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Volume 10, No. 5, October 2010, Pages 489-496 PDF(228 KB)  
doi: 10.4209/aaqr.2010.04.0028   

Gas/Particle Partitioning of Dioxins in Exhaust Gases from Automobiles

Shiunn-Cheng Chuang1, Shui-Jen Chen1, Kuo-Lin Huang1, Edward Ming-Yang Wu2, Guo-Ping Chang-Chien3, Lin-Chi Wang3

1 Department of Environmental Engineering and Science, National Pingtung University of Science and Technology, 1 Shieh-Fu Rd., Nei Pu 91207, Pingtung, Taiwan
2 Department of Civil and Ecological Engineering, I-Shou University. No.1, Sec. 1, Syuecheng Road, Dashu Township, Kaohsiung County, 840, Taiwan
3 Department of Chemical and Materials Engineering, and Super Micro Mass Research & Technology Center, Cheng Shiu University, Kaohsiung County 833, Taiwan




This study investigates distributions of polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran (PCDD/F) congeners in the exhaust gases of gasoline- and diesel-fueled vehicles. 6 sport utility vehicles (SUVs), 6 diesel passenger vehicles (DPVs), and 3 heavy duty diesel vehicle (HDDV) were examined using chassis dynamometer tests for measuring vehicular dioxin emissions. The mean PCDD/F I-TEQ emission factors were 0.101, 0.0688 and 0.912 ng I-TEQ/km for the SUVs, DPVs and HDDV, respectively. Highly chlorinated congeners dominated both gaseous and particulate phase PCDD/Fs. The major contributors of gas-phase PCDD/F I-TEQ for the SUVs, DPVs, and HDDV were 2,3,4,7,8-PeCDF, 2,3,7,8-TeCDD, and 2,3,4,7,8-PeCDF, respectively; however, 2,3,4,7,8-PeCDF was the major contributor in particulate-phase PCDD/F I-TEQ of these vehicles. The particulate-phase PCDD/Fs was responsible for 78.0, 90.3 and 71.1% of total PCDD/Fs for the SUVs, DPVs, and HDDV, respectively. Therefore, the control of particulate matter is more critical than that of gaseous pollutants for reducing PCDD/F emissions from automobiles.



Keywords: PCDD/Fs; Chassis dynamometer test; Sport utility vehicle; Diesel vehicle; Gas/Particle phase partitioning.



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