ISO/FDIS 20999

ISO/DISFDIS 20999
ISO/TC 38
Secretariat: JISCSAC
Date: 2025-12-032026-01-14
Textiles — Determination of total halogens fromin textile products —
Method using combustionCombustion and ion chromatography (C-IC)
test method
Textiles — Détermination des halogènes totaux présents dans les produits textiles — Méthode par combustion
et chromatographie ionique (C-CI)
DISFDIS stage
Warning for WD’s and CD’s
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ISO/DISFDIS 20999:20252026(en)
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iii
ISO/DISFDIS 20999:20252026(en)
Contents
Foreword . v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents and materials . 1
5.2 Halide salts . 2
5.3 Standard solutions . 2
5.4 Eluent . 3
5.5 Absorption solution . 3
5.6 Oxygen . 3
6 Apparatus . 3
7 Preparation of test specimen . 4
8 Procedure . 4
8.1 Combustion by separate combustion device . 4
8.2 Determination by separate ion chromatograph (IC) . 4
8.3 Determination by combustion device coupled to an ion chromatograph (C-IC) . 4
9 Expression of results . 5
9.1 Calculation . 5
9.2 Limit of quantification (LOQ) . 5
9.3 Reliability of the test method . 5
10 Test report . 5
Annex A (informative) Combustion device . 6
Annex B (informative) Ion chromatographic analysis . 9
Annex C (informative) Reliability of method . 12

iv
ISO/DISFDIS 20999:20252026(en)
Foreword
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This document was prepared by Technical Committee TC 38, Textiles, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 248, Textiles and textile products, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
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v
ISO/DISFDIS 20999:20252026(en)
Introduction
The determination of the total content of various halogens can be used as a screening method for harmful
substances whose constituents include one or more of these halogens. For example, the fluorine content of a
textile can indicate that it contains legally restricted perfluorinated and polyfluorinated alkyl substances
(PFAS) or organic fluorine. High chlorine and bromine concentrations can indicate the presence of flame
retardants or biocides in the textile. It should be noted that the test method is not able to distinguish between
organically and inorganically bound halogens. It can also not distinguish between PFAS which are
characterised by at least one fully fluorinated methyl (-CF ) or methylene (-CF -) carbon atoms and fluorinated
3 2
alkyl substances which do comply with this specification.
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ISO/DISFDIS 20999:20252026(en)
Textiles — Determination of total halogens fromin textile products —
Method using combustionCombustion and ion chromatography (C-IC)
test method
1 Scope
This document specifies a test method for the determination of total amount of halogens (including fluorine,
chlorine, bromine and iodine) present in textile products by combustion and ion chromatography (C-IC).
This document is applicable to all materials of textile productswhichproducts which are combustible, e.g.
fibres, fabrics, plastic components (including coating), wood.
WARNING — If the textile products are made of halogenated fibres, the high amount of halogens can
contaminate the combustion and IC system.
2 Normative references
There are no normative references in this document.
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.
ISO 3696, Water for analytical laboratory use — Specification and test methods
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Principle
The test specimen is placed into a sample boat, and introduced into a combustion tube to be combusted at a
high temperature under a stream of oxygen and water vapour (pyrohydrolysis). The emerged hydrogen halide
gases are carried away with the gas stream, cooled and collected in an absorption solution. The concentrations
of the different halogens in the absorption solution are determined by ion chromatography (IC).
5 Reagents and materials
Unless otherwise specified, analytical grade chemicals shall be used.
5.1 Water, Grade 1 water as specified in ISO 3696.
ISO/DISFDIS 20999:20252026(en)
5.2 Halide salts
® ® ®1)
5.2.1 Sodium fluoride (NaF), CAS Registry Number (CAS RN ) 7681-49-4. ®
5.2.2 Sodium chloride (NaCl), CAS RN 7647-14-5. ®
5.2.3 Potassium bromide (KBr), CAS RN 7758-02-3. ®
5.2.4 Potassium iodide (KI), CAS RN 7681-11-0.
5.3 Standard solutions
5.3.1 General
The laboratory shall decide which halogens need to be determined. Based on this decision, the required
standard solutions shall be prepared.
Commercially available certified reference materials can be used.
5.3.2 Standard stock solutions
Prepare standard stock solutions of fluorine, chlorine, bromine or iodine with an appropriate concentration
(e.g. c=1 000 mg/l) by dissolving the halide salts (5.2(5.2)) in water (5.1(5.1).). An example for preparing the
standard stock solutions is given in 0Table 1.
It is recommended that the standard stock solution of fluorine should be stored in polypropylene or high-
density polyethylene container. The standard stock solutions of fluorine, chlorine, bromine or iodine should
be stored in a brown bottle at 0 °C to 4 °C for 6 months.
Table 1 — Example for preparing standard stock solutions of halogens
Standard stock Halide salts Mass Final volume Solvent
sol
...