CERTIFICATION REPORT: The certification of size and shape parameters of titanium dioxide nanorods in 1-butanol solution: ERM®-FD103

Abstract

This report describes the production of ERM-FD103, which is a titanium dioxide nanorod material certified for different particle size and shape parameters as determined by electron microscopy and image analysis according to ISO 13322-1. This material was produced following ISO Guide 34:2009 and is certified in accordance with ISO Guide 35:2017. The Certified Reference Material (CRM) was produced by the Directorate F – Health, Consumers and Reference Materials of the European Commission’s Joint Research Centre (JRC) in Geel (Belgium). The CRM consists of titanium dioxide nanorods dispersed in 1-butanol. Between-unit homogeneity was quantified and stability during dispatch and storage were assessed in accordance with ISO Guide 35:2017. The minimum sample intake was determined from the results and information provided by the laboratories that participated in the interlaboratory comparison (ILC) exercise of the characterisation study. The material was characterised by an interlaboratory comparison of laboratories of demonstrated competence and adhering to ISO/IEC 17025. Technically invalid results were removed but no outlier was eliminated on statistical grounds only. Uncertainties of the certified values were calculated in accordance with the Guide to the Expression of Uncertainty in Measurement (GUM) and include uncertainties related to possible inhomogeneity, instability and characterisation. The material is intended for quality control, assessment of method performance and calibration. The CRM is available in pre-scored glass ampoules containing approximately 2 mL of suspension which were sealed under an atmosphere of argon. The minimum amount of sample to be taken from the undiluted material is 5L.JRC.F.6-Reference Material