TY - JOUR
T1 - Chemical characteristics of PM2.5 during dust storms and air pollution events in Chengdu, China
AU - Wang, Qiyuan
AU - Cao, Junji
AU - Shen, Zhenxing
AU - Tao, Jun
AU - Xiao, Shun
AU - Luo, Lei
AU - He, Qingyang
AU - Tang, Xinying
PY - 2013/2
Y1 - 2013/2
N2 - Daily fine particulate (PM2.5) samples were collected in Chengdu from April 2009 to February 2010 to investigate their chemical profiles during dust storms (DSs) and several types of pollution events, including haze (HDs), biomass burning (BBs), and fireworks displays (FDs). The highest PM 2.5 mass concentrations were found during DSs (283.3 μg/m 3), followed by FDs (212.7 μg/m3), HDs (187.3 μg/m3), and BBs (130.1 μg/m3). The concentrations of most elements were elevated during DSs and pollution events, except for BBs. Secondary inorganic ions (NO3-, SO4 2-, and NH4+) were enriched during HDs, while PM2.5 from BBs showed high K+ but low SO4 2-. FDs caused increases in K+ and enrichment in SO 42-. Ca2+ was abundant in DS samples. Ion-balance calculations indicated that PM2.5 from HDs and FDs was more acidic than on normal days, but DS and BB particles were alkaline. The highest organic carbon (OC) concentration was 26.1 μg/m3 during FDs, followed by BBs (23.6 μg/m3), HDs (19.6 μg/m3), and DSs (18.8 μg/m3). In contrast, elemental carbon (EC) concentration was more abundant during HDs (10.6 μg/m3) and FDs (9.5 μg/m3) than during BBs (6.2 μg/m3) and DSs (6.0 μg/m3). The highest OC/EC ratios were obtained during BBs, with the lowest during HDs. SO42-/K+ and TCA/SO 42- ratios proved to be effective indicators for differentiating pollution events. Mass balance showed that organic matter, SO42-, and NO3- were the dominant chemical components during pollution events, while soil dust was dominant during DSs.
AB - Daily fine particulate (PM2.5) samples were collected in Chengdu from April 2009 to February 2010 to investigate their chemical profiles during dust storms (DSs) and several types of pollution events, including haze (HDs), biomass burning (BBs), and fireworks displays (FDs). The highest PM 2.5 mass concentrations were found during DSs (283.3 μg/m 3), followed by FDs (212.7 μg/m3), HDs (187.3 μg/m3), and BBs (130.1 μg/m3). The concentrations of most elements were elevated during DSs and pollution events, except for BBs. Secondary inorganic ions (NO3-, SO4 2-, and NH4+) were enriched during HDs, while PM2.5 from BBs showed high K+ but low SO4 2-. FDs caused increases in K+ and enrichment in SO 42-. Ca2+ was abundant in DS samples. Ion-balance calculations indicated that PM2.5 from HDs and FDs was more acidic than on normal days, but DS and BB particles were alkaline. The highest organic carbon (OC) concentration was 26.1 μg/m3 during FDs, followed by BBs (23.6 μg/m3), HDs (19.6 μg/m3), and DSs (18.8 μg/m3). In contrast, elemental carbon (EC) concentration was more abundant during HDs (10.6 μg/m3) and FDs (9.5 μg/m3) than during BBs (6.2 μg/m3) and DSs (6.0 μg/m3). The highest OC/EC ratios were obtained during BBs, with the lowest during HDs. SO42-/K+ and TCA/SO 42- ratios proved to be effective indicators for differentiating pollution events. Mass balance showed that organic matter, SO42-, and NO3- were the dominant chemical components during pollution events, while soil dust was dominant during DSs.
KW - Chemical species
KW - Mass balance
KW - PM
KW - Pollution events
UR - https://www.scopus.com/pages/publications/84873727818
U2 - 10.1016/j.partic.2012.08.001
DO - 10.1016/j.partic.2012.08.001
M3 - 文章
AN - SCOPUS:84873727818
SN - 1674-2001
VL - 11
SP - 70
EP - 77
JO - Particuology
JF - Particuology
IS - 1
ER -