The European Commission’s (EC) Joint Research Centre (JRC) has today published a new Science and Policy Report, Cerium Dioxide, NM-211, NM-212, NM-213. Characterisation and test item preparation. The report ‘presents the physico-chemical characterisation of Representative Test Materials (RTMs) of manufactured nano cerium dioxide’, with the aim that they ‘may be used as representative material[s] in the measurement and testing with regard to hazard identification, risk and exposure assessment studies’.
RTMs are nanomaterials available from a single production batch, and ‘enhance the comparability of results between different research laboratories and projects’. They are available to the international scientific community so as to ‘enhance and enable development of safe materials and products’. The Organisation for Economic Co-operation and Development’s (OECD) Working Party on Manufactured Nanomaterials (WPMN) led a programme that tested these RTMs; cerium dioxide NM-211, NM-212 and NM-213 were characterised by the NIA’s PPP project, PROSPEcT, which also characterised zinc oxide RTMs.
According to the report, ‘many of the OECD endpoints on physico-chemical testing have been completed’ by the work – ‘the results for 15 physico-chemical endpoints are addressed in the present report, including size and size distribution, crystallite size and electron microscopy images, zeta potential and dispersibility, and sample and test item preparation procedures’.