標題: Sampling and conditioning artifacts of PM2.5 in filter-based samplers
作者: Liu, Chun-Nan
Lin, Sih-Fan
Awasthi, Amit
Tsai, Chuen-Jinn
Wu, Yueh-Chuen
Chen, Chung-Fang
環境工程研究所
Institute of Environmental Engineering
關鍵字: PM2.5 artifacts;Evaporation loss;Teflon filter;TEOM-FDMS
公開日期: 1-三月-2014
摘要: Field studies were conducted at Taiwan National Chiao-Tung University (NCTU) campus to evaluate the evaporation loss of fine particles (PM2.5) collected by the multi-filter PM10-PM2.5 sampler (MFPPS), which was collocated with a dichotomous sampler (Dichot, Andersen, Model SA-241), a WINS PM2.5 sampler (Thermo, Model 2000-FRM), and a tapered element oscillating microbalance with the filter dynamic measurement system (TEOM-FDMS, Thermo, Model 1405-DF). Porous-metal denuder samplers (PDSs) were installed in sampling channels of the MFPPS to measure the concentration of evaporated ion species. Results showed that the evaporation loss in PM2.5 was severe during sampling, accounting for 5.8-36.0% of the corrected PM2.5 concentration and the percentage increased with decreasing loaded particle mass and increasing filtration velocity. During 24-h sampling, the evaporated NH4+, NO3- and Cl- concentrations accounted for 9.5 +/- 6.2, 5.4 +/- 3.7, and 2.0 +/- 1.3% in corrected PM(2.)5 concentration, respectively, or 46.4 +/- 19.2, 66.9 +/- 18.5, and 74.4 +/- 14.0% in the concentration of each species, respectively. Due to the evaporation loss, PM2.5 concentrations measured by the WINS, Dichot, and MFPPS were lower than those the TEOM-FDMS by 16.6 +/- 9.0, 15.2 +/- 10.6 and 12.5 +/- 8.8%, respectively. When the MFPPS PM(2.)5 concentrations were corrected for the evaporated loss determined by the PDS, good agreement with those by the TEOM-FDMS was achieved. (C) 2013 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.atmosenv.2013.11.075
http://hdl.handle.net/11536/23767
ISSN: 1352-2310
DOI: 10.1016/j.atmosenv.2013.11.075
期刊: ATMOSPHERIC ENVIRONMENT
Volume: 85
Issue: 
起始頁: 48
結束頁: 53
顯示於類別:期刊論文


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