Overview
EN ISO 21084:2019 - published by CEN/ISO - specifies a laboratory method for the determination of extractable alkylphenols (AP) in textiles and textile products without a derivatization step. The standard covers sample preparation, methanol extraction, instrumental analysis options (GC-MS, LC-MS, LC‑FLD), calibration and reporting requirements. It includes informative annexes with example chromatographic conditions and method reliability data.
Key topics and technical requirements
- Scope: Quantification of extractable octylphenols and nonylphenols from textile specimens.
- Sample preparation: Cut specimen into ~5 mm × 5 mm pieces; typical test mass 1.00 g (±0.01 g).
- Extraction: Methanol extraction (usually 10 mL, record final volume if different) with ultrasonic bath set to ~70 °C for 60 minutes; filter through a ≤0.45 µm membrane before analysis.
- Reagents: Analytical‑grade 4‑n‑octylphenol, 4‑tert‑octylphenol, 4‑n‑nonylphenol, 4‑nonylphenol, methanol (HPLC grade), acetone, acetonitrile (HPLC grade) and HPLC‑grade water.
- Apparatus: Analytical balances (0.01 g and 0.001 g resolution), 40 mL glass vials, ultrasonic water bath, syringes and membrane filters, chromatographic vials; GC capillary column ((5%‑phenyl)‑methylpolysiloxane) and C18 reverse phase for LC are recommended.
- Instrumentation: Analysis by GC‑MS, LC‑MS or LC‑FLD. Annex A/B give example GC‑MS/MS and LC‑MS/MS/FLD conditions.
- Quality & calibration: External calibration required; calibration curve should meet high linearity (correlation coefficient specified in the standard). Results in mg/L for extract are converted to mg/kg of specimen using extract volume, specimen mass and any dilution factor.
- Confirmation & caveats: Positive GC‑MS results should be confirmed by LC methods to avoid false positives (e.g., thermal decomposition of tris(nonylphenyl)phosphate).
Applications and users
- Who uses it: Textile testing laboratories, regulatory compliance labs, manufacturers, chemical risk assessors and quality control teams in textile and apparel supply chains.
- Practical uses: Screening and quantifying octylphenols/nonylphenols for compliance with chemical restrictions, supplier verification, product safety testing, and environmental/consumer protection monitoring.
- Benefits: A standardized, reproducible procedure that enables comparable AP results across laboratories and supports regulatory enforcement and product stewardship.
Related information
- Prepared by ISO/TC 38 (Textiles) in collaboration with CEN/TC 248.
- Informative annexes in the standard provide chromatographic examples and method reliability data.
- Users should observe health, safety and environmental precautions when handling solvents and standards.
Keywords: EN ISO 21084:2019, alkylphenols, AP determination, textiles, GC‑MS, LC‑MS, LC‑FLD, methanol extraction, ultrasonic extraction, octylphenol, nonylphenol, textile testing.
