Community Research and Development Information Service - CORDIS

Abstract

This study presents a trial of intercomparison tests for air-quality monitoring institutes using diffusion samplers to measure the level of nitrogen dioxide in France. Data evaluation shows that the participants obtained good results using the samplers on their sites. With tests on doped tubes and reference materials, around half the participants obtained good results, although the set objective was also more ambitious. Intercomparison was also planned to determine the repeatability and reproducibility of the measuring method. With tests on site, repeatability diminishes with the level of measured concentration, moving from around 20% to 10% when concentrations increase from 15 to 40 milligrams per cubic metre. On the other hand, reproducibility appears stable at around 45%. With tests on doped tubes and reference materials, repeatability (10%) and reproducibility (20%) levels are lower.

The reproducibility level is always higher than repeatability, which suggests systematic errors in the preparation and/or analysis. Furthermore, quality control reveals that the white value, linearity deviation and variation in the calibration slope can be reduced.

Overall, the results of this study seem more precise than those obtained using WASP quality control and the UK's national nitrogen dioxide network, or the 1999 intercomparison carried out by the Douai Mining School.

In particular, the median of the average values of all laboratories conducting tests on site completely matches the measurements obtained by analysers using chemiluminescence. Moreover, the new reference materials, prepared by ERLAP by exposure in a controlled atmosphere, have proved worthy of use in this type of intercomparison.

Additional information

Authors: GERBOLES M, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);BUZICA D, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);AMANTINI L, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT)
Bibliographic Reference: EUR 20744 FR (2003), pp.29. Euro: Free of charge.
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9843 or +39 033278 9864 Fax: +39 033278 9623 E-mail: jrc-publications-office@ec.europa.eu
Record Number: 200316597 / Last updated on: 2003-09-05
Category: PUBLICATION
Original language: fr
Available languages: fr