TY - JOUR
T1 - Characterization of particulate-bound polycyclic aromatic compounds (PACs) and their oxidations in heavy polluted atmosphere
T2 - A case study in urban Beijing, China during haze events
AU - Li, Li Juan
AU - Ho, Steven Sai Hang
AU - Feng, Baihuan
AU - Xu, Hongbing
AU - Wang, Tong
AU - Wu, Rongshan
AU - Huang, Wei
AU - Qu, Linli
AU - Wang, Qiyuan
AU - Cao, Junji
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/4/10
Y1 - 2019/4/10
N2 - Characterizations on polycyclic aromatic compounds (PACs) during frequent haze periods have been conducted in an urban site of Beijing, China. Particulate polycyclic aromatic hydrocarbons (PAHs) and oxygenated-PAHs (OPAHs) and other carbonaceous matters were quantified. The average PM 2.5 during haze events (256.3 ± 103.7 μg/m 3 ) were one magnitude over than that of clear periods (CRs, 24.7 ± 27.7 μg/m 3 ).The average total quantified PAHs (ΣPAHs) and OPAHs (ΣOPAHs) during haze events were 423.9 ± 178.4 ng/m 3 and 581.4 ± 299.8 ng/m 3 , respectively, which were approximately 10 times higher than those of 40.3 ± 68.2 ng/m 3 and 54.4 ± 82.4 ng/m 3 in clear days. Four-rings PAHs had the highest compositions. 1,8-Naphthalic anhydride (1,8-NA) is the most abundant OPAHs, accounted for 49.8% of ∑OPAHs, followed by 9,10-anthraquinone (9,10-AQ) (13.8%) and benzo(a)anthracene-7,12-dione (BaAQ) (8.31%). In haze events, the contents of 5- to 7-rings PAHs decreased by 2.32% compared with those of clear days, while lower molecular weight fractions of 3- and 4-rings PAHs increased. The relationships between PAHs, OPAHs and relative humidity (RH) were found to be exponential. High oxygenation rate (R 0 ) ratios of OPAH/PAH represents higher rates in secondary formation or degradation and gas- particle conversion for each PAH or OPAH during the wintertime. Significant positive correlation between BeP and OPAHs (r = 0.97), combined with the results of photochemical aging and negatively correlation with O 3 , suggest that secondary atmospheric reactions of PAHs played an important role in the burden of OPAHs.
AB - Characterizations on polycyclic aromatic compounds (PACs) during frequent haze periods have been conducted in an urban site of Beijing, China. Particulate polycyclic aromatic hydrocarbons (PAHs) and oxygenated-PAHs (OPAHs) and other carbonaceous matters were quantified. The average PM 2.5 during haze events (256.3 ± 103.7 μg/m 3 ) were one magnitude over than that of clear periods (CRs, 24.7 ± 27.7 μg/m 3 ).The average total quantified PAHs (ΣPAHs) and OPAHs (ΣOPAHs) during haze events were 423.9 ± 178.4 ng/m 3 and 581.4 ± 299.8 ng/m 3 , respectively, which were approximately 10 times higher than those of 40.3 ± 68.2 ng/m 3 and 54.4 ± 82.4 ng/m 3 in clear days. Four-rings PAHs had the highest compositions. 1,8-Naphthalic anhydride (1,8-NA) is the most abundant OPAHs, accounted for 49.8% of ∑OPAHs, followed by 9,10-anthraquinone (9,10-AQ) (13.8%) and benzo(a)anthracene-7,12-dione (BaAQ) (8.31%). In haze events, the contents of 5- to 7-rings PAHs decreased by 2.32% compared with those of clear days, while lower molecular weight fractions of 3- and 4-rings PAHs increased. The relationships between PAHs, OPAHs and relative humidity (RH) were found to be exponential. High oxygenation rate (R 0 ) ratios of OPAH/PAH represents higher rates in secondary formation or degradation and gas- particle conversion for each PAH or OPAH during the wintertime. Significant positive correlation between BeP and OPAHs (r = 0.97), combined with the results of photochemical aging and negatively correlation with O 3 , suggest that secondary atmospheric reactions of PAHs played an important role in the burden of OPAHs.
KW - Haze
KW - Oxygenated PAHs
KW - Oxygenation rate
KW - PAHs
KW - PM
KW - Secondary organic formation
UR - https://www.scopus.com/pages/publications/85060127901
U2 - 10.1016/j.scitotenv.2019.01.078
DO - 10.1016/j.scitotenv.2019.01.078
M3 - 文章
C2 - 30743933
AN - SCOPUS:85060127901
SN - 0048-9697
VL - 660
SP - 1392
EP - 1402
JO - Science of the Total Environment
JF - Science of the Total Environment
ER -