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NIA Meeting Report on the 25th MEETING OF THE WORKING PARTY ON MANUFACTURED NANOMATERIALS (OECD)
MXenes are emerging as a major regulatory blind spot, with critical data gaps on pulmonary toxicity, genotoxicity, and environmental fate, and serious questions about whether existing test methods can handle their unique properties at all.The long-awaited OECD guidance on sample preparation and dosimetry for nanomaterial safety testing has been approved for release, updating a framework last revised in 2012.3D printing is now on the OECD's radar as a nanomaterial exposure concern, with emissions of VOCs, particulates, and free radicals flagged as particular risks in consumer and educational settings.A new ring trial planned for 2026 will test whether a standardized bioaccumulation protocol for nanomaterials can hold up across multiple laboratories, a prerequisite for any future OECD test guideline.Six consumer exposure models have been put through practical case studies, revealing significant usability gaps and highlighting that no single tool works across all nanomaterial scenarios.
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