Overview
ISO 22744-1:2020 specifies a standardized test method for the qualification and quantification of organotin compounds in textiles and textile products. Part 1 defines a derivatisation method using gas chromatography (GC) with mass selective detection (GC‑MS). The method extracts organotins from textile materials, converts polar/high‑boiling organotin species into volatile alkyl derivatives using sodium tetraethylborate, and determines them by GC‑MS. The standard is applicable to all types of materials of textile products (see CEN/TR 16741 for material applicability).
Key topics and technical requirements
- Extraction and complexing: Organotin substances are extracted with a methanol–ethanol mixture using tropolone as a complexing agent.
- Derivatisation reagent: Conversion to alkyl derivatives is achieved by sodium tetraethylborate (NaB(Et)4); solutions must be prepared in a fume hood and stored under inert gas (stable ≈ 3 months).
- Instrumentation: Analysis requires a gas chromatograph with a mass selective detector (GC‑MS); Annex A suggests GC‑MS conditions.
- Target compounds and internal standards: The standard lists mono‑, di‑, tri‑ and tetra‑substituted organotins and recommended internal standards. Tables and weighting factors are provided to convert organotin chlorides to organotin cation concentrations.
- Sample preparation: Test pieces should be particles with a maximum edge length of 4 mm; up to three specimens may be combined if appropriate.
- Calibration and quantification: Procedures for preparing stock and working standard solutions, calibration solutions, and calculation of mass concentration (ρ = ρCl × W) are included.
- Safety: Explicit safety warnings-sodium tetraethylborate is air‑sensitive and can spontaneously combust; organotins are toxic and endocrine disruptors.
- Quality and reporting: Requirements for blanks, expression of results, method reliability (Annex B) and test reporting are specified.
Applications and users
Who would use ISO 22744-1:2020:
- Textile laboratories performing regulatory compliance testing for organotin compounds.
- Manufacturers and chemical compliance teams verifying raw materials, coatings and finished textiles.
- Regulatory bodies and accredited testing organizations assessing consumer safety and environmental risk.
- R&D and quality control groups developing safer alternatives to organotin-based additives.
Practical uses:
- Screening and quantifying organotin residues in fabrics, coatings and polymer components.
- Supporting product compliance with chemical safety regulations and restricted substance lists.
- Providing reproducible GC‑MS methods for inter‑laboratory comparison and certification.
Related standards
- CEN/TR 16741 (materials applicability guidance)
- ISO 3696 (water for analytical use) and ISO 4787 (laboratory glassware) - normative references within ISO 22744‑1.
Keywords: ISO 22744-1:2020, organotin compounds, textiles, GC‑MS, gas chromatography, derivatisation method, sodium tetraethylborate, tropolone, analytical method, textile testing.