Title: Fifth EC-JRC aromatic compounds inter-laboratory comparison with automatic analysers
Publisher: Publications Office of the European Union
Publication Year: 2020
JRC N°: JRC120572
ISBN: 978-92-76-19198-8 (online),978-92-76-19199-5 (print)
ISSN: 1831-9424 (online),1018-5593 (print)
Other Identifiers: EUR 30239 EN
OP KJ-NA-30239-EN-N (online),KJ-NA-30239-EN-C (print)
URI: https://publications.jrc.ec.europa.eu/repository/handle/JRC120572
DOI: 10.2760/70810
Type: EUR - Scientific and Technical Research Reports
Abstract: This report presents the results of the fifth inter-laboratory comparison for BTEX automatic analysers performed at the JRC Ispra from the 23rd to the 26th of September 2019. Thirteen national reference laboratories with fifteen instruments participated in this exercise. Six concentration levels were tested during the inter-laboratory comparison. Benzene concentrations ranged from 1 to 20 μg/m3. The exercise was evaluated according to ISO 13528 methodologies for the evaluation of inter-laboratory proficiency assessment and the recommendation of the protocol N37 of the AQUILA network. Participating laboratories are identified as requested by the afore-mentioned protocol. The robust average value calculated according to ISO13528 was adopted as reference value for the exercise. The report provides information on the technique and instrumentation used by each participant and shows the results of linearity tests, identification of outliers, repeatability, reproducibility and robustness of the method. Furthermore, parameters to evaluate individual laboratory results: repeatability score, Z-score, bias and En scores are also provided. In general, the results showed in terms of accuracy and precision a behaviour similar to the previous inter-laboratory exercise (EUR-28692-EN). The decrease in concentration avoided problems of sample’s overload at the highest concentrations, i.e. toluene. For benzene and toluene, average repeatability and reproducibility values were about 6 % and 13 %, respectively. Ethyl-benzene, m,p-xylene and o-xylene showed higher repeatability values of around 9 %, while their values of reproducibility were about 20 %.
JRC Directorate:Energy, Transport and Climate

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