201919th International Congress of Metrology
|Nombre de pages||9|
|Section||Chemistry / Chimie|
|Publié en ligne||23 septembre 2019|
Evaluation of Homogeneity in Certified Reference Materials (CRM)
Instituto Português da Qualidade, Rua António Gião, 2, 2829-513 Caparica, Portugal
The production of Certified Reference Materials (CRM), according to the international standard ISO 17034:2016, has been playing an increasingly role in measurements and accreditation activities of entities/laboratories, with special focus on the field of chemical, biological and clinical tests and physical properties. The IPQ LGR is responsible for the production of various types of CRM, namely gas mixture standards of ethanol in nitrogen (C2H5OH/N2), by gravimetric method according to the international standard ISO 6142-1:2015, and certification by non-dispersive infrared spectroscopy (NDIR) in accordance with ISO 6143:2001. According to ISO 17034:2016, these mixtures have to be evaluated regarding the homogeneity, which is one of the fundamental requirements for the production of CRM. In this communication, the results of the homogeneity study of standards gas mixtures of ethanol in nitrogen are presented, according to a validated measurement procedure, in order to guarantee the traceability to SI units and also to meet the requirements of ISO 17034:2016. The statistical treatment of the data is presented through analysis of variance ANOVA.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.