prEN 18388

SLOVENSKI STANDARD
01-september-2026
Inhibitorji - Določanje klorida z ionsko kromatografijo in detekcijo na osnovi
prevodnosti (IC-CD)
Inhibitors - Determination of the chloride content by ion chromatography and conductivity
detection (IC-CD)
Hemmstoffe - Bestimmung des Chloridgehalts mittels Ionenchromatographie und
Leitfähigkeitsnachweis (IC-CD)
Ta slovenski standard je istoveten z: prEN 18388
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2026
ICS
English Version
Inhibitors - Determination of the chloride content by ion
chromatography and conductivity detection (IC-CD)
Hemmstoffe - Bestimmung des Chloridgehalts mittels
Ionenchromatographie und Leitfähigkeitsnachweis (IC-
CD)
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 18388:2026 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 . 4
6 Apparatus and equipment . 5
7 Sampling and sample preparation . 5
7.1 General. 5
7.2 Chromatographic conditions . 5
7.3 Preparation of the calibration solutions calibration . 6
7.4 Preparation of the test solution and determination . 6
7.5 Quality control sample . 7
8 Calculation and expression of the results . 7
9 Environmental aspects . 7
10 Precision . 7
10.1 Quality assurance . 7
10.2 Inter-laboratory study . 7
10.3 Repeatability . 7
10.4 Reproducibility . 8
11 Test report . 8
Annex A (informative) Results of the inter-laboratory test. 9
A.1 Inter-laboratory study . 9
A.2 Statistical results for the determination of the chloride content by IC-CD . 10
Bibliography . 11

European foreword
This document (prEN 18388:2026) 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 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.
1 Scope
This document specifies a method for the determination of the chloride content in inhibitors by ion
chromatography.
This document is applicable to inhibitors and inhibiting compounds including mixtures of inhibitors and
inhibiting compounds.
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
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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12944-1 and EN 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
The inhibitor sample is diluted in water. The content of chloride is determined in diluted aqueous solution
by ion chromatography using a conductivity detector (IC-CD).
5 Reagents
All reagents shall be of recognized analytical grade and shall have negligible concentration of the element
to be determined if compared to the lowest concentration of that element in the sample solution.
5.1 Water, distilled or demineralized.
The electrical conductivity shall be < 0,2 mS/m (at 25 °C).
−
) = 1 000 mg/l.
5.2 Chloride standard solution, mass concentration γ(Cl
−
5.3 Quality control sample chloride, γ(Cl ) = 1,0 mg/l prepared from a certified solution or a certified
solid standard substance.
5.4 Eluent for IC-CD, as advised by the manufacturer to be used for determining chloride.
The eluent advised by the manufacturer of the instrument depends on the instrument
...