PMID: 11317708Apr 25, 2001Paper

Further round-robin tests to improve the comparability between laboratories of the measurement of carbon in diesel soot and in environmental samples

International Archives of Occupational and Environmental Health
M GuilleminR Hebisch

Abstract

An informal European coordination group organized two round-robin tests on filters collected from environmental, workplace and diluted diesel emissions. Previous inter-laboratory comparisons have shown that experimental samples give reasonably good results in terms of the dispersion around the mean, from all the participating laboratories. However, there were significant differences between the laboratories owing to a narrow distribution of the results within a single laboratory. In order to gain a better understanding of the differences obtained between the laboratories, it was decided to carry out more round-robin tests and to investigate further the possible factors which may influence the results. The first round-robin (RRT3) was performed on six different samples (eight replicates) analyzed by ten laboratories. The range of loading was 40 to 138 micrograms cm-2 of total carbon (TC). Laboratories used their own thermal procedure parameters. The second round-robin test (RRT4) was performed on three different diluted diesel emissions (two replicates) samples analyzed by 13 laboratories. The range of loading was 21 to 37 micrograms cm-2 TC. Laboratories analyzed samples using imposed temperatures (500, 650 and 800 degrees C) a...Continue Reading

Citations

Nov 7, 2003·Journal of Exposure Analysis and Environmental Epidemiology·James J Schauer

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