Title: The Equivalence of Diffusive Samplers to Reference Methods for Monitoring O3, Benzene and NO2 in Ambient Air
Citation: JOURNAL OF ENVIRONMENTAL MONITORING vol. 10 p. 1052-1059
Publication Year: 2008
JRC N°: JRC43072
ISSN: 1464-0325
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC43072
DOI: 10.1039/b802260g
Type: Articles in periodicals and books
Abstract: A study of the equivalence to the reference methods of the Radiello samplers for ozone (O3) and benzene as well as the membrane-closed Palmes tube (MCPT) for nitrogen dioxide (NO2) is presented. These samplers benefit from new model equations capable of estimating their uptake rate. For O3, the aim here was to demonstrate the equivalence for the reference period of 8 hours and 120 µg m-³, the target value stated in the 3rd Daughter Directive. For benzene, the demonstration of equivalence to the annual limit value of 5 µg.m-3 as stated in the 2nd Daughter Directive was examined. In the case of NO2, the equivalence to the annual limit value as stated in the 1st Daughter Directive (40 µg m-³) was considered. Results show that the radial sampler for O3 fails to meet the Data Quality Objective (DQO) for continuous monitoring. However, with an expanded uncertainty of less than 30%, the O3 diffusive sampler fulfils the DQO for indicative measurements. For benzene, the Radiello sampler exposed for 7 days gave satisfying results showing the ability of the sampler to meet the DQO of the reference method. Nevertheless, the field tests should be complemented by measurements for a wider range of benzene concentrations. In the case of NO2, all the results of the laboratory and field experiments respected the requirements of the demonstration of equivalence. Overall, these findings thus show that the Radiello sampler and the MCPT are equivalent to the reference methods only for assessment of benzene and NO2 respectively.
JRC Institute:Energy, Transport and Climate

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