Journal
ATMOSPHERIC POLLUTION RESEARCH
Volume 12, Issue 9, Pages -Publisher
TURKISH NATL COMMITTEE AIR POLLUTION RES & CONTROL-TUNCAP
DOI: 10.1016/j.apr.2021.101169
Keywords
PM; OC/EC; PAHs; Vehicle exhaust
Categories
Funding
- Research Grants Council of HKSAR, China [UGC/FDS/25/E01/18]
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This study found that using a biodiesel blend (B5) in diesel vehicles increased the emission of OC and total PAHs EFs, while also promoting the release of more toxic PAHs with higher molecular weight.
This study investigates the particle emissions from a diesel vehicle fueled with ultralow sulphur diesel (B0, ULSD) and 5 % biodiesel blend (B5) by a chassis dynamometer test under three driving conditions. Elemental carbon (EC), organic carbon (OC), 30 species of polycyclic aromatic hydrocarbon (PAH) and 10 species of oxygenated PAH (oxy-PAH) were analyzed to quantify the chemical compositions of the collected particulate matter (PM). The emission factors (EFs) of OC were increased with B5 by a range between 39.5 % and 113.7 %, compared with B0. Both fuel blends recorded a trace amount of EC (0.25 mg/kg or less). It was found that the B5 EFs of total PAHs were decreased by a range between 15.2 % and 50.2 % relative to B0. 2-to 3-ring species, the dominant PAHs and oxy-PAHs, were decreased substantially when using B5. However, the results showed that biodiesel blend promoted the emission of 4-and 5-ring oxy-PAHs and 5-to 7-ring PAHs. The application of B5 shifted the composition towards a higher proportion of PAHs with higher molecular weight and more oxy-PAHs. Due to the increased emissions in PAHs with higher toxic equivalent factors (TEFs), the application of B5 resulted in an increase in toxicity expressed in BAPeq range from 11.3 % to 117.0 %.
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