Overview
ISO/TR 22293:2021 provides a structured review and evaluation of available methods to assess the release of manufactured nanomaterials (MNM) from commercial, nanomaterial-containing polymer composites. The report focuses on guiding the selection of measurement approaches that are fit for purpose to support product development, exposure assessment, and safety/risk-management decisions rather than providing step‑by‑step laboratory methods. It emphasizes realistic use scenarios and the first release pathways that could lead to human exposure or effluent release.
Key Topics
- Scope & decision context
- Problem formulation and a decision‑making framework that prioritizes feasibility and relevance to specific risk-management questions.
- Pathway analysis
- Supply‑chain and lifecycle considerations to identify when and where releases may occur (use phase, degradation, end-of-life).
- Matrix and MNM characteristics
- How polymer type, polymer degradation, MNM identity and surface chemistry, and composite structure influence rate and form of release.
- Forms of release
- Free MNM, free polymer fragments, and matrix‑bound MNM; importance of distinguishing release forms for exposure assessment.
- Measurement method selection
- Factors affecting method choice: media (air, water, solids, biological fluids), representativeness, sampling artefacts, and analytical capability.
- Sampling and sample preparation
- High‑level considerations for sampling released material into air, water, solids and biological fluids and preparing samples for analysis.
- Measurement challenges
- Surface functionalization changes, sample collection/preparation artefacts, composition measurement, and representativeness.
- Standards and research needs
- Identification of gaps: improved/new methods, inter‑laboratory studies, protocols, and decision frameworks to support standardization.
Applications and Users
ISO/TR 22293:2021 is practical for:
- Product developers and materials engineers assessing MNM selection and design trade‑offs.
- Risk managers and exposure assessors determining monitoring strategies for consumer and workplace safety.
- Analytical method and instrumentation developers seeking priority measurement needs.
- Researchers planning applied studies, inter‑laboratory comparisons, or modelling of release and exposure.
Use cases include early product design screening, developing realistic monitoring plans, and informing regulatory or corporate safety decisions for nano‑enabled polymer composites.
Related Standards
- Prepared by ISO/TC 229 (Nanotechnologies); intended to complement other ISO nanotechnology guidance and measurement standards. Users should consult related ISO/TC 229 documents and national guidance for specific test methods and conformity requirements.
Keywords: ISO/TR 22293:2021, nanomaterials release, polymer composites, measurement methods, decision-making framework, exposure assessment, nanotechnology standards.