The Organization for Economic Cooperation and Development (OECD) has published the latest edition of the Developments in Delegations on the Safety of Manufactured Nanomaterials Tour de Table. The Tour de Table compiles information provided by delegations on developments concerning the safety of manufactured nanomaterials. It includes the following information on developments in the United States.
The U.S. Environmental Protection Agency (EPA) completed review of two low volume exemptions for a modified graphene substance and a modified titanium dioxide substance. According to the Tour de Table, EPA allowed the exemptions under conditions that limited human and environmental exposures to prevent unreasonable risks. Additionally, EPA reviewed and completed a significant new use notice (SNUN) for a carbon nanotube substance. EPA regulated the new chemical substance with a consent order owing to limited available data on nanomaterials; the consent order limited uses and human and environmental exposure to prevent unreasonable risks.
The National Institute for Occupational Safety and Health (NIOSH) assessed potential health risk from occupational exposure to silver nanomaterials and derived a recommended exposure limit (REL) for silver nanomaterials (less than 100 nanometers (nm) primary particle size) of 0.9 micrograms per cubic meter (?g/m3) as an airborne respirable eight-hour time-weighted average (TWA) concentration. NIOSH published the assessment in May 2021. More information is available in our May 20, 2021, blog item.
Between September 2020 and May 2021, EPA received notification of one nanoscale substance that met reporting criteria pursuant to its authority under Section 8(a) of the Toxic Substances Control Act (TSCA), bringing the total number of notifications to 78. Reporting criteria exempted nanoscale chemical substances already reported as new chemicals under TSCA and nanoscale chemical substances that do not have unique or novel properties. According to the Tour de Table, most reporting was for metals or metal oxides.
Nano and Other Emerging Chemical Technologies Blog, 26 January 2022