TY - JOUR
T1 - Polycyclic aromatic hydrocarbons in the atmosphere of Shanghai, China
AU - Chen, Yingjun
AU - Feng, Yanli
AU - Xiong, Shengchun
AU - Liu, Dongyan
AU - Wang, Gang
AU - Sheng, Guoying
AU - Fu, Jiamo
PY - 2011/1
Y1 - 2011/1
N2 - Shanghai is the largest industrial and commercial city in China, and its air quality has been concerned for several years. However, scarce study had been made on the seasonal levels of atmospheric polycyclic aromatic hydrocarbons (PAHs), together with their gas-particle partitioning and potential emission sources. Based on an intensive sampling campaign at urban and suburban areas in Shanghai during four seasons of 2005-2006, this study presented the measurement of PAH concentrations in both particulate and gaseous phases, as well as seasonal and spatial variability. The results showed that the annual PAH levels (gas + particle) were 167±109 ng m∈-∈3 at the urban site and 216±86.5 ng m∈-∈3 at the suburban site. Gaseous PAHs (>70%) dominated the total PAH mass at both sites, while particulate PAHs contributed more than 90% of the toxic power according to benzo(a)pyrene-equivalent carcinogenic parameter. Different seasonal trend of PAH concentrations was observed between the two sites, and it may be explained by complicated factors such as sampling heights, local/regional emission sources, and climatic conditions. The gas-particle partitioning of PAHs in all samples was calculated, and strong linear correlations between log K p and log P-{\rm L}{\,\,\,\rm o} were observed, with shallower slopes (m r) at the suburban site than the urban one and in warm season than the cold months, indicating the different equilibrium conditions of PAHs in spatial and seasonal scales in Shanghai. The slope (m r∈= ∈-∈0.96) and correlation coefficient (R 2∈=∈0.81) for four-ring PAHs were closest to theoretical equilibrium conditions among compounds with various aromatic rings. Finally, the potential PAH sources were estimated based on principal factor analysis with multiple linear regressions. Ground volatilization dominated the PAH pollutions at both sites, while vehicles and coal consumption were the other main emission sources, which totally contributed 32.0% (suburban) to 49.2% (urban) of PAH mass in Shanghai atmosphere. The effects of wood and biomass burning were also detected, but their contributions to PAHs were negligible.
AB - Shanghai is the largest industrial and commercial city in China, and its air quality has been concerned for several years. However, scarce study had been made on the seasonal levels of atmospheric polycyclic aromatic hydrocarbons (PAHs), together with their gas-particle partitioning and potential emission sources. Based on an intensive sampling campaign at urban and suburban areas in Shanghai during four seasons of 2005-2006, this study presented the measurement of PAH concentrations in both particulate and gaseous phases, as well as seasonal and spatial variability. The results showed that the annual PAH levels (gas + particle) were 167±109 ng m∈-∈3 at the urban site and 216±86.5 ng m∈-∈3 at the suburban site. Gaseous PAHs (>70%) dominated the total PAH mass at both sites, while particulate PAHs contributed more than 90% of the toxic power according to benzo(a)pyrene-equivalent carcinogenic parameter. Different seasonal trend of PAH concentrations was observed between the two sites, and it may be explained by complicated factors such as sampling heights, local/regional emission sources, and climatic conditions. The gas-particle partitioning of PAHs in all samples was calculated, and strong linear correlations between log K p and log P-{\rm L}{\,\,\,\rm o} were observed, with shallower slopes (m r) at the suburban site than the urban one and in warm season than the cold months, indicating the different equilibrium conditions of PAHs in spatial and seasonal scales in Shanghai. The slope (m r∈= ∈-∈0.96) and correlation coefficient (R 2∈=∈0.81) for four-ring PAHs were closest to theoretical equilibrium conditions among compounds with various aromatic rings. Finally, the potential PAH sources were estimated based on principal factor analysis with multiple linear regressions. Ground volatilization dominated the PAH pollutions at both sites, while vehicles and coal consumption were the other main emission sources, which totally contributed 32.0% (suburban) to 49.2% (urban) of PAH mass in Shanghai atmosphere. The effects of wood and biomass burning were also detected, but their contributions to PAHs were negligible.
KW - Concentration
KW - Gas-particle partitioning
KW - PAHs
KW - Seasonal trends
KW - Shanghai
KW - Source apportionment
UR - https://www.scopus.com/pages/publications/79251599420
U2 - 10.1007/s10661-010-1330-x
DO - 10.1007/s10661-010-1330-x
M3 - 文章
C2 - 20145995
AN - SCOPUS:79251599420
SN - 0167-6369
VL - 172
SP - 235
EP - 247
JO - Environmental Monitoring and Assessment
JF - Environmental Monitoring and Assessment
IS - 1-4
ER -
