Title: CERTIFICATION REPORT: The certification of equivalent diameters of silica nanoparticles in aqueous solution: ERM®-FD101b
Publisher: Publications Office of the European Union
Publication Year: 2017
JRC N°: JRC105046
ISBN: 978-92-79-64637-9
ISSN: 1831-9424
Other Identifiers: EUR 28362 EN
OP LA-NA-28362-EN-N
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC105046
DOI: 10.2787/212519
Type: EUR - Scientific and Technical Research Reports
Abstract: This report describes the production of ERM®-FD101b, silica nanoparticles suspended in an aqueous solution, certified for different equivalent particle diameters. The material was produced following ISO Guide 34:2009. 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 was produced from a diluted and pH adjusted commercial colloidal silica slurry. Between unit-homogeneity was quantified and stability during dispatch and storage were assessed in accordance with ISO Guide 35:2006. The minimum sample intake for the different methods was determined from the results and information provided by the laboratories that participated in the interlaboratory comparison (ILC) exercises of the characterisation study. The material was characterised for several equivalent particle diameters based on an interlaboratory comparison amongst 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 uncertainty contributions related to possible inhomogeneity and instability and to characterisation. The material is intended for quality control and assessment of method performance. The method-defined certified values are regarded as reliable estimates of the true values and ERM-FD101b can therefore be used for calibration purposes. The CRM is available in 10 mL pre-scored amber glass ampoules each containing about 9 mL of suspension. The CRM was accepted as European Reference Material (ERM®) after peer evaluation by the partners of the European Reference Materials consortium.
JRC Directorate:Health, Consumers and Reference Materials

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