Gas/Particle Partitioning of Dioxins in Exhaust Gases from Automobiles

Received: September 30, 2010
Revised: September 30, 2010
Accepted: September 30, 2010
Download Citation: RIS|BibTeX|https://doi.org/10.4209/aaqr.2010.04.0028  

Cite this article:
Chuang, S.C., Chen, S.J., Huang, K.L., Wu, E.M.Y., Chang-Chien, G.P. and Wang, L.C. (2010). Gas/Particle Partitioning of Dioxins in Exhaust Gases from Automobiles. Aerosol Air Qual. Res. 10: 489-496. https://doi.org/10.4209/aaqr.2010.04.0028

ABSTRACT

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