SIST EN ISO 11936:2023 PDF

Overview

EN ISO 11936:2023 - Leather: Determination of total content of certain bisphenols specifies an analytical method to measure the total solvent-extractible content of four bisphenols in leather: bisphenol A, B, F and S. Published by CEN and aligned with ISO/IULTCS guidance, the method uses methanol extraction (ultrasonic bath) and liquid chromatography (LC) with detection by LC‑MS/MS, LC‑MS, LC‑UV, LC‑DAD or LC‑FLD. The procedure can be extended to other bisphenols after laboratory validation.

Key topics and technical requirements

• Scope: Quantification of solvent‑extractible bisphenol A, B, F and S in leather samples; method applicable to other bisphenols if validated.
• Extraction principle: Ultrasonic extraction in methanol at (60 ± 5) °C; aliquots can be analysed directly without additional cleanup.
• Instrumentation: Liquid chromatography coupled with one of:
  • Single quadrupole MS (LC‑MS)
  • Triple quadrupole MS/MS (LC‑MS/MS)
  • UV detector (LC‑UV)
  • Diode array detector (LC‑DAD)
  • Fluorescence detector (LC‑FLD)
• Calibration and internal standards: Multi‑level calibration (examples given from 20 µg/l to 1000 µg/l). Use of mass-labelled internal standards (e.g., BPA‑D8, BPA‑D16, BPF‑D10, BPS‑D8) is recommended for LC‑MS(/MS) to reduce matrix effects.
• Apparatus & reagents: Ultrasonic bath with temperature control, syringe filters (0.2 µm), LC vials and LC‑grade methanol; water grade per ISO 3696.
• Documentation: Method includes procedures for sample preparation, calculation (with/without internal standard), precision data and reporting requirements. Informative annexes give example LC operating parameters and method precision (Annexes A–D).

Practical applications

• Quality control in leather manufacturing to monitor residual monomers/impurities from tanning agents.
• Laboratory testing for product safety and chemical content analysis using standardized LC methods.
• Regulatory and conformity testing where measurement of bisphenols in consumer articles or industrial leather products is required.
• Research and troubleshooting to identify sources of bisphenol contamination (e.g., impurity in synthetic tanning agents).

Who should use this standard

• Accredited testing laboratories performing chemical analyses on leather.
• Leather manufacturers and tanneries implementing in‑house QC for chemical residues.
• Product safety professionals and regulators assessing chemical content in leather goods.
• Environmental and toxicology labs concerned with endocrine‑active substances in materials.

Related standards

• ISO 2418 - Position and preparation of leather specimens
• ISO 4044 - Preparation of chemical test samples (leather)
• ISO 3696 - Water for analytical laboratory use

Keywords: EN ISO 11936:2023, leather testing, bisphenol A, bisphenol B, bisphenol F, bisphenol S, LC‑MS/MS, LC‑UV, solvent extraction, leather quality control, CEN, IULTCS.