/TS 17703:2023
Rastlinski biostimulanti - Določanje kroma Cr(VI)
Plant biostimulants - Determination of chromium(VI)
Pflanzen-Biostimulanzien - Bestimmung von Chrom(VI)
Biostimulants des végétaux - Dosage du chrome(VI)
Ta slovenski standard je istoveten z: EN 17703:2024
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17703
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2024
EUROPÄISCHE NORM
ICS 65.080 Supersedes CEN/TS 17703:2022
English Version
Plant biostimulants - Determination of chromium(VI)
Biostimulants des végétaux - Dosage du chrome(VI) Pflanzen-Biostimulanzien - Bestimmung von
Chrom(VI)
This European Standard was approved by CEN on 26 August 2024.

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17703:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 3
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Principle . 7
5 Chemicals . 7
6 Apparatus and materials . 8
7 Procedure . 9
7.1 Sampling and preparation of samples. 9
7.2 Preparation of analytical solution . 9
7.3 Chromatographic conditions . 9
7.4 Calibration . 9
7.5 Determination of the recovery rate . 10
8 Calculation and expression of results . 11
8.1 Calculation of chromium(VI) content . 11
8.2 Recovery rate (according to 7.5) . 11
8.3 Expression of results . 12
9 Test report . 12
Annex A (informative) Results of the inter-laboratory study . 13
A.1 Inter-laboratory tests . 13
A.2 Statistical results for the determination of Cr(VI) . 13
Annex B (informative) Chromatographic conditions for direct detection method . 15
B.1 General. 15
B.2 Example of ion chromatographic conditions . 15
B.2.1 Mobile phase reagents . 15
B.2.2 Instrumental conditions . 15
Annex C (informative)  Chromatographic conditions for method with post-column reaction
................................................................................................................................................................... 17
C.1 General. 17
C.2 Chromatographic system and apparatus required . 17
C.3 Example of analytical conditions . 18
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 . 21
Bibliography . 22

European foreword
This document (EN 17703:2024) has been prepared by Technical Committee CEN/TC 455 “Plant
Biostimulants”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2025, and conflicting national standards shall be
withdrawn at the latest by May 2025.
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 supersedes CEN TS 17703:2022.
In comparison with the previous edition no significant technical changes were applied in this document.
The following main editorial changes have been made:
— In the Introduction, standards used as basis for the document and the description of Annexes A, B
and C were added;
— In the Scope (Clause 1), the applicability of the document to blends was added;
— The Normative references (Clause 2) and the Bibliography were reordered. Clause 2 only contains
the references that some or all of their content constitute requirements of this document, while the
other references were included in the Bibliography;
— The principle (Clause 4) was better clarified;
— In Clause 8, the calculation and the expression of the results were aligned to EN 17704:2024 for the
dry matter expression;
— In the test report (Clause 9) further information was added;
— Annex A on the results of the inter-laboratory study was added and consequently Annex A
(Chromatographic conditions for direct detection method) and Annex B (Chromatographic
conditions for method with post-column reaction) became Annex B and C respectively;
— In Annex B and Annex C, two examples of chromatograms were added;
— Annex ZA for the relationship with EU Legislation was added;
— In the text, if references were superseded, the latest edition has been mentioned.
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.
For relationship with EU Legislation, see informative Annex ZA, which is an integral part of this document.
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 implement this European Standard: 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 the United
Kingdom.
Introduction
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 5 June 2019 [1] laying down rules on the making available on the market
of EU fertilising products (“FPR” or “Fertilising Products Regulation”).
This standardization request, presented as SR M/564 and relevant amendments, also contributes to the
Communication on “Innovating for Sustainable Growth: A Bio economy for Europe”. The interest in plant
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
commercialisation of the European biostimulant industry.
This document provides the method for the chromium VI extraction and determination as mentioned in
Annex I, Part II, PFC 6, item 2(b) of Regulation (EU) 2019/1009 [1].
Standards for determination of chromium VI in soil and waste [2] and for leather [3] were studied and
considered as a basis of this document.
This document contains two annexes (B and C) which describe two possible ways for determining
chromium VI by ion chromatography. Annex B describes an example of chromatographic conditions for
the direct detection method, while Annex C explains the chromatographic conditions for method with
post-column reaction. Both methods can be applied to determine Chromium VI. The choice depends on
the equipment available in laboratories.
The inter-laboratory study reflects the final statistical characteristics of the method for the determination
of chromium VI content in plant biostimulants. The results are given in Annex A (informative).
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.
1 Scope
This document specifies a method for verifying that hexavalent chromium (Cr(VI)) is not present in plant
biostimulants.
This document is applicable to all types of plant biostimulants (solid and liquid) used in agriculture.
The method specified is suitable to quantify the chromium(VI) content in plant biostimulants down to
2 mg/kg.
The results obtained from this method are strictly dependent on the extraction conditions. Results
obtained by using other extraction procedures (extraction solution, pH, extraction time, etc.) are not
comparable with the results produced by the procedure specified in this document.
This document is applicable to the blends of fertilizing products where a blend is a mix of at least two of
the following component EU fertilising products: Fertilizers, Liming Materials, Soil Improvers, Growing
Media, Inhibitors, Plant Biostimulants and where the following category Plant Biostimulants is the
highest percentage in the blend by mass or volume, or in the case of liquid form by dry mass. If Plant
Biostimulants is not the highest percentage in the blend, the European Standard for the highest
percentage of the blend applies. In case a blend of fertilizing products is composed of components in equal
quantity or in case the component EU fertilising products used for the blend have identical formulations ,
the user decides which standard to apply.
2 Normative reference
...