| Title: | Inter-laboratory comparison study on measuring semi-volatile organic chemicals in standards and air samples |
| Address: | "Air Quality Research Division, Science and Technology Branch, Environment Canada, Toronto, Ontario, Canada. yushan.su@ec.gc.ca" |
| DOI: | 10.1016/j.envpol.2010.07.041 |
| ISSN/ISBN: | 1873-6424 (Electronic) 0269-7491 (Linking) |
| Abstract: | "Measurements of semi-volatile organic chemicals (SVOCs) were compared among 21 laboratories from 7 countries through the analysis of standards, a blind sample, an air extract, and an atmospheric dust sample. Measurement accuracy strongly depended on analytes, laboratories, and types of standards and samples. Intra-laboratory precision was generally good with relative standard deviations (RSDs) of triplicate injections <10% and with median differences of duplicate samples between 2.1 and 22%. Inter-laboratory variability, measured by RSDs of all measurements, was in the range of 2.8-58% in analyzing standards, and 6.9-190% in analyzing blind sample and air extract. Inter-laboratory precision was poorer when samples were subject to cleanup processes, or when SVOCs were quantified at low concentrations. In general, inter-laboratory differences up to a factor of 2 can be expected to analyze atmospheric SVOCs. When comparing air measurements from different laboratories, caution should be exercised if the data variability is less than the inter-laboratory differences" |
| Keywords: | "Air Pollutants/*analysis/standards Chemistry Techniques, Analytical/standards Dust/analysis Laboratories/statistics & numerical data Reference Standards Reproducibility of Results Volatile Organic Compounds/*analysis/standards;" |
| Notes: | "MedlineSu, Yushan Hung, Hayley eng Comparative Study Research Support, Non-U.S. Gov't England 2010/09/04 Environ Pollut. 2010 Nov; 158(11):3365-71. doi: 10.1016/j.envpol.2010.07.041" |
