Characteristics and Sources of Heavy Metals in PM2.5 during a Typical Haze Episode in Rural and Urban Areas in Taiyuan, China
Autor: | Liyuan Cao, Kankan Liu, Ping Song, Changyuan Wan, Qingmin Shang, Chanyuan Ma |
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Rok vydání: | 2017 |
Předmět: |
Road dust
Atmospheric Science Haze 010504 meteorology & atmospheric sciences Coal combustion products rural area PM2.5 lcsh:QC851-999 010501 environmental sciences Environmental Science (miscellaneous) Urban area 01 natural sciences heavy metals haze Taiyuan Air quality index 0105 earth and related environmental sciences geography geography.geographical_feature_category Heavy metals Environmental chemistry Environmental science lcsh:Meteorology. Climatology Rural area Dust emission |
Zdroj: | Atmosphere, Vol 9, Iss 1, p 2 (2017) Atmosphere; Volume 9; Issue 1; Pages: 2 |
ISSN: | 2073-4433 |
Popis: | PM2.5 samples were collected in the rural and urban areas of Taiyuan, China during a typical haze episode and the heavy metals (Cr, Mn, Ni, Cu, Zn, As, Cd and Pb) in PM2.5 were analyzed. The haze was characterized by start-up stage with a daily mean PM2.5 of 149.34 ± 52.33 and 146.73 ± 18.96 μg m−3 in the rural and urban sites, respectively, a peak stage (288.20 ± 12.43 and 323.44 ± 5.23 μg m−3), and a weakening stage (226.59 ± 12.43 and 195.60 ± 2.93 μg m−3). The concentrations of PM2.5 in the rural and urban sites in the peak stage were 5.9 and 5.5 times higher than those in the normal stage, respectively. The order of concentrations of heavy metals in PM2.5 at the rural and urban sites were the same and are listed as follows: Zn > Pb > Mn > Cr > Cu > Ni > Cd > As. Pb at the rural site, As at the urban site, and Cd at the both sites failed to meet the air quality standard. The concentrations of Pb and Zn were higher at the rural site than those at the urban site. Principal component analysis indicated that the main sources of heavy metals for the rural area were raw coal combustion and soil/road dust, and for the urban area were coal combustion/industrial emissions, road/soil dust, and vehicle emissions/oil combustion. |
Databáze: | OpenAIRE |
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