TY - JOUR
ID - 10.1016/j.jes.2021.01.034
TI - Variation characteristics of fine particulate matter and its components in diesel vehicle emission plumes
AU - Xianbao Shen
AU - Jiateng Hao
AU - Lei Kong
AU - Yue Shi
AU - Xinyue Cao
AU - Jiacheng Shi
AU - Zhiliang Yao
AU - Xin Li
AU - Bobo Wu
AU - Yiming Xu
AU - Kebin He
VL - 33
IS - 9
PB -
SP - 138
EP - 149
PY -
JF - Journal of Environmental Sciences
JA - J. Environ. Sci.
UR - http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=S1001074221000371&flag=1
KW - Corresponding author.;Variation characteristics;Diesel vehicle;Emission plume;2.5;Components
AB - A rapid reaction occurs near the exhaust nozzle when vehicle emissions contact the air. Twenty diesel vehicles were studied using a new multipoint sampling system that is suitable for studying the exhaust plume near the exhaust nozzle. The variation characteristics of fine particle matter (PM2.5) and its components in diesel vehicle exhaust plumes were analyzed. The PM2.5 emissions gradually increased with increasing distance from the nozzle in the plume. Elemental carbon emissions remained basically unchanged, organic carbon and total carbon (TC) increased with increasing distance. The concentrations of SO42−, NO3− and NH4+ (SNA) directly emitted by the vehicles were very low but increased rapidly in the exhaust plume. The selective catalytic reduction (SCR) reduced 42.7% TC, 40% NO3− emissions, but increased 104% SO42− and 36% NH4+ emissions, respectively. In summary, the SCR reduced 29% primary PM2.5 emissions for the tested diesel vehicles. The NH4NO3 particle formation maybe more important in the plume, and there maybe other forms of formation of NH4+ (eg. NH4Cl). The generation of secondary organic carbon (SOC) plays a leading role in the generation of secondary PM2.5. The SCR enhanced the formation of SOC and SNA in the plume, but comprehensive analysis shows that the SCR more enhanced the SNA formation in the plume, which is mainly new particles formation process. The inconsistency between secondary organic aerosol (SOA) and primary organic aerosol definitions is one of the important reasons for the difference between SOA simulation and observation.
ER -