Title: Results of the First EC/OC Comparison Exercise for EU National Air Quality Reference Laboratories (AQUILA)
Publisher: Publications Office of the European Union
Publication Year: 2012
JRC N°: JRC68406
ISBN: 978-92-79-23085-1 (print), 978-92-79-23086-8 (PDF)
ISSN: 1018-5593 (print), 1831-9424 (online)
Other Identifiers: EUR 25213 EN
OPOCE LB-NA-25213-EN-C (print), LB-NA-25213-EN-N (PDF)
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC68406
DOI: 10.2788/97054
Type: EUR - Scientific and Technical Research Reports
Abstract: The JRC-IES European Reference Laboratory for Air Pollution (ERLAP) has organized an inter-laboratory comparison for the measurement of elemental carbon (EC) and organic carbon (OC) in particulate matter sampled on filters. To this comparison European Union National Reference Laboratories for air quality or delegated organizations have participated, all using instrumentation of the same make (Sunset Laboratories Inc. ). The objectives of this comparison have been to evaluate the performances of participants but also to study the effects of the use of different thermal analysis protocols currently used for analysis. It has been shown – based on z-scores – that all participants using laboratory analyzers are able to meet a 25% expanded uncertainty as a “fitness-for-purpose” criterion for total carbon (TC, as the sum of OC and EC) and OC. For EC this criterion is only met when results are evaluated by specific protocols (NIOSH or EUSAAR_2) separately. Field versions of the analyzer have been found for a number of samples to yield aberrant results.
JRC Directorate:Sustainable Resources

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